Nanotubes. Medical search

Nanometer-sized tubes composed mainly of CARBON. Such nanotubes are used as probes for high-resolution structural and chemical imaging of biomolecules with ATOMIC FORCE MICROSCOPY.

Nanometer-sized tubes composed of various substances including carbon (CARBON NANOTUBES), boron nitride, or nickel vanadate.

NANOTUBES formed from cyclic peptides (PEPTIDES, CYCLIC). Alternating D and L linkages create planar rings that self assemble by stacking into nanotubes. They can form pores through CELL MEMBRANE causing damage to cells.

The development and use of techniques to study physical phenomena and construct structures in the nanoscale size range or smaller.

An allotropic form of carbon that is used in pencils, as a lubricant, and in matches and explosives. It is obtained by mining and its dust can cause lung irritation.

A polyhedral CARBON structure composed of around 60-80 carbon atoms in pentagon and hexagon configuration. They are named after Buckminster Fuller because of structural resemblance to geodesic domes. Fullerenes can be made in high temperature such as arc discharge in an inert atmosphere.

Nanometer-scale composite structures composed of organic molecules intimately incorporated with inorganic molecules. (Glossary of Biotechnology and Nanobiotechology Terms, 4th ed)

Materials which have structured components with at least one dimension in the range of 1 to 100 nanometers. These include NANOCOMPOSITES; NANOPARTICLES; NANOTUBES; and NANOWIRES.

A dark powdery deposit of unburned fuel residues, composed mainly of amorphous CARBON and some HYDROCARBONS, that accumulates in chimneys, automobile mufflers and other surfaces exposed to smoke. It is the product of incomplete combustion of carbon-rich organic fuels in low oxygen conditions. It is sometimes called lampblack or carbon black and is used in INK, in rubber tires, and to prepare CARBON NANOTUBES.

Any of a variety of procedures which use biomolecular probes to measure the presence or concentration of biological molecules, biological structures, microorganisms, etc., by translating a biochemical interaction at the probe surface into a quantifiable physical signal.

Electron microscopy in which the ELECTRONS or their reaction products that pass down through the specimen are imaged below the plane of the specimen.

Analysis of the intensity of Raman scattering of monochromatic light as a function of frequency of the scattered light.

Technique whereby the weight of a sample can be followed over a period of time while its temperature is being changed (usually increased at a constant rate).

Microscopy in which the object is examined directly by an electron beam scanning the specimen point-by-point. The image is constructed by detecting the products of specimen interactions that are projected above the plane of the sample, such as backscattered electrons. Although SCANNING TRANSMISSION ELECTRON MICROSCOPY also scans the specimen point by point with the electron beam, the image is constructed by detecting the electrons, or their interaction products that are transmitted through the sample plane, so that is a form of TRANSMISSION ELECTRON MICROSCOPY.

The branch of medicine concerned with the application of NANOTECHNOLOGY to the prevention and treatment of disease. It involves the monitoring, repair, construction, and control of human biological systems at the molecular level, using engineered nanodevices and NANOSTRUCTURES. (From Freitas Jr., Nanomedicine, vol 1, 1999).

Electric conductors through which electric currents enter or leave a medium, whether it be an electrolytic solution, solid, molten mass, gas, or vacuum.

The testing of materials and devices, especially those used for PROSTHESES AND IMPLANTS; SUTURES; TISSUE ADHESIVES; etc., for hardness, strength, durability, safety, efficacy, and biocompatibility.

Relating to the size of solids.

Materials that have a limited and usually variable electrical conductivity. They are particularly useful for the production of solid-state electronic devices.

Determination of the quantity of a material present in a mixture by measurement of its effect on the electrical conductivity of the mixture. (Webster, 3d ed)

The adhesion of gases, liquids, or dissolved solids onto a surface. It includes adsorptive phenomena of bacteria and viruses onto surfaces as well. ABSORPTION into the substance may follow but not necessarily.

A nonmetallic element with atomic symbol C, atomic number 6, and atomic weight [12.0096; 12.0116]. It may occur as several different allotropes including DIAMOND; CHARCOAL; and GRAPHITE; and as SOOT from incompletely burned fuel.

The study of chemical changes resulting from electrical action and electrical activity resulting from chemical changes.

Nanoparticles produced from metals whose uses include biosensors, optics, and catalysts. In biomedical applications the particles frequently involve the noble metals, especially gold and silver.

Characteristics or attributes of the outer boundaries of objects, including molecules.

The utilization of an electrical current to measure, analyze, or alter chemicals or chemical reactions in solution, cells, or tissues.

A dark-gray, metallic element of widespread distribution but occurring in small amounts; atomic number, 22; atomic weight, 47.90; symbol, Ti; specific gravity, 4.5; used for fixation of fractures. (Dorland, 28th ed)

Nanometer-scale wires made of materials that conduct electricity. They can be coated with molecules such as antibodies that will bind to proteins and other substances.

Specialized structures of the cell that extend the cell membrane and project out from the cell surface.

Enzymes which are immobilized on or in a variety of water-soluble or water-insoluble matrices with little or no loss of their catalytic activity. Since they can be reused continuously, immobilized enzymes have found wide application in the industrial, medical and research fields.

The properties and processes of materials that affect their behavior under force.

That portion of the electromagnetic spectrum usually sensed as heat. Infrared wavelengths are longer than those of visible light, extending into the microwave frequencies. They are used therapeutically as heat, and also to warm food in restaurants.

Histiocytic, inflammatory response to a foreign body. It consists of modified macrophages with multinucleated giant cells, in this case foreign-body giant cells (GIANT CELLS, FOREIGN-BODY), usually surrounded by lymphocytes.

Structures which are part of the CELL MEMBRANE or have cell membrane as a major part of their structure.

Alkaloids extracted from various species of Cinchona.

Synthetic or natural materials, other than DRUGS, that are used to replace or repair any body TISSUES or bodily function.

Electrical devices that are composed of semiconductor material, with at least three connections to an external electronic circuit. They are used to amplify electrical signals, detect signals, or as switches.

Substances used in biomedicine or dentistry predominantly for their physical, as opposed to chemical, properties.

Compounds formed by the joining of smaller, usually repeating, units linked by covalent bonds. These compounds often form large macromolecules (e.g., BIOPOLYMERS; PLASTICS).

A yellow metallic element with the atomic symbol Au, atomic number 79, and atomic weight 197. It is used in jewelry, goldplating of other metals, as currency, and in dental restoration. Many of its clinical applications, such as ANTIRHEUMATIC AGENTS, are in the form of its salts.

A spectroscopic technique in which a range of wavelengths is presented simultaneously with an interferometer and the spectrum is mathematically derived from the pattern thus obtained.

A type of scanning probe microscopy in which a probe systematically rides across the surface of a sample being scanned in a raster pattern. The vertical position is recorded as a spring attached to the probe rises and falls in response to peaks and valleys on the surface. These deflections produce a topographic map of the sample.

The study of ENVIRONMENTAL POLLUTION and the toxic effects of ENVIRONMENTAL POLLUTANTS on the ECOSYSTEM. The term was coined by Truhaut in 1969.

The exposure to potentially harmful chemical, physical, or biological agents by inhaling them.

Nanometer sized fragments of semiconductor crystalline material which emit PHOTONS. The wavelength is based on the quantum confinement size of the dot. They can be embedded in MICROBEADS for high throughput ANALYTICAL CHEMISTRY TECHNIQUES.

An isoform of DNA that occurs in an environment rich in SODIUM and POTASSIUM ions. It is a right-handed helix with 11 base pairs per turn, a pitch of 0.256 nm per base pair and a helical diameter of 2.3 nm.

Tree-like, highly branched, polymeric compounds. They grow three-dimensionally by the addition of shells of branched molecules to a central core. The overall globular shape and presence of cavities gives potential as drug carriers and CONTRAST AGENTS.

Agents that modify interfacial tension of water; usually substances that have one lipophilic and one hydrophilic group in the molecule; includes soaps, detergents, emulsifiers, dispersing and wetting agents, and several groups of antiseptics.

Systems for the delivery of drugs to target sites of pharmacological actions. Technologies employed include those concerning drug preparation, route of administration, site targeting, metabolism, and toxicity.

Hydrocarbons with more than one triple bond; or an oxidized form of POLYENES. They can react with SULFUR to form THIOPHENES.

Products or parts of products used to detect, manipulate, or analyze light, such as LENSES, refractors, mirrors, filters, prisms, and OPTICAL FIBERS.

A technique of measuring the dielectric properties of materials, which vary over a range of frequencies depending on the physical properties of the material. The technique involves measuring, over a range of frequencies, ELECTRICAL IMPEDANCE and phase shift of an electric field as it passes through the material.

Organic compounds that contain silicon as an integral part of the molecule.

A clear, odorless, tasteless liquid that is essential for most animal and plant life and is an excellent solvent for many substances. The chemical formula is hydrogen oxide (H2O). (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)

Hard, amorphous, brittle, inorganic, usually transparent, polymerous silicate of basic oxides, usually potassium or sodium. It is used in the form of hard sheets, vessels, tubing, fibers, ceramics, beads, etc.

Submicron-sized fibers with diameters typically between 50 and 500 nanometers. The very small dimension of these fibers can generate a high surface area to volume ratio, which makes them potential candidates for various biomedical and other applications.

The heat flow across a surface per unit area per unit time, divided by the negative of the rate of change of temperature with distance in a direction perpendicular to the surface. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)

Selective cell targeting with light-absorbing microparticles and nanoparticles. (1/401)

We describe a new method for selective cell targeting based on the use of light-absorbing microparticles and nanoparticles that are heated by short laser pulses to create highly localized cell damage. The method is closely related to chromophore-assisted laser inactivation and photodynamic therapy, but is driven solely by light absorption, without the need for photochemical intermediates (particularly singlet oxygen). The mechanism of light-particle interaction was investigated by nanosecond time-resolved microscopy and by thermal modeling. The extent of light-induced damage was investigated by cell lethality, by cell membrane permeability, and by protein inactivation. Strong particle size dependence was found for these interactions. A technique based on light to target endogenous particles is already being exploited to treat pigmented cells in dermatology and ophthalmology. With exogenous particles, phamacokinetics and biodistribution studies are needed before the method can be evaluated against photodynamic therapy for cancer treatment. However, particles are unique, unlike photosensitizers, in that they can remain stable and inert in cells for extended periods. Thus they may be particularly useful for prelabeling cells in engineered tissue before implantation. Subsequent irradiation with laser pulses will allow control of the implanted cells (inactivation or modulation) in a noninvasive manner. (+info)

Self-assembly of single integral membrane proteins into soluble nanoscale phospholipid bilayers. (2/401)

One of the biggest challenges in pharmaceutical research is obtaining integral membrane proteins in a functional, solubilized, and monodisperse state that provides a native-like environment that maintains the spectrum of in vivo activities. Many of these integral membrane proteins are receptors, enzymes, or other macromolecular assemblies that are important drug targets. An example is the general class of proteins composed of seven-transmembrane segments (7-TM) as exemplified by the G-protein-coupled receptors. In this article, we describe a simple system for self-assembling bacteriorhodopsin, as a model protein containing 7-TM helices, with phospholipids to form a nanometer-scale soluble bilayer structure encircled by a 200 amino acid scaffold protein. The result is the single molecule incorporation of an integral membrane protein target into a soluble and monodisperse structure that allows the structural and functional tools of solution biochemistry to be applied. (+info)

DNA nanotubes self-assembled from triple-crossover tiles as templates for conductive nanowires. (3/401)

DNA-based nanotechnology is currently being developed as a general assembly method for nanopatterned materials that may find use in electronics, sensors, medicine, and many other fields. Here we present results on the construction and characterization of DNA nanotubes, a self-assembling superstructure composed of DNA tiles. Triple-crossover tiles modified with thiol-containing double-stranded DNA stems projected out of the tile plane were used as the basic building blocks. Triple-crossover nanotubes display a constant diameter of approximately 25 nm and have been observed with lengths up to 20 microm. We present high-resolution images of the constructs, experimental evidence of their tube-like nature as well as data on metallization of the nanotubes to form nanowires, and electrical conductivity measurements through the nanowires. DNA nanotubes represent a potential breakthrough in the self-assembly of nanometer-scale circuits for electronics layout because they can be targeted to connect at specific locations on larger-scale structures and can subsequently be metallized to form nanometer-scale wires. The dimensions of these nanotubes are also perfectly suited for applications involving interconnection of molecular-scale devices with macroscale components fabricated by conventional photolithographic methods. (+info)

Self-association process of a peptide in solution: from beta-sheet filaments to large embedded nanotubes. (4/401)

Lanreotide is a synthetic octapeptide used in the therapy against acromegaly. When mixed with pure water at 10% (w/w), Lanreotide (acetate salt) forms liquid crystalline and monodisperse nanotubes with a radius of 120 A. The molecular and supramolecular organization of these structures has been determined in a previous work as relying on the lateral association of 26 beta-sheet filaments made of peptide noncovalent dimers, the basic building blocks. The work presented here has been devoted to the corresponding self-association mechanisms, through the characterization of the Lanreotide structures formed in water, as a function of peptide (acetate salt) concentration (from 2% to 70% (w/w)) and temperature (from 15 degrees C to 70 degrees C). The corresponding states of water were also identified and quantified from the thermal behavior of water in the Lanreotide mixtures. At room temperature and below 3% (w/w) Lanreotide acetate in water, soluble aggregates were detected. From 3% to 20% (w/w) long individual and monodisperse nanotubes crystallized in a hexagonal lattice were evidenced. Their molecular and supramolecular organizations are identical to the ones characterized for the 10% (w/w) sample. Heating induces the dissolution of the nanotubes into soluble aggregates of the same structural characteristics as the room temperature ones. The solubilization temperature increases from 20 degrees C to 70 degrees C with the peptide concentration and reaches a plateau between 15% and 25% (w/w) in peptide. These aggregates are proposed to be the beta-sheet filaments that self-associate to build the walls of the nanotubes. Above 20% (w/w) of Lanreotide acetate in water, polydisperse embedded nanotubes are formed and the hexagonal lattice is lost. These embedded nanotubes exhibit the same molecular and supramolecular organizations as the individual monodisperse nanotubes formed at lower peptide concentration. The embedded nanotubes do not melt in the range of temperature studied indicating a higher thermodynamic stability than individual nanotubes. In parallel, the thermal behaviors of water in mixtures containing 2-80% (w/w) in peptide have been studied by differential scanning calorimetry, and three different types of water were characterized: 1), bulk water melting at 0 degrees C, 2), nonfreezing water, and 3), interfacial water melting below 0 degrees C. The domains of existence and coexistence of these different water states are related to the different Lanreotide supramolecular structures. All these results were compiled into a binary Lanreotide-water phase diagram and allowed to propose a self-association mechanism of Lanreotide filaments into monodisperse individual nanotubes and embedded nanotubes. (+info)

RNA-mediated metal-metal bond formation in the synthesis of hexagonal palladium nanoparticles. (5/401)

RNA sequences have been discovered that mediate the growth of hexagonal palladium nanoparticles. In vitro selection techniques were used to evolve an initial library of approximately 10(14) unique RNA sequences through eight cycles of selection to yield several active sequence families. Of the five families, all representative members could form crystalline hexagonal palladium platelets. The palladium particle growth occurred in aqueous solution at ambient temperature, without any endogenous reducing agent, and at low concentrations of metal precursor (100 micromolar). Relative to metal precursor, the RNA concentration was significantly lower (1 micromolar), yet micrometer-size crystalline hexagonal palladium particles were formed rapidly (7.5 to 1 minutes). (+info)

Tracking the recruitment of diabetogenic CD8+ T-cells to the pancreas in real time. (6/401)

Development of autoimmune diabetes in both humans and mice is preceded by a prolonged period of inflammation of pancreatic islets by autoreactive T-cells. Noninvasive imaging techniques, including positron-emission tomography and optical or magnetic resonance imaging, have been used to track the recruitment of lymphocytes to sites of inflammation. These techniques, however, rely on labeling strategies that are non-antigen specific and do not allow specific tracking of the recruitment of autoreactive lymphocytes. Here we describe an antigen-specific magnetic label to selectively target a prevalent population of diabetogenic CD8(+) T-cells that contribute to the progression of insulitis to overt diabetes in NOD mice. Superparamagnetic nanoparticles coated with multiple copies of a high-avidity peptide/major histocompatibility complex ligand of these T-cells (NRP-V7/K(d)) are endocytosed by CD8(+) T-cells in an antigen-specific manner. Using these T-cells as probes, we show that inflammation of pancreatic islets by autoreactive T-cells can be detected in real time by magnetic resonance imaging. This study demonstrates the feasibility of visualizing the presence of ongoing autoimmune responses noninvasively. (+info)

Preparation of DNA-modified nanoparticles and preliminary study for colorimetric SNP analysis using their selective aggregations. (7/401)

DNA-modified nanospheres were prepared by anchoring amino-terminated oligodeoxynucleotides (ODNs) with carboxylates onto a colored polystyrene sphere surface through amido bonds. About 220 ODN molecules were immobilized onto a nanosphere 40 nm in diameter. Preliminary studies using the microspheres with 1 microm diameter reveal that the specificity of hybridization was retained after modification. Three kinds of differently colored (RGB, red/green/blue) nanospheres bearing unique ODNs on their surface were prepared for detecting the p53 gene. Each ODN is complementary to a different part in the 45mer sample that is a part of a conservative region of the p53 gene containing one of the hot spots. In a binary system using spheres R and G, the wild-type 45mer made the aggregates with yellow emission as the result of mixing both colors. The mutant 45mer containing one nucleotide displacement did not give such aggregates with distinct colors. The study of fluorescence resonance energy transfer (FRET) showed that spheres R and G directly contact each other in the aggregates with the wild type. The RGB ternary system gave aggregates with specific colors corresponding to the added ODN samples, wild type or mutant. In addition, in the presence of both samples, all of the spheres formed aggregates with white emission as a consequence of mixing three primary colors of light. This means that the present technique should allow us to conduct an allele analysis. (+info)

Energetic clues to pathways to biomineralization: precursors, clusters, and nanoparticles. (8/401)

Nanoparticle and nanocluster precursors may play a major role in biomineralization. The small differences in enthalpy and free energy among metastable nanoscale phases offer controlled thermodynamic and mechanistic pathways. Clusters and nanoparticles offer concentration and controlled transport of reactants. Control of polymorphism, surface energy, and surface charge on nanoparticles can lead to morphological control and appropriate growth rates of biominerals. Rather than conventional nucleation and growth, assembly of nanoparticles may provide alternative mechanisms for crystal growth. The Ostwald step rule, based on a thermodynamic view of nucleation and growth, is supported by the observation that more metastable phases tend to have lower surface energies. Examples from nonbiological systems, stressing the interplay of thermodynamic and kinetic factors, illustrate features potentially important to biomineralization. (+info)

Symptoms: The symptoms of a foreign-body granuloma depend on the location and size of the foreign body, but may include redness, swelling, pain, and difficulty moving the affected area.

Causes and risk factors: A foreign body can enter the body through a variety of means, such as puncture wounds, lacerations, or surgical incisions. Risk factors for developing a foreign-body granuloma include poor hygiene, accidental injuries, and certain medical conditions that impair immune function.

Diagnosis: Diagnosis of a foreign-body granuloma is based on a combination of physical examination, imaging studies, such as X-rays or CT scans, and histopathology.

Treatment: Treatment of a foreign-body granuloma depends on the size and location of the foreign body, but may include surgical removal of the foreign body, antibiotics for any accompanying infections, and management of any complications. In some cases, no treatment may be necessary, and the granuloma may resolve on its own over time.

Prognosis: The prognosis for a foreign-body granuloma is generally good if the foreign body is removed promptly and there are no complications. However, if left untreated, the granuloma can become chronic and cause ongoing symptoms and discomfort. In rare cases, the granuloma may progress to more severe conditions, such as sepsis or tissue necrosis.

Prevention: Prevention of foreign-body granulomas involves good hygiene practices, such as washing hands regularly and avoiding contact with potential sources of infection. In high-risk individuals, such as those with compromised immune systems, it may be advisable to avoid certain activities or environments that could increase the risk of infection.

For a given (n,m) nanotube, if n = m, the nanotube is metallic; if n − m is a multiple of 3, then the nanotube is ... Thus all armchair (n=m) nanotubes are metallic, and nanotubes (5,0), (6,4), (9,1), etc. are semiconducting. Thus, some ... One had single wall nanotubes and the other multi wall nanotubes, however, plasma-polymerized thin films (PPFs) were ... Single-Wall Nanotube, Multi-Wall Nanotube, and Fullerene". Environmental Science & Technology. 39 (5): 1378-1383. Bibcode: ...

https://en.wikipedia.org/wiki/Carbon_nanotubes_in_medicine

Capacitance of nanotubes consists of quantum, Cq and electrostatic capacitance Ce. For multi-wall carbon nanotubes, there is ... In nanotechnology, carbon nanotube interconnects refer to the proposed use of carbon nanotubes in the interconnects between the ... The resistance R of one single-walled carbon nanotubes can be expressed by R = R c + R q ( 1 + L / L m f p ) {\displaystyle R=R ... The shell resistance of an individual nanotube can be obtained by computing the resistance of each shell as R s h e l l = R i ...

https://en.wikipedia.org/wiki/Carbon_nanotubes_in_interconnects

March - Nanotubes used as a scaffold for damaged nerve regeneration. May - Method of placing nanotube accurately is developed ... April - Nanotubes incorporated in virus battery. A single-walled carbon nanotube was grown by chemical vapor deposition across ... Simonite, Tom (27 June 2006). "Gadget sorts nanotubes by size". New Scientist. "Carbon nanotubes enter Tour de France". 7 July ... June - Gadget invented by Rice University that can sort nanotubes by size and electrical properties. July - Nanotubes were ...

https://en.wikipedia.org/wiki/Timeline_of_carbon_nanotubes

The catalyst particles can stay at the tips of the growing nanotube during growth, or remain at the nanotube base, depending on ... When they heard of the existence of nanotubes they replaced the metals with graphite to create multi-walled carbon nanotubes. ... and because CVD is capable of growing nanotubes directly on a desired substrate, whereas the nanotubes must be collected in the ... developed a process to grow aligned carbon nanotube arrays of length 18 mm on a FirstNano ET3000 carbon nanotube growth system ...

https://en.wikipedia.org/wiki/Synthesis_of_carbon_nanotubes

Multiple research investigations with both multi-walled carbon nanotubes (MWCNTs) and single-walled carbon nanotubes (SWCNTs) ... Renewable energy portal Energy portal Optical properties of carbon nanotubes Carbon nanotube Selective chemistry of single- ... Acid infiltration of nanotube networks significantly boosts the cell efficiency to 13.8%,as reported by Yi Jia, by reducing the ... Additionally aligned nanotube film has much smaller void space, and better contact with substrate. So, plus strong acid doping ...

https://en.wikipedia.org/wiki/Carbon_nanotubes_in_photovoltaics

... a nanotube of gallium nitride Silicon nanotube, made of silicon atoms Non-carbon nanotube, especially tungsten(IV) sulfide ... and nitrogen atoms Boron nitride nanotube, a polymorph of boron nitride Carbon nanotube, includes general nanotube terminology ... A nanotube is a nanometer-scale hollow tube-like structure. BCN nanotube, composed of comparable amounts of boron, carbon, ... nanotubes Tunneling nanotube, a tubular membrane connection between cells Titanium nanotubes, created by the conversion of the ...

https://en.wikipedia.org/wiki/Nanotube

Mixed nanotube membranes such as double-walled-nanotubes/polyacrylate have a flux of about 4.05 LMH/bar, 1.5 times greater than ... Single-walled nanotubes tend to exhibit more antimicrobial behavior than multi-walled and double-walled nanotubes and inhibits ... Ions are excluded by functionalizing the ends of the nanotubes, as well as by tube diameter. While the carbon nanotubes are non ... The inner diameter of the nanotube largely contributes to the ion exclusion properties of the nanotube. As shown below, an ...

https://en.wikipedia.org/wiki/Carbon_nanotubes_for_water_transport

Carbon nanotubes (CNTs) are cylinders of one or more layers of graphene (lattice). Diameters of single-walled carbon nanotubes ... Nanotube-based transistors, also known as carbon nanotube field-effect transistors (CNTFETs), have been made that operate at ... "Super-nanotubes: 'remarkable' spray-on coating combines carbon nanotubes with ceramic". KurzweilAI. Bhandavat, R.; Feldman, A ... Printable water-based inks of carbon nanotubes are desired to enable the production of these films to replace ITO. Nanotube ...

https://en.wikipedia.org/wiki/Potential_applications_of_carbon_nanotubes

Carbon nanotubes (CNTs) are long hollow cylinders of graphene. Although graphene sheets have 2D symmetry, carbon nanotubes by ... Multi-walled nanotubes are multiple concentric nanotubes precisely nested within one another. These exhibit a striking ... 60 GPa for multi-walled carbon nanotubes and ≈17 GPa for double-walled carbon nanotube bundles. CNTs are not nearly as strong ... Since carbon nanotubes have a low density for a solid of 1.3 to 1.4 g/cm3, its specific strength of up to 48,000 kN·m·kg−1 is ...

https://en.wikipedia.org/wiki/Mechanical_properties_of_carbon_nanotubes

Interaction between nanotubes or between a nanotube and another material may quench or increase PL. No PL is observed in multi- ... High-quality nanotubes have this ratio significantly higher than 100. At a lower functionalisation of the nanotube, the G/D ... A Kataura plot relates the nanotube diameter and its bandgap energies for all nanotubes in a diameter range. The oscillating ... Allotropes of carbon Buckypaper Carbon nanotube Carbon nanotubes in photovoltaics Graphene Hiromichi Kataura Mechanical ...

https://en.wikipedia.org/wiki/Optical_properties_of_carbon_nanotubes

A phenine nanotube is a derivation or variant of short carbon nanotubes first reported in 2019. They have a precise cylindrical ... v t e (All stub articles, Chemistry stubs, Carbon nanotubes). ...

https://en.wikipedia.org/wiki/Phenine_nanotube

... s are either a single, open-ended nanotube(CNT) or a film composed of an array of nanotubes that are oriented ... It was shown that water can pass through the graphitic nanotube cores of the membrane at up to five magnitudes greater than ... Fluids and gas molecules may pass through the membrane en masse but only through the nanotubes. For instance, water molecules ... This results in an almost frictionless or atomically smooth interface between the nanotubes and water which relate to a "slip ...

https://en.wikipedia.org/wiki/Nanotube_membrane

Single-walled B-C-N nanotubes have been made with a hot-filament method. Vertically aligned arrays of ~BC2N nanotubes can be ... BCN nanotubes are tubular structures with a sub-micrometer diameter and a length much longer than diameter. They are composed ... Another method produced nanotubes of composition : B45%,C31%,N24% The method was grow them on stainless steel by reacting boron ... The vertically-aligned BCN nanotubes (made as above) exhibit a high and stable specific capacitance (>500 F/g), which exceeds ...

https://en.wikipedia.org/wiki/BCN_nanotube

A tunneling nanotube (TNT) or membrane nanotube is a term that has been applied to protrusions that extend from the plasma ... Vesicular transport in membrane nanotubes has been modeled utilizing a continuum approach. A variety of synthetic nanotubes, ... Tunneling nanotubes have been implicated as one mechanism by which whole mitochondria can be transferred from cell to cell. ... February 2008). "Membrane nanotubes physically connect T cells over long distances presenting a novel route for HIV-1 ...

https://en.wikipedia.org/wiki/Tunneling_nanotube

The first reports on silicon nanotubes appeared around the year 2000. One method to prepare silicon nanotubes is using a ... Silicon nanotubes are nanoparticles which create a tube-like structure from silicon atoms. As with silicon nanowires, they are ... A silicon nanotube charged with hydrogen delivers energy and in the process leaves residual water, ethanol, silicon and sand. ... Silicon nanotubes and silicon nanowires can be used in lithium-ion batteries. Conventional Li-ion batteries use graphitic ...

https://en.wikipedia.org/wiki/Silicon_nanotube

For a given (n,m) nanotube, if n = m, the nanotube is metallic; if n − m is a multiple of 3 and n ≠ m, then the nanotube is ... This nanotube was grown inside a multi-walled carbon nanotube. Assigning of the carbon nanotube type was done by a combination ... Multi-wall carbon nanotubes are also sometimes used to refer to double- and triple-wall carbon nanotubes. Carbon nanotubes can ... Thus, all armchair (n = m) nanotubes are metallic, and nanotubes (6,4), (9,1), etc. are semiconducting. Carbon nanotubes are ...

https://en.wikipedia.org/wiki/Carbon_nanotube

Nanotubes with n - m = 3i (i is an integer) are all metals and rest are all semiconducting (SC). Carbon nanotubes are metallic ... Nanotubes reacted with the diazonium reagent can be converted back into pristine nanotubes when thermally treated at 300 °C in ... Selective chemistry of single-walled nanotubes is a field in Carbon nanotube chemistry devoted specifically to the study of ... In comparison with fullerene molecules single-walled nanotubes (SWNTs) are moderately curved. Consequently, nanotubes are ...

https://en.wikipedia.org/wiki/Selective_chemistry_of_single-walled_nanotubes

The Radiometer Assessment using Vertically Aligned Nanotubes (RAVAN) was an experiment launched into low Earth orbit on ...

https://en.wikipedia.org/wiki/Radiometer_Assessment_using_Vertically_Aligned_Nanotubes

However, the properties of BN nanotubes are very different: whereas carbon nanotubes can be metallic or semiconducting ... 2002). "Transformation of BxCyNz Nanotubes to Pure BN Nanotubes" (PDF). Applied Physics Letters. 81 (6): 1110. Bibcode: ... are used for mass-production of BN nanotubes at a tens of grams scale. BN nanotubes can also be produced by ball milling of ... Biocompatibility evaluation of boron nitride nanotubes", Boron Nitride Nanotubes in Nanomedicine, Micro and Nano Technologies, ...

https://en.wikipedia.org/wiki/Boron_nitride_nanotube

A device generating linear or rotational motion using carbon nanotube(s) as the primary component, is termed a nanotube ... In the case of nanotube nanomotors however, the intershell friction in the multi-walled nanotubes (MWNT) is remarkably small. ... 2001). "Engineering Carbon Nanotubes and Nanotube Circuits Using Electrical Breakdown". Science. 292 (5517): 706-709. Bibcode: ... Carbon nanotube Carbon nanotube actuators Molecular motor Motor (disambiguation) Nanomotor Nanotechnology Synthetic molecular ...

https://en.wikipedia.org/wiki/Carbon_nanotube_nanomotor

Graphenated carbon nanotubes are a relatively new hybrid that combines graphitic foliates grown along the sidewalls of ... Pham, Kien-Cuong; McPhail, David S.; Mattevi, Cecilia; Wee, Andrew T.S.; Chua, Daniel H. C. (2016). "Graphene-Carbon Nanotube ... Cui, Hong-tao; O. Zhou; B. R. Stoner (2000). "Deposition of aligned bamboo-like carbon nanotubes via microwave plasma enhanced ... also reported a similar structure, namely "graphene-carbon nanotube hybrids", grown directly onto carbon fiber paper to form an ...

https://en.wikipedia.org/wiki/Graphenated_carbon_nanotube

Non-carbon nanotubes are morphologically similar to carbon nanotubes and are observed in some mineral deposits of natural ... However, the first synthetic non-carbon nanotubes did not appear until Reshef Tenne et al. reported the synthesis of nanotubes ... or group III-Nitrides and morphologically similar to a carbon nanotube. Non-carbon nanotubes have been observed to occur ... also form non-carbon nanotubes. More recent nanotube and nanowire materials are transition metal/chalcogen/halogenides (TMCH), ...

https://en.wikipedia.org/wiki/Non-carbon_nanotube

... could refer to : Carbon nanotube field-effect transistor tunnel diode made from a carbon nanotube ... This disambiguation page lists articles associated with the title Carbon nanotube transistor. If an internal link led you here ...

https://en.wikipedia.org/wiki/Carbon_nanotube_transistor

... are springs made of carbon nanotubes (CNTs). They are an alternate form of high density, lightweight, ... When multi-walled nanotubes (MWCNTs) are loaded, the majority of the applied load is borne by the outer shell. Owing to this ... Hill, F A; Havel, T F; Hart, A J; Livermore, C (2010). "Storing elastic energy in carbon nanotubes" (PDF). Journal of ... doi:10.1088/0960-1317/20/10/104012.[permanent dead link] Hill, F.A. Energy Storage in Carbon Nanotube Super-Springs, MIT Thesis ...

https://en.wikipedia.org/wiki/Carbon_nanotube_springs

... nanotubes to h- GaN nanotubes. This method produces less variation in the size and shape of the nanotubes produced. The ... GaN nanotubes can be made without a template. Another way to make h-GaN nanotubes is through a two- stage process that converts ... The nanotube growth for c-GaN nanotubes was done at around 1600 degrees Celsius (200 degrees higher than the conditions ... Both the size of the nanotubes and the rolling of the nanotube play a part in the properties of any given GaNNT. The structural ...

https://en.wikipedia.org/wiki/Gallium_nitride_nanotube

The functional groups can be attached onto the side wall or ends of the carbon nanotube. The end caps of the carbon nanotubes ... Carbon nanotube chemistry involves chemical reactions, which are used to modify the properties of carbon nanotubes (CNTs). CNTs ... Amide functionalized carbon nanotubes have been shown to chelate silver nanoparticles. Carbon nanotubes modified with acyl ... Polysaccharides have been successfully been used to modify carbon nanotubes forming stable hybrids. To make carbon nanotubes ...

https://en.wikipedia.org/wiki/Carbon_nanotube_chemistry

In a carbon nanotube field-effect transistor (CNTFET), the conduction channel is made from carbon nanotubes, rather than from ... Carbon nanotube computers are a class of experimental computing processors constructed from carbon nanotube field-effect ... nanotubes). The researchers applied these refinements to a wafer with 197 8-micrometer (8,000 nanometer) carbon nanotube based ... The first carbon nanotube computer was built in 2013 by researchers at Stanford University. This one-bit processor, named ...

https://en.wikipedia.org/wiki/Carbon_nanotube_computer

Mechanical properties of carbon nanotubes Optical properties of carbon nanotubes P. Kim, C.M. Lieber (1999). "Nanotube ... They taped carbon nanotube sheets on two sides of a double sided scotch tape and applied potential on the nanotube sheets in a ... For current carbon nanotube actuators, multi-walled carbon nanotubes (MWNTs) and bundles of MWNTs have been widely used mostly ... Nanotube sheets are used as electrolyte-filled electrodes of a supercapacitor. Nanotube sheets are electrically charged by the ...

https://en.wikipedia.org/wiki/Carbon_nanotube_actuators

For metallic armchair nanotubes, there are two subbands, which cross the Fermi level, and for semiconducting nanotubes - bands ... If a carbon nanotube is a ballistic conductor, but the contacts are nontransparent, the transmission probability, T, is reduced ... Single-walled carbon nanotubes in the fields of quantum mechanics and nanoelectronics, have the ability to conduct electricity ... If the contacts are perfect, the reduced T is due to back-scattering along the nanotube only. When the resistance measured at ...

https://en.wikipedia.org/wiki/Ballistic_conduction_in_single-walled_carbon_nanotubes

A carbon nanotube quantum dot (CNT QD) is a small region of a carbon nanotube in which electrons are confined. A CNT QD is ... Carbon nanotube Optical properties of carbon nanotubes B. Zheng et al., Nano Letters 2, 895 (2002) F. Kuemmeth et al., Nature, ... Metallic leads can then be laid over the nanotube in order to connect the CNT QD up to an electrical circuit. The CNT QD has ... So called copper nanotubes (CuNTs), developed by the Chinese Academy of Sciences, are fabricated by closely aligning individual ...

https://en.wikipedia.org/wiki/Carbon_nanotube_quantum_dot

... requesting information on carbon nanotubes (CNTs) including single-walled carbon nanotubes (SWCNTs) and multi-walled carbon ... including single-walled carbon nanotubes (SWCNTs) and multi-walled carbon nanotubes (MWCNTs). NIOSH intends to evaluate the ... NIOSH published a Federal Register Notice on April 8, 2009, requesting information on carbon nanotubes (CNTs) ...

https://www.cdc.gov/niosh/docket/archive/docket161.html

Multiwall carbon nanotubes are an extremely small conductive additive for plastics. They are about 10 nanometers in diameter ... Multiwall carbon nanotubes are an extremely small conductive additive for plastics. They are about 10 nanometers in diameter ... Additionally, the small size of the nanotubes, coupled with the low loading, results in a much smoother molded part surfaces ... Citation: Rich, A., Collins, P., and Hagerstrom, J., "Nanotubes for Conductive Plastics Move to the Next Performance Level," ...

https://www.sae.org/publications/technical-papers/content/2002-01-1037/

Nokia sites use cookies to improve and personalize your experience and to display advertisements. The sites may also include cookies from third parties. By using this site, you consent to the use of cookies. Learn more ...

https://www.bell-labs.com/institute/publications/20112_ftp/

Sustainable production and use of carbon nanotube (CNT)-enabled materials requires efficient assessment of CNT environmental ... Mortimer, M. , Petersen, E. , Buchholz, B. and Holden, P. (2016), Separation of bacteria, protozoa and carbon nanotubes by ... Sustainable production and use of carbon nanotube (CNT)-enabled materials requires efficient assessment of CNT environmental ... from unbound multiwall carbon nanotubes (MWCNT) and MWCNT agglomerates using sucrose density gradient. We demonstrate ...

https://www.nist.gov/publications/separation-bacteria-protozoa-and-carbon-nanotubes-density-gradient-centrifugation

Carbon nanotube-based membranes will dramatically cut the cost of desalination. A water desalination system using carbon ... Livermore lab uses carbon nanotubes for cheaper desalination. Unhappy about the coming water shortages? Us too - thats why ... nanotube-based membranes could significantly reduce the cost of purifying water from the ocean. The technology could ...

https://foresight.org/livermore-lab-uses-carbon-nanotubes-for-cheaper-desalination/

Carbon Nanotubes Serve as Funnel for Photons on Solar Panels While solar concentrator research interest grows, one wonders if ... The latest news item comes out of MIT where researchers have formed carbon nanotubes into a kind of antenna that focuses ... The antennas are made of about 30 billion carbon nanotubes and resemble a fibrous strand with dimensions of 10 micrometers long ... considerations are already being taken into account with concerns about the price per pound of single-walled carbon nanotubes ...

https://spectrum.ieee.org/carbon-nanotubes-serve-as-funnel-for-photons-on-solar-panels

Magnified image of nanotubes mimicking gecko feet using a Scanning Electron Microscope. ... SIZE: Each bundle of carbon nanotubes measures about 70-80 µm in width. • IMAGING TOOL: Scanning electron microscope ... SIZE: Each bundle of carbon nanotubes measures about 70-80 µm in width. • IMAGING TOOL: Scanning electron microscope ... This scanning electron microscope image shows multiwalled carbon nanotubes attached to a polymer backing, an experiment ...

https://nisenet.org/catalog/scientific-image-nanotubes-mimicking-gecko-feet

Synthesis of structurally pure carbon nanotubes using molecular seeds For 20 years, carbon nanotubes (CNTs) have been the ... This is going to be a huge breakthrough for nanotubes & technology!! They still have some things to learn about it but I cant ... Synthesis of structurally pure carbon nanotubes using molecular seeds. page: 1 #liveFeed1, #liveFeed2, #liveFeed3 { margin: ... the nanotube grows slowly upwards.. Only the germ defines the latters atomic structure, as the researchers were able to ...

https://www.abovetopsecret.com/forum/thread1026574/pg1

Carbon Nanotube Muscles re: HG Wells on 3/22/2009: Science Fiction in the News ... Carbon Nanotube Muscles. Ray Baughman has created a carbon nanotube muscle that is light as air, stiffer than steel and more ... Illustration of carbon nanotube muscle expansion). At left is the artificial muscle with no voltage applied. When a voltage is ... The earliest application will probably be in solar cells; the carbon nanotube muscles can easily block or let in sunlight for ...

http://www.technovelgy.com/ct/Science-Fiction-News.asp?NewsNum=2201

... , Michael Richard ... SYNTHESIS TECHNIQUES OF CARBON NANOTUBES. Nanotube materials of ... Carbon nanotubes are the most powerful materials humans have ever discovered. A carbon nanotubes maximum measured tensile ... Carbon nanotubes have amazing electrical characteristics as well. Electrical conductivity is high. Nanotubes can be metallic or ... The chemistry of carbon nanotubes has advanced dramatically, and this field will drive carbon nanotube applications. The ...

https://www.pulsus.com/scholarly-articles/a-review-of-carbon-nanotube-structure-10973.html

Furthermore, it shows that the interaction between Glc groups in the glycopolymers and nanotubes play a key role in stabilizing ... Furthermore, it shows that the interaction between Glc groups in the glycopolymers and nanotubes play a key role in stabilizing ... We investigated the interactions of noncovalent complexes of single-wall carbon nanotubes that are wrapped by disaccharide ... Interestingly, an increased aggregation of nanotubes was also observed when interacting with a glucose (Glc) specific lectin, ...

https://www.frontiersin.org/articles/10.3389/fchem.2022.852988/full

... ... Extreme Nanowires and Single Atom Coils of Metallic Tellurium Formed Within Ultra-Narrow Carbon Nanotubes ... Single-Atom scale structural selectivity in Te nanowires encapsulated inisde ultra-narrow single-walled carbon nanotubes P. V ...

https://warwick.ac.uk/fac/sci/physics/news/extreme_nanowires_and/

With that in mind, the smart folks over at MIT have come up with a nanotube antenna that can capture and focus light energy, ... MIT Researchers Developer Carbon Nanotube Antenna To Make Solar Cells Smaller. By Matthew Chung, on 09/15/2010 01:50 PDT ... The researchers claim that the nanotubes currently lose about 13 percent of the energy that they absorb but theyre already ...

https://www.ubergizmo.com/2010/09/mit-researchers-developer-carbon-nanotube-antenna-to-make-solar-cells-smaller/

... carbon nanotubes) in small quantity for research and in bulk order for industry groups. Visit company website ...

https://www.nanowerk.com/nanocatalog/nanomaterials/MWCNT/details/1132

The team says thats because the nanotubes created bridges between the fibers, thereby increasing friction. The nanotubes also ... Carbon nanotubes are known to make composites tougher, and adding them to aramid/PAE further improved impact resistance. ... Now, researchers report in ACS Applied Nano Materials that carbon nanotubes and polyacrylate strengthen conventional aramid to ... Stab-Resistant Fabric Gains Strength from Carbon Nanotubes, Polyacrylate. This polyacrylate emulsion method could be used to ...

https://www.labmanager.com/stab-resistant-fabric-gains-strength-from-carbon-nanotubes-polyacrylate-30160

Here, the authors report a bio-inspired catalyst in which hybridization of iron 3delectrons with a carbon nanotube alters its ... iron phthalocyanine with an axial ligand anchored on single-walled carbon nanotubes, demonstrating higher electrocatalytic ... Functionalization of carbon nanotubes by electrochemical reduction of aryl diazonium salts: a bucky paper electrode. J. Am. ... Cao, R., Thapa, R., Kim, H. et al. Promotion of oxygen reduction by a bio-inspired tethered iron phthalocyanine carbon nanotube ...

https://www.nature.com/articles/ncomms3076?error=cookies_not_supported&code=498d16ff-3a30-4457-877b-034659983360

Single-walled carbon nanotubes (SWCNTs) provide natural one-dimensional confinement that can be implemented for encapsulation, ... Magnetic nanoribbons with embedded cobalt grown inside single-walled carbon nanotubes D. M. Krichevsky, L. Shi, V. S. Baturin, ... However, there have been only a limited amount of approaches to form ordered magnetic structures inside the nanotube channels ...

https://pubs.rsc.org/en/content/articlelanding/2022/nr/d1nr06179h

The carbon nanotubes electrical characteristics were observed by Raman Spectroscopy and the carbon nanotubes electro-optical ... In this work, we obtained carbon nanotubes with semiconductor properties and carbon nanotubes with metallic properties. The ... The carbon nanotubes were deposited using pure methane plasmas. Three methods were used for the surface modification of the ... The carbon nanotubes are high aligned and show singular properties that can be used for many applications. ...

https://www.scirp.org/journal/paperinformation.aspx?paperid=4779

Aligned "Metallic" Carbon Nanotubes Convert Heat to Electrical Energy With Higher Power Output ... Aligned carbon nanotubes (CNTs) grown by chemical vapor deposition are typically wavy, as seen in side view at the center of ... Carbon nanotubes are from 1,000 to 10,000 times longer than they are thick, so they deform principally along their length. ... TOPICS:AeronauticsMaterials ScienceMITNanoscienceNanotechnologyNanotubes. By Denis Paiste, Materials Research Laboratory; MIT ...

https://scitechdaily.com/creating-predictable-patterns-from-unpredictable-carbon-nanotubes/

Tags: carbon nanotubes, future tech, Heavy metals, innovation, Lead, mercury, science, toxic water, Water contamination, water ... Carbon nanotube material removes 99% of heavy metals from water. Tuesday, August 01, 2017 by: Russel Davis ... More news on carbon nanotubes Australian researchers use "green and cost-efficient" microscopic nanosprings to break down ... "Pantry" science: MIT researchers grow carbon nanotubes using common kitchen ingredients. Fancy new fabric reacts to body heat, ...

https://naturalnews.com/2017-08-01-carbon-nanotube-material-removes-99-of-heavy-metals-from-water.html

Carbon nanotubes (CNTs) will be chemically modified to induce ion selective adsorption. Also, aligned carbon nanotubes will be ...

https://sense.nl/research/water-desalination-with-chemically-modified-carbon-nanotube-electrodes/

Graphene Nanotubes Prevent Static Electricity Buildup in TPU Hoses. Article-Graphene Nanotubes Prevent Static Electricity ... The nanotube-modified hoses meet the demands of heavy-duty operating applications, which frequently require a combination of ... Additionally, graphene nanotubes low working dosages make it possible to maintain the abrasion and chemical resistance, ... "By adding only 0.4 to 0.5 wt% of graphene nanotubes, our client was able to obtain thermoplastic polyurethane with resistance ...

https://www.plasticstoday.com/materials/graphene-nanotubes-prevent-static-electricity-buildup-tpu-hoses

Paint with graphene nanotubes can be heated up to 40 C in a few minutes.. Nanotube solutions have already passed the ... Nanotubes/Buckyballs/Fullerenes/Nanorods TUS researchers propose a simple, inexpensive approach to fabricating carbon nanotube ... Graphene nanotube paint and varnish solutions for residential heating have passed the development phase and are entering the ... Primers with graphene nanotubes offer a new solution for electrostatic painting of automotive parts July 16th, 2021 ...

http://www.nanotech-now.com/news.cgi?story_id=56859

... has shown for the first time that chemical reactions at the nano-level which change the structure of carbon nanotubes can be ... the nanotube itself can be involved in unexpected chemical reactions. Carbon nanotubes are remarkable nanostructures with a ... Video shows nanotube spins as it grows (w/ Videos). Jul 27, 2009 ... The effects of hydrogen on growing carbon nanotubes. Oct 5, ... Carbon nanotube structures changed by attack from within, researchers discover. by University of Nottingham ...

https://phys.org/news/2011-08-carbon-nanotube.html

Nanotubes beam out bright light. Posted on 2013-12-24. 2013-12-24. by DOPS ... have generated extra-bright beams of infrared light from single-walled carbon nanotubes. ...

http://dops.dk/news/nanotubes-beam-out-bright-light.htm

Scientists from Rice University in Texas have unveiled a new carbon nanotube (CNT) fibre that looks and acts like textile ... contained long nanotubes with few atomic defects. In 2010, Pasquali and Talmon began experimenting with nanotubes from ... Ideally, these nanotubes will be perfectly aligned - like pencils in a box - and tightly packed. Some labs have explored means ... Nanotubes conductive properties - for both electricity and heat - rival the best metal conductors. They also can serve as ...

https://www.innovationintextiles.com/smart-textiles-nanotechnology/video-carbon-nanotube-fibre-breakthrough/

... sinlist.chemsec.org/chemicalgroups/carbon-nanotubes/.. 10. Daniel A. Heller et al., "Banning carbon nanotubes would be ... Carbon nanotubes (CNTs), a family of carbon-based hollow cylindrical structures, have distinctive electrical, thermal, and ... Steffen Foss Hansen and Anna Lennquist, "Carbon Nanotubes Added to the SIN List as a Nanomaterial of Very High Concern," Nature ... Recommendations for Realizing the Full Potential of Nanotechnology and Carbon Nanotubes in the Energy Transition February 1, ...

https://www.bakerinstitute.org/research/recommendations-realizing-full-potential-nanotechnology-and-carbon-nanotubes-energy-transition

BN nanotubes are predicted to behave as insulators whereas B(N) doped C-nanotubes are expected to be metallic, independent of ... Doping C-nanotubes with B and/or N is expected to be a particular interesting way for tuning electronic and mechanical ... Session U27: Focus Session: Carbon Nanotubes: Growth. 8:00 AM-11:00 AM, Thursday, March 24, 2005. LACC Room: 501C. Sponsoring ... In this framework, we have developped, both at Onera and GDPC, original routes to the synthesis of BN singlewall nanotubes (BN- ...

https://meetings.aps.org/Meeting/MAR05/Session/U27.7

article{158, author = {Qu, J. Y. and Zhao, Z. B. and Qiu, J. S. and Gogotsi, Y.}, title = {Self-assembly of carbon nanotube ... Self-assembly of carbon nanotube polyhedrons inside microchannels (Qu, J. Y., Zhao, Z. B., Qiu, J. S. and Gogotsi, Y.), In ...

https://nano.materials.drexel.edu/wp-publications/158-2/

NIOSH published a Federal Register Notice on April 8, 2009, requesting information on carbon nanotubes (CNTs) including single-walled carbon nanotubes (SWCNTs) and multi-walled carbon nanotubes (MWCNTs). (cdc.gov)
Commercialization of multi-walled carbon nanotubes (MWCNT)-based applications has been hampered by concerns regarding their lung toxicity potential. (nih.gov)
Additionally, the technology was specifically developed for, and validated in, animal studies assessing exposure to airborne multi-walled carbon nanotubes (MWCNT). (nih.gov)

For 20 years, carbon nanotubes (CNTs) have been the subject of intensive fundamental as well as applied research. (abovetopsecret.com)
Carbon nanotubes (CNTs) are carbon allotropes with a nanostructure with a length-to-diameter ratio greater than one million. (pulsus.com)
Carbon nanotubes (CNTs) are carbon allotropes. (pulsus.com)
SkySpring Nanomaterials is a worldwide manufacturer and supplier of nanoparticles, nanopowders, micron powders, and CNTs (carbon nanotubes) in small quantity for research and in bulk order for industry groups. (nanowerk.com)
Aligned carbon nanotubes (CNTs) grown by chemical vapor deposition are typically wavy, as seen in side view at the center of the illustration, rather than straight, as illustrated in a single nanotube at the right. (scitechdaily.com)
From our previous work on aligned carbon nanotubes and their composites, we learned that more tightly packing the CNTs is a highly effective way to engineer their properties," says Wardle. (scitechdaily.com)
Carbon nanotubes (CNTs) will be chemically modified to induce ion selective adsorption. (sense.nl)
Carbon nanotubes (CNTs) are fullerene-like nanostructures that consist of graphene cylinders. (nih.gov)

Here, we demonstrate optimized procedures for separation of bacteria (Pseudomonas aeruginosa) from unbound multiwall carbon nanotubes (MWCNT) and MWCNT agglomerates using sucrose density gradient. (nist.gov)
Using in vivo and in vitro approaches, we investigated the effectiveness of MWCNT functionalization with HA in increasing nanotube biocompatibility and reducing lung inflammatory and fibrotic effects. (nih.gov)
The multiwalled carbon nanotubes (MWCNT) project examines the impact of nanotube length and diameter. (nih.gov)
Pulmonary exposure to multiwalled carbon nanotubes (MWCNT) induces an inflammatory and rapid fibrotic response, although the long-term signaling mechanisms are unknown. (cdc.gov)

We investigated the interactions of noncovalent complexes of single-wall carbon nanotubes that are wrapped by disaccharide lactose-containing glycopolymers with the specific carbohydrate-binding proteins. (frontiersin.org)
A. Hagen, G. Moss, V. Talalaev and T. Hertel, "Electronic Structure and Dynamics of Optically Excited Single-Wall Carbon Nanotubes," Applied Physics A: Materials Science & Processing, Vol. 78, No. 8, 2004, pp. 1137-1145. (scirp.org)
L. Alvarez, A. Righi, S. Rols, E. Anglaret and J. L. Sauvajol, "On the Raman Spectrum of Nanobundles of Single Wall Carbon Nanotubes," Groupe de Dynamique des Phases Condenseés, Universite de Montpellier II, Montpellier, 2004. (scirp.org)

Massachusetts Institute of Technology Superfund Research Program researchers have developed a sensitive and inexpensive carbon nanotube-based sensor that can measure N-nitrosamines in air. (nih.gov)

When ammonia gas is present, the conductivity of the nanotubes decreases, and thus resistance increases -- which can be easily measured. (extremetech.com)
Replacement of a standard compound with TPU modified with graphene nanotubes results in stable, homogeneous conductivity of the final hoses, without compromising their strength or flexibility," said Maus. (plasticstoday.com)
Like other 'p-type', electrophilic dopants - as opposed to 'n-type', or nucleophilic, dopants - iron chloride draws electrons from nanotubes, increasing the conductivity of a material. (chemistryworld.com)
The working concentration of graphene nanotubes could be 50 times less than the dosage of graphite powder to reach the required level of electrical conductivity for generating heat. (nanotech-now.com)

Second, carbon nanotubes have been used in sensors before, but usually the process involves dissolving SWCNTs in solvents, which can be dangerous. (extremetech.com)
The tubes had at least two layers, and typically many more, and their outer diameters ranged from 3nm toto 5 nm.Two years later, singlewalled carbon nanotubes were discovered (SWCNTs were). (pulsus.com)
Single-walled carbon nanotubes (SWCNTs) provide natural one-dimensional confinement that can be implemented for encapsulation, nanosynthesis, and polymerization of molecules into nanoribbons. (rsc.org)

developed single-walled carbon nanotubes using the same method as MWCNTs, but with the addition of transition metal particles to the carbon electrodes. (pulsus.com)
Methanol Oxidation at Platinum Coated Black Titania Nanotubes and Titanium Felt Electrodes. (bvsalud.org)

Multiwalled carbon nanotube-induced pulmonary inflammatory and fibrotic responses and genomic changes following aspiration exposure in mice: a 1-year postexposure study. (cdc.gov)

Unlike conventional electrostatic discharge protection methods, graphene nanotubes won't negatively affect TPU properties. (plasticstoday.com)
Thermoplastic polyurethane (TPU) modified with graphene nanotubes can prevent electrostatic buildup without affecting hose strength or flexibility, according to Christian Maus, PhD, Development and Support Leader for Thermoplastics at OCSiAl Group . (plasticstoday.com)
By adding only 0.4 to 0.5 wt% of graphene nanotubes, our client was able to obtain thermoplastic polyurethane with resistance on the order of 10 6 ohm/sq, allowing the hoses to meet the typical requirements of industrial norms related to electrostatic risks. (plasticstoday.com)
Additionally, graphene nanotubes' low working dosages make it possible to maintain the abrasion and chemical resistance, flexibility, and non-marking properties of TPU," said Maus. (plasticstoday.com)
The use of graphene nanotubes increases productivity of conductive paints and improves their performance compared to standard conductive additives. (nanotech-now.com)
Paint with graphene nanotubes can be heated up to 40 C in a few minutes. (nanotech-now.com)
Increased productivity and improved performance of conductive heating paint were achieved by replacing standard conductive carbon additives, whose working concentration was about 25% of the total compound weight, with 0.5% graphene nanotubes from OCSiAl. (nanotech-now.com)
Graphene nanotube paint and varnish solutions for residential heating have passed the development phase and are entering the market in the form of eco-friendly heating panels and conductive paints. (nanotech-now.com)
Learn more on graphene nanotubes at tuball.com. (nanotech-now.com)

Carbon nanotubes are from 1,000 to 10,000 times longer than they are thick, so they deform principally along their length. (scitechdaily.com)
Made by linking carbon atoms into a cylindrical pattern, such nanotubes are about 10,000 times smaller than width of a human hair. (nih.gov)

Carbon nanotubes are known to make composites tougher, and adding them to aramid/PAE further improved impact resistance. (labmanager.com)
In the first in vivo demonstration of spectral triangulation, biocompatible composites of single-walled carbon nanotubes in Matrigel have been surgically implanted into mouse ovaries and then noninvasively detected and located. (nih.gov)

Nanotechnology: Should carbon nanotubes be handled in the workplace like asbestos? (cdc.gov)
Nanotube exposure induces the nanotechnology industry is a multibillion dollar industry and is expected to reach a trillion dollars by 2015. (cdc.gov)

With MIT's carbon nanotube pencil (Opens in a new window) , the lead is formed by compressing single-walled carbon nanotubes (SWCNT), until you have a substance that looks and behaves very similarly to graphite. (extremetech.com)

The latest news item comes out of MIT where researchers have formed carbon nanotubes into a kind of antenna that focuses photons onto photovoltaic cells and reportedly concentrates solar energy 100 times more than a regular cell. (ieee.org)
While this is all very far off from even a full-fledged prototype since the researchers have not yet built a photovoltaic cell that could use the antenna, it seems that commercial considerations are already being taken into account with concerns about the price per pound of single-walled carbon nanotubes being discussed. (ieee.org)
The researchers claim that the nanotubes currently lose about 13 percent of the energy that they absorb but they're already working on new antennas that could lose only 1 percent. (ubergizmo.com)
Now, researchers report in ACS Applied Nano Materials that carbon nanotubes and polyacrylate strengthen conventional aramid to produce lightweight, soft fabrics that provide better protection. (labmanager.com)
A recolored optical image obtained by MIT researchers shows a heart-shaped carbon nanotube cell. (scitechdaily.com)
Simply shaking up a solution of carbon nanotubes can alter the tubes' electronic properties, say researchers at McMaster University in Canada. (chemistryworld.com)
Researchers found that cancer cells use straw-like nanotubes to siphon mitochondria from immune cells, essentially draining their energy. (nih.gov)
Under an electron microscope, the researchers saw long, hollow appendages called nanotubes connecting the cancer cells and T cells. (nih.gov)

This work is published in 'Single-Atom scale structural selectivity in Te nanowires encapsulated inisde ultra-narrow single-walled carbon nanotubes' P. V. C. Medeiros, S. R. Marks, J. M. Wynn, A. Vasylenko, Q. Ramasse, D. Quigley, J. Sloan, A. J. Morris, ACS Nano, ASAP (2017). (warwick.ac.uk)

Multiwall carbon nanotubes are an extremely small conductive additive for plastics. (sae.org)

Here, creating a carbon nanotube sensor is as simple as drawing on a piece of paper -- either by a human, or an automated process. (extremetech.com)

Carbon nanotube exposure has been evaluated under a NIOSH-NIEHS Interagency agreement to provide a better assessment of US worker exposures and occupational health concerns. (nih.gov)

The team says that's because the nanotubes created bridges between the fibers, thereby increasing friction. (labmanager.com)
The filters, produced in a Rice University laboratory, was developed from carbon nanotube materials that were grown in place on chemically-epoxidized quartz fibers. (naturalnews.com)

Confocal microscopy demon- exposures to workers likely during the production strated nanotubes within the nucleus that were in or use of commercial products. (cdc.gov)
This study will measure workplace exposures to carbon nanotubes and carbon nanofibers among a representative sample of US manufacturers and downstream users. (nih.gov)

The antennas are made of about 30 billion carbon nanotubes and resemble a fibrous strand with dimensions of 10 micrometers long and four micrometers thick. (ieee.org)

Phaedon Avouris has a good overview of future electronic applications of nanotubes published in IEEE Spectrum. (foresight.org)

Here we report a novel bio-inspired composite electrocatalyst, iron phthalocyanine with an axial ligand anchored on single-walled carbon nanotubes, demonstrating higher electrocatalytic activity for oxygen reduction than the state-of-the-art Pt/C catalyst as well as exceptional durability during cycling in alkaline media. (nature.com)
Iron is often used as a catalyst for nanotube growth, but it is difficult to eliminate entirely from later processing. (chemistryworld.com)

The nanotube-modified hoses meet the demands of heavy-duty operating applications, which frequently require a combination of electrostatic discharge protection and high abrasion resistance and durability. (plasticstoday.com)

Additionally, the small size of the nanotubes, coupled with the low loading, results in a much smoother molded part surfaces than when larger additives are used. (sae.org)

For each kind of silicon wafer surface, the carbon nanotubes were deposited with two different deposition times (two and three hours). (scirp.org)
The nanotubes above have been carefully aligned on a special type of silicon chip called a carbon-nanotube size-tunable-enrichment-microdevice (CNT-STEM). (nih.gov)

The carbon nanotubes are high aligned and show singular properties that can be used for many applications. (scirp.org)
R. Mansano and A. Mousinho, "Electro-Optical Properties of Carbon Nanotubes Obtained by High Density Plasma Chemical Vapor Deposition," Materials Sciences and Applications , Vol. 2 No. 5, 2011, pp. 381-389. (scirp.org)
G. L. Zhao, D. Bagayoko and L. Yang, "Optical Properties of Aligned Carbon Nanotubes Mats for Photonic Applications," Journal of Applied Physics, Vol. 99, No. 11, 2006, pp. 114311-114311-5. (scirp.org)
But John Robertson, an electrical engineer at the University of Cambridge, says the finding is by no means revolutionary and thinks the applications of nanotubes in electronics are still limited. (chemistryworld.com)

The first is that MIT has found a form of carbon nanotubes that is stable, safe, and cheap to produce. (extremetech.com)

With that in mind, the smart folks over at MIT have come up with a nanotube antenna that can capture and focus light energy, potentially allowing much smaller and more powerful solar arrays. (ubergizmo.com)

Aside from diamond, graphite and fullerene, the quasi-one-dimensional nanotube was originally identified by Ijima in 1991 in carbon soot produced by an arc-discharge process. (pulsus.com)
However, in comparison with carbon black, graphite, or metal parts, nanotubes make it possible to obtain a more uniform consistency of paint and do not affect its practical properties. (nanotech-now.com)

Carbon nanotubes are so sensitive that MIT's hand-drawn sensor can detect concentrations of ammonia as low as 0.5 parts per million (ppm). (extremetech.com)
or perhaps their very own carbon nanotube pencil, for MacGyver-like sensor fabrication in the field. (extremetech.com)

The initial phase of the project included the procurement and physical and chemical characterization of 24 commercially available carbon nanotubes to evaluate the diversity of commercially available materials. (nih.gov)

Carbon nanotubes have incredible mechanical qualities due to the strength of their carbon-carbon bonds. (pulsus.com)

Peter Kruse and colleague Kevin Moonoosawmy have found that reactions occurring when nanotubes are shaken in particular solvents - a routine procedure - produce chemicals that draw electrons from the nanotubes, effectively doping them. (chemistryworld.com)
They noticed unexplained peak shifts in the Raman spectra of nanotubes that had been sonicated in chlorinated solvents. (chemistryworld.com)

The structural, electrical, mechanical, electromechanical, and chemical properties of carbon nanotubes have been studied extensively over the last decade. (pulsus.com)
The carbon nanotubes structural characteristics were analyzed by Atomic Force Microscope and Scanning Electronic Microscope. (scirp.org)
C. Li and T. W. Chou, "A Structural Mechanics Approach for the Analysis of Carbon Nanotubes," International Journal of Solids and Struc-tures, Vol. 40, No. 10, May 2003, pp. 2487-2499. (scirp.org)

This result indicates that the wrapping conformation of glycopolymers on the surface of nanotubes potentially allows improved accessibility of the Glc for specific lectins. (frontiersin.org)

Sustainable production and use of carbon nanotube (CNT)-enabled materials requires efficient assessment of CNT environmental hazards, including their potential for bioaccumulation and biomagnification in environmental receptors. (nist.gov)
Carbon nanotubes are the most powerful materials humans have ever discovered. (pulsus.com)

Single-walled nanotubes are typically smaller than multi-walled tubes, with widths ranging from 1- 2 nm with a bent rather than straight shape. (pulsus.com)

The carbon nanotubes electrical characteristics were observed by Raman Spectroscopy and the carbon nanotubes electro-optical properties were analyzed by current vs voltage electrical measurements and photo-luminescence spectroscopy measurements. (scirp.org)
The photoelectric effect in the carbon nanotubes were determined by photo-induced current measurements. (scirp.org)

Carbon nanotubes are highly desirable because of their thermal, electrical, and mechanical properties, which are directionally dependent. (scitechdaily.com)

The nanotube bundles are similar to the potential of nanotubes to induce genetic damage size of microtubules that form the mitotic spindle in normal lung cells, cultured primary and immor- and may be incorporated into the mitotic spindle talized human airway epithelial cells were apparatus. (cdc.gov)

This scanning electron microscope image shows multiwalled carbon nanotubes attached to a polymer backing, an experiment designed to replicate the gecko foot's adhesive properties. (nisenet.org)
The difference, though, is that drawing with MIT's pencil actually deposits whole carbon nanotubes on paper -- and carbon nanotubes have some rather exciting properties. (extremetech.com)
In this work, we studied the electro-optical properties of high-aligned carbon nanotubes deposited at room temperature. (scirp.org)
In this work, we obtained carbon nanotubes with semiconductor properties and carbon nanotubes with metallic properties. (scirp.org)
Kruse thinks the research will help engineers pin down the source of unintentional doping and achieve greater control over the electronic properties of devices that use nanotubes, such as transistors. (chemistryworld.com)

Top, electron microscope image of a nanotube connecting a cancer cell with a T cell. (nih.gov)

The electro-optical effects depend strongly on the substrate preparation and the deposition parameters of the carbon nanotubes. (scirp.org)

Sixteen hours after adding these stained cells to a cancer cell culture, they saw fluorescent mitochondria from the immune cells moving through the nanotubes and into the cancer cells. (nih.gov)
They treated the mice with a combination of an inhibitor of nanotube formation and an immune checkpoint inhibitor. (nih.gov)
Inhibiting nanotube formation could thus increase the efficacy of immune checkpoint inhibitor therapies for cancer. (nih.gov)
Cancer kills when the immune system is suppressed and cancer cells are able to metastasize, and it appears that nanotubes can help them do both," Sengupta says. (nih.gov)
Intercellular nanotubes mediate mitochondrial trafficking between cancer and immune cells. (nih.gov)

The authors point out that the nanotube inhibitors they tested have other effects. (nih.gov)

However, there have been only a limited amount of approaches to form ordered magnetic structures inside the nanotube channels and the creation of magnetic nanoribbons is still lacking. (rsc.org)

Arc discharge, laser ablation and chemical vapour deposition are some of the techniques that have been developed to create nanotubes in large quantities. (pulsus.com)
We assumed that all the chemical procedures in nanotube preparation were well-studied. (chemistryworld.com)

Sensitivity studies showed a detection limit of ∼120 pg of nanotubes located beneath ∼3 mm of tissue. (nih.gov)
Endothelial cell nanotube insertions into cardiac and skeletal myocytes during coordinated tissue development. (nih.gov)

The findings and conclusions in this report are those of the authors and do not necessarily represent the views of the National Institute for Occu- sity and small size of carbon nanotubes makes respiratory pational Safety and Health. (cdc.gov)

The carbon nanotubes were deposited using pure methane plasmas. (scirp.org)

SIZE: Each bundle of carbon nanotubes measures about 70-80 µm in width. (nisenet.org)

Anatomy2

Diseases1

Chemicals and Drugs20

Analytical, Diagnostic and Therapeutic Techniques and Equipment18

Phenomena and Processes7

Disciplines and Occupations4

Technology, Industry, Agriculture18

Health Care2

Selective cell targeting with light-absorbing microparticles and nanoparticles. (1/401)

Self-assembly of single integral membrane proteins into soluble nanoscale phospholipid bilayers. (2/401)

DNA nanotubes self-assembled from triple-crossover tiles as templates for conductive nanowires. (3/401)

Self-association process of a peptide in solution: from beta-sheet filaments to large embedded nanotubes. (4/401)

RNA-mediated metal-metal bond formation in the synthesis of hexagonal palladium nanoparticles. (5/401)

Tracking the recruitment of diabetogenic CD8+ T-cells to the pancreas in real time. (6/401)

Preparation of DNA-modified nanoparticles and preliminary study for colorimetric SNP analysis using their selective aggregations. (7/401)

Energetic clues to pathways to biomineralization: precursors, clusters, and nanoparticles. (8/401)

Nanotubes, Carbon

Nanotubes

Nanotubes, Peptide

Nanotechnology

Graphite

Fullerenes

Nanocomposites

Nanostructures

Soot

Biosensing Techniques

Microscopy, Electron, Transmission

Spectrum Analysis, Raman

Thermogravimetry

Microscopy, Electron, Scanning

Nanomedicine

Electrodes

Materials Testing

Particle Size

Semiconductors

Conductometry

Adsorption

Carbon

Electrochemistry

Metal Nanoparticles

Surface Properties

Electrochemical Techniques

Titanium

Nanowires

Cell Surface Extensions

Enzymes, Immobilized

Mechanical Phenomena

Infrared Rays

Granuloma, Foreign-Body

Cell Membrane Structures

Cinchona Alkaloids

Biocompatible Materials

Transistors, Electronic

Biomedical and Dental Materials

Polymers

Gold

Spectroscopy, Fourier Transform Infrared

Microscopy, Atomic Force

Ecotoxicology

Inhalation Exposure

Quantum Dots

DNA, A-Form

Fluorocarbon Polymers

Dendrimers

Surface-Active Agents

Drug Delivery Systems

Polyacetylenes

Optical Devices

Dielectric Spectroscopy

Organosilicon Compounds

Water

Glass

Nanofibers

Thermal Conductivity

Selective cell targeting with light-absorbing microparticles and nanoparticles. (1/401)

Self-assembly of single integral membrane proteins into soluble nanoscale phospholipid bilayers. (2/401)

DNA nanotubes self-assembled from triple-crossover tiles as templates for conductive nanowires. (3/401)

Self-association process of a peptide in solution: from beta-sheet filaments to large embedded nanotubes. (4/401)

RNA-mediated metal-metal bond formation in the synthesis of hexagonal palladium nanoparticles. (5/401)

Tracking the recruitment of diabetogenic CD8+ T-cells to the pancreas in real time. (6/401)

Preparation of DNA-modified nanoparticles and preliminary study for colorimetric SNP analysis using their selective aggregations. (7/401)

Energetic clues to pathways to biomineralization: precursors, clusters, and nanoparticles. (8/401)

Carbon nanotubes in medicine

Carbon nanotubes in interconnects

Timeline of carbon nanotubes

Synthesis of carbon nanotubes

Carbon nanotubes in photovoltaics

Nanotube

Carbon nanotubes for water transport

Potential applications of carbon nanotubes

Mechanical properties of carbon nanotubes

Optical properties of carbon nanotubes

Phenine nanotube

Nanotube membrane

BCN nanotube

Tunneling nanotube