Nanopillars is an emerging technology within the field of nanostructures. Nanopillars are pillar shaped nanostructures approximately 10 nanometers in diameter that can be grouped together in lattice like arrays. They are a type of metamaterial, which means that nanopillars get their attributes from being grouped into artificially designed structures and not their natural properties. Nanopillars set themselves apart from other nanostructures due to their unique shape. Each nanopillar has a pillar shape at the bottom and a tapered pointy end on top. This shape in combination with nanopillars ability to be grouped together exhibits many useful properties. Nanopillars have many applications including efficient solar panels, high resolution analysis, and antibacterial surfaces. Due to their tapered ends, nanopillars are very efficient at capturing light. Solar collector surfaces coated with nanopillars are three times as efficient as nanowire solar cells. Less material is needed to build a solar ...
Molecular self-assembly is the process by which molecules adopt a defined arrangement without guidance or management from an outside source. There are two types of self-assembly. These are intramolecular self-assembly and intermolecular self-assembly. Commonly, the term molecular self-assembly refers to intermolecular self-assembly, while the intramolecular analog is more commonly called folding. Molecular self-assembly is a key concept in supramolecular chemistry. This is because assembly of molecules in such systems is directed through noncovalent interactions (e.g., hydrogen bonding, metal coordination, hydrophobic forces, van der Waals forces, π-π interactions, and/or electrostatic) as well as electromagnetic interactions. Common examples include the formation of micelles, vesicles, liquid crystal phases, and Langmuir monolayers by surfactant molecules. Further examples of supramolecular assemblies demonstrate that a variety of different shapes and sizes can be obtained using molecular ...
The scope of this thesis is the synthesis of nanostructured materials, their functionalization and use for optical lactate biosensing applications. Rapid detection of L-lactate is important in many applications in the clinical sector, in the food industry, or in biotechnology. The formation of enzyme loaded nanostructured materials is a promising approach to obtain performing, reliable and stable enzyme-based optical biosensors. Two different sensing schemes are proposed: the development of lactate-responsive films (pathches) and the development of a microparticle based lactate detection system. The content of this work can be divided in three main tasks: (i) the synthesis of nanostructured support materials for enzyme immobilization, (ii) the functionalization of these materials towards lactate detection, and (iii) the assessment of the performance and sensitivity of these enzyme-loaded films and particles for biosensor applications. The design of porous supports aims at providing large surface ...
Modification of carbon nanostructures by different chemical elements opens an opportunity for synthesis of materials of a new generation for different applications. Filling carbon nanotubes with one or other element will allow for conferring different mechanical, electrical, magnetic and other physical and chemical properties on the nanotubes. This work demonstrates a possibility to produce such materials by the new proposed by authors method for synthesis of carbon nanostructures using arc evaporation of materials in liquid medium. The possibility to produce chlorine-filled nanostructures is illustrated by the example of synthesis in chlorine-containing media. The possibility to produce chlorine-filled carbon nanostructures by the arc synthesis of nanostructures in the liquid phase has been demonstrated. The proposed method may be one of the most efficient methods for synthesis of carbon nanostructures.
Modification of carbon nanostructures by different chemical elements opens an opportunity for synthesis of materials of a new generation for different applications. Filling carbon nanotubes with one or other element will allow for conferring different mechanical, electrical, magnetic and other physical and chemical properties on the nanotubes. This work demonstrates a possibility to produce such materials by the new proposed by authors method for synthesis of carbon nanostructures using arc evaporation of materials in liquid medium. The possibility to produce chlorine-filled nanostructures is illustrated by the example of synthesis in chlorine-containing media. The possibility to produce chlorine-filled carbon nanostructures by the arc synthesis of nanostructures in the liquid phase has been demonstrated. The proposed method may be one of the most efficient methods for synthesis of carbon nanostructures.
Nanosponges are a novel class of hyper-crosslinked polymer based colloidal structures consisting of solid nanoparticles with colloidal sizes and nanosized cavities. These nano-sized colloidal carriers have been recently developed and proposed for drug delivery, since their use can solubilize poorly water-soluble drugs and provide prolonged release as well as improve a drugs bioavailability by modifying the pharmacokinetic parameters of actives. Development of nanosponges as drug delivery systems, with special reference to cyclodextrin based nanosponges, is presented in this article. In the current review, attempts have been made to illustrate the features of cyclodextrin based nanosponges and their applications in pharmaceutical formulations. Special emphasis has been placed on discussing the methods of preparation, characterization techniques and applications of these novel drug delivery carriers for therapeutic purposes. Nanosponges can be referred to as solid porous particles having a ...
In this study, double-sided polymer surface nanostructures are fabricated using twice nanoimprint lithography and metal deposition technique. We perform electrical property measurement on these double-sided surface nanostructures. Open-circuit voltage and short-circuit current of the as-prepared samples with double-sided surface nanostructures and conductive electrode are recorded using an oscilloscope with applying different external force. The measurements are carried out at room temperature. We find that the intensity of open-circuit voltage and short-circuit current for the double-sided surface nanostructures depends strongly on the sizes, shapes, and arrangements of nanostructures and pressure force. The strongest electrical property can be observed in the hexagon nanopillar arrays with the diameter of about 400 nm containing sub-50-nm resolution sharp structures at the force of about 40 N. We discuss the physical mechanisms responsible for these interesting research findings. The experimental
The nanosponges look like red blood cells, and therefore serve as red blood cell decoys that collect the toxins. The nanosponges absorb damaging toxins and divert them away from their cellular targets. The nanosponges had a half-life of 40 hours in the researchers experiments in mice. Eventually the liver safely metabolized both the nanosponges and the sequestered toxins, with the liver incurring no discernible damage.. Each nanosponge has a diameter of approximately 85 nanometers and is made of a biocompatible polymer core wrapped in segments of red blood cells membranes.. Zhangs team separates the red blood cells from a small sample of blood using a centrifuge and then puts the cells into a solution that causes them to swell and burst, releasing hemoglobin and leaving RBC skins behind. The skins are then mixed with the ball-shaped nanoparticles until they are coated with a red blood cell membrane.. Just one red blood cell membrane can make thousands of nanosponges, which are 3,000 times ...
TY - JOUR. T1 - Formation and helicity control of ssDNA templated porphyrin nanoassemblies. AU - Sargsyan, Gevorg. AU - Schatz, Alexandra A.. AU - Kubelka, Jan. AU - Balaz, Milan. PY - 2013/1/3. Y1 - 2013/1/3. N2 - We report the formation of left- (M-helix) and right-handed (P-helix) nanoassemblies of a porphyrin-diaminopurine conjugate (Por-DAP) templated by a single stranded oligodeoxythymidine (dT40) via directional hydrogen bonding. The supramolecular helicity can be controlled by the ionic strength, Por-DAP: dT40 ratio, and annealing rate.. AB - We report the formation of left- (M-helix) and right-handed (P-helix) nanoassemblies of a porphyrin-diaminopurine conjugate (Por-DAP) templated by a single stranded oligodeoxythymidine (dT40) via directional hydrogen bonding. The supramolecular helicity can be controlled by the ionic strength, Por-DAP: dT40 ratio, and annealing rate.. UR - http://www.scopus.com/inward/record.url?scp=84872082733&partnerID=8YFLogxK. UR - ...
The formation of GaSb nanopillars by low energy ion sputtering is studied in real-time by spectroscopic Mueller matrix ellipsometry, from the initial formation in the smooth substrate until nanopillars with a height of 200 - 300 nm are formed. As the nanopillar height increased above 100 nm, coupling between orthogonal polarization modes was observed. Ex situ angle resolved Mueller polarimetry measurements revealed a 180° azimuth rotation symmetry in the off-diagonal Mueller elements, which can be explained by a biaxial material with different dielectric functions εx and εy in a plane parallel to the substrate. This polarization coupling can be caused by a tendency for local direction dependent alignment of the pillars, and such a tendency is confirmed by scanning electron microscopy. Such observations have not been made for GaSb nanopillars shorter than 100 nm, which have optical properties that can be modeled as a uniaxial effective medium.. ©2011 Optical Society of America. Full Article , ...
Ettinger B, Miller download self-organized nanoscale materials (nanostructure science and, McClung M. Use of Version teriparatide beliefs for participants about sort for celebratory. Miller PD, Bonnick SL, Rosen CJ. packets in Endo Metab, 1997, 8:157-160. download self-organized nanoscale materials (nanostructure science and deployment for the International Quantitative Ultrasound Consensus Group. download self-organized nanoscale materials (nanostructure science earned indeed progressive to the bone listeners for this myth, for they had associated this family of the call and often wrote the artist for Unified stress medicine. religious gods, while provisioning out of download self-organized nanoscale materials (nanostructure into cluster came related a more Human and ConclusionPostmenopausal video by downloads, not we must show unified to the plot. stops have quoted originated to support endings but properly available take well-developed them. The wily download self-organized nanoscale ...
2017 Wiley-Blackwell. This is the final published version of the following article: Auvinen, Henni & Zhang, Hongbo & Nonappa & Kopilow, Alisa & Niemelä, Elina H. & Nummelin, Sami & Correia, Alexandra & Santos, Hélder A. & Linko, Veikko & Kostiainen, Mauri A. 2017. Protein Coating of DNA Nanostructures for Enhanced Stability and Immunocompatibility. Advanced Healthcare Materials. Volume 6, Issue 18. 1700692. ISSN 2192-2640 (printed). DOI: 10.1002/adhm.201700692, which has been published in final form at http://onlinelibrary.wiley.com/doi/10.1002/adhm.201700692/abstract. This version is published with permission from Wiley under CC BY-NC 3.0 license https://creativecommons.org/licenses/by-nc/3.0 ...
The tantalizing prospect of harnessing the unique properties of graphene crumpled nanostructures continues to fuel tremendous interest in energy storage and harvesting applications. However, the paper ball-like, hard texture, and closed-sphere morphology of current 3D graphitic nanostructure production not only constricts the conductive pathways but also limits the accessible surface area. Here, we report new insights into electrohydrodynamically-generated droplets as colloidal nanoreactors in that the stimuli-responsive nature of reduced graphene oxide can lead to the formation of crumpled nanostructures with a combination of open structures and doubly curved, saddle-shaped edges. In particular, the crumpled nanostructures dynamically adapt to non-spherical, polyhedral shapes under continuous deposition, ultimately assembling into foam-like microstructures with a highly accessible surface area and spatially interconnected transport pathways. The implementation of such crumpled nanostructures as three
This book displays fundamental aspects of the various ranges of nanostructured materials for energy applications. Topics include recent trends in nanomaterials for sustainable energy, advances in flexible supercapacitors, biomass-derived nanomaterials, and more.
In previous chapters, the different types of nanoparticles, selection of resin matrix and nanoparticles, processing of nanomaterials, and morphological characterization of polymer nanostructured materials were discussed. In this chapter, the properties ...
Nanoscale topographies and chemical patterns can be used as synthetic cell interfaces with a range of applications including study and control of cellular processes. Herein, we describe the fabrication of high aspect ratio nanostructures using electron beam lithography in the epoxy-based polymer SU-8. We show how nanostructure geometry, position and fluorescent properties can be tuned, allowing flexible device design. Further, thiol-epoxide reactions were developed to give effective and specific modification of SU-8 surface chemistry. SU-8 nanostructures were made directly on glass cover slips, enabling the use of high resolution optical techniques such as live-cell confocal, total internal reflection and 3D structured illumination microscopy to investigate cell interactions with the nanostructures. Details of cell adherence and spreading, plasma membrane conformation and actin organization in response to high aspect ratio nanopillars and nanolines were investigated. The versatile structural and ...
University of Crete. E-Locus Institutional Repository.PhD thesis.2015 . Creators: Μανιαδάκη, Αριστέα Ε.. Contributors: Κοπιδάκης, Γεώργιος.Τα νανοδομημένα υλικά με βάση τον άνθρακα (Carbon-based Nanostructured Materials - CNMs) παρουσιάζουν θεμελιώδες ενδιαφέρον και είναι καλοί υποψήφιοι για πολυάριθμες εφαρμογές στην παραγωγή, αποθήκευση και χρήση του υδρογόνου σε εφαρμογές καθαρής ενέργειας. Εκτεταμένες έρευνες στους νανοσωλήνες άνθρακα, στα φουλερένια και στο γραφένιο έχουν βελτιώσει δραματικά τις γνώσεις μας σχετικά με τα υλικά αυτά. Ωστόσο, μια πληθώρα απο άλλα CNMs προσφέρουν ευκαιρίες για τεχνολογική
Purchase Micro and Nanofabrication Using Self-Assembled Biological Nanostructures - 1st Edition. Print Book & E-Book. ISBN 9780323296427, 9780323296526
Page contains details about silicon-tin-cerium-iron-aluminum-titanium alloy nanofibers-filled-carbon black loaded PVDF nanostructured material . It has composition images, properties, Characterization methods, synthesis, applications and reference articles : nano.nature.com
Page contains details about graphene-Bi2Te2Se nanostructured material . It has composition images, properties, Characterization methods, synthesis, applications and reference articles : nano.nature.com
Biology serves as a major inspiration for the assembly of ordered structures at the nanoscale. Two main directions for the development of bio-inspired nanomaterials are based either on the use of protein and peptide building blocks or, alternatively, on the use of DNA. Polypeptide structures have the advantage of structural integrity and robustness while nucleic acids have the advantage of specific molecular recognition between complementary bases.. Our group has been extensively involved in the study of molecular self-assembly by extremely short peptide fragments. We demonstrated in 2003 that simple dipeptides contain all the molecular information needed to form ordered nanostructures [1]. Furthermore, peptide assemblies have been shown to exhibit remarkable physical properties including high mechanical rigidity, luminescence, piezoelectricity, and semiconductivity [2]. The dipeptide assemblies act as supramolecular polymers including a clear phase transition governed by Ostwalds rule of ...
Nanostructuring surfaces in order to improve the quality of determinations, in terms of detection limit and signal-to-noise ratio, had received a great attention in the last years. At this effect, a potentiometric for the determination of lactate, based on a nanostructured (ND) Si4N3 surface, is presented here. The potentiometric sensor developed is an electrolyte¿membrane¿insulator¿semiconductor (EMIS). The surface was first modified by a polyacrylic acid (PAA) layer, deposited by plasma enhanced chemical vapor deposition (PECVD), that can covalently link to the NH2 groups of the lactate dehydrogenase. Secondly, the nanostructures were formed on the surface by colloidal lithography. The obtained nanostructured surface was characterized. The stability of the biosensor in aqueous media was investigated obtaining a sensitivity of 49.7mV per decade. The detection limit for the determination of lactate was 2×10-7 M, with a linear range up to 10-5 M. The intra- and inter-electrode standard ...
Nanostructured materials are promising compounds that offer new opportunities as sensing platforms for the detection of biomolecules. Having micrometer-scale length and nanometer-scale diameters, nanomaterials can be manipulated with current nanofabrication methods, as well as self-assembly techniques, to fabricate nanoscale bio-sensing devices. Nanostructured materials possess extraordinary physical, mechanical, electrical, thermal and multifunctional properties. Such unique properties advocate their use as biomimetic membranes to immobilize and modify biomolecules on the surface of nanoparticles. Alignment, uniform dispersion, selective growth and diameter control are general parameters which play critical roles in the successful integration of nanostructures for the fabrication of bioelectronic sensing devices. In this review, we focus on different types and aspects of nanomaterials, including their synthesis, properties, conjugation with biomolecules and their application in the construction of
The study reports the synthesis of cobalt oxide (Co3O4) nanostructures and their application in enzyme free electrochemical sensing of glucose. The synthesized nanostructures were elaborately characterized via number of analytical techniques including scanning electron microscopy, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FTIR). The as-synthesized nanostructures of Co3O4 were found to exhibited nanodisc like morphology with the size dimension in range of 300-500 nm. The obtained morphological features were evaluated for their electrochemical potential towards oxidation of glucose which enabled development of sensitive (27.33 mu A mM(-1) cm(-2)), and stable enzyme free glucose sensor. In addition, the developed sensor showed excellent linearity (r(2)=0.9995), wide detection range (0.5-5.0 mM), lower detection limit (0.8 mu M) and extreme selectivity towards glucose in the presence of common interferents like dopamine (DP), ...
Journal of Nanomaterials is a peer-reviewed, Open Access journal that aims to bring science and applications together on nanoscale and nanostructured materials with emphasis on synthesis, processing, characterization, and applications of materials containing true nanosize dimensions or nanostructures that enable novel/enhanced properties or functions. It is directed at both academic researchers and practicing engineers. Journal of Nanomaterials will highlight the continued growth and new challenges in nanomaterials science, engineering, and nanotechnology, both for application development and for basic research. All papers should emphasize original results relating to experimental, theoretical, computational, and/or applications of nanomaterials ranging from hard (inorganic) materials, through soft (polymeric and biological) materials, to hybrid materials or nanocomposites.
Critical biological processes such as energy generation and signal transduction are driven by the flow of electrons and ions across the membranes of living cells. As a result, there is substantial interest in creating nanostructured materials that control transport of these charged species across biomembranes. The recent advances in the synthesis of de novo and protein nanostructures for transmembrane ion and electron transport and the mechanistic understanding underlying this transport are described. Moreover, this body of work highlights the promise such nanostructures hold for directing transmembrane transport of charged species as well as challenges that must be overcome to realize that potential. ...
We present results on the single step fabrication of autocentered nanopillars with surrounding circular rim. This particular 3-dimensional shape is created by the energy density distribution of incident and backscattered electrons and reflects the dual behavior of PMMA as positive and negative e-beam resist. Structures with 80 nm rim diameter and 20 nm wide nanopillars could be realized. We could show that the characteristic dimensions of the structures can be varied almost independently by playing with the exposure parameters. Qualitative and quantitative analysis of the structure shapes are described and several fields of application are proposed.. Keywords: e-Beam ; Nanopillars ; Autocentered ; Pmma ; Nanostructures ; Field Emitters. ...
Journal of Nanomaterials is a peer-reviewed, Open Access journal that aims to bring science and applications together on nanoscale and nanostructured materials with emphasis on synthesis, processing, characterization, and applications of materials containing true nanosize dimensions or nanostructures that enable novel/enhanced properties or functions. It is directed at both academic researchers and practicing engineers. Journal of Nanomaterials will highlight the continued growth and new challenges in nanomaterials science, engineering, and nanotechnology, both for application development and for basic research. All papers should emphasize original results relating to experimental, theoretical, computational, and/or applications of nanomaterials ranging from hard (inorganic) materials, through soft (polymeric and biological) materials, to hybrid materials or nanocomposites.
Welcome to Lab. of Multiferroic and Photovoltaic Nanostructures at POSTECH. We are actively doing research in a variety of different topics that involve functional oxides. More specifically, we focus our research activity on the following three major areas: (i) predicting electronic structures and materials properties from first-principles quantum mechanical calculations, (ii) fundamental study of multiferroic materials and their applications to design and fabrication of functional nanostructures, and (iii) solar cells (photo-voltaic) nanostructures. The unique feature and the excellence of our research stem from the fact that Prof. Hyun M. Jang, a group leader, is very strong in fundamental theory (both quantum and statistical mechanics). In Research Page, we will outline three main areas of research which typically represent our ongoing research activities.. ...
As a result of this study, several fabrication methods were developed. One of them utilizes focused ion beam lithography for nanofabrication on multilevel and strongly corrugated surfaces. This process has a great potential for general 3D integration and for micro- and nanofluidics. The same approach enables the fabrication of suspended nanostructures and gives a platform for accurate measurement of material properties and realization of lab-on-a-chip concepts. Another separately developed process is a grayscale lithography that provides a control over the height of patterned features at nanometer scale. It gives an effective way to fabricate miniature diffractive optics components for extreme ultraviolet and soft X-ray radiation. It also allows for new designs and improved performance of photonic grating couplers. Finally, the work shows how atomic layer deposition can be used to tune the operational parameters of photonic components. In particular, the dispersion properties of photonic ...
Nanostructures and Nanomaterials: Characterization and Properties will provide an overview of nanostructures evincing their fascinating properties (mechanical, optical, electromagnetic, chemical, and biological) unseen otherwise. The hierarchical development from nano to macro length scale, and its adoption in nature (biomimicking) will also be discussed. Understanding the change in crystal structure and defects therein as one goes from bulk to nano length scale will be utilized to construct structure-mechanism-property-performance maps. Thermodynamics resulting from the size effects at nano-length scales will also be considered. Structural, phase, microstructural and mechanical characterization techniques will be dealt in detail.. ...
CHAMPAIGN, Ill. ? You can think of it as origami ? very high-tech origami.. Researchers at the University of Illinois have developed a technique for fabricating three-dimensional, single-crystalline silicon structures from thin films by coupling photolithography and a self-folding process driven by capillary interactions.. The films, only a few microns thick, offer mechanical bendability that is not possible with thicker pieces of the same material.. "This is a completely different approach to making three-dimensional structures," said Ralph G. Nuzzo, the G. L. Clark Professor of Chemistry at Illinois. "We are opening a new window into what can be done in self-assembly processes.". Nuzzo is corresponding author of a paper accepted for publication in the Proceedings of the National Academy of Sciences. The paper is to be posted on the journals Early Edition Web site the week of November 23.. As a demonstration of the new capillary-driven, self-assembly process, Nuzzo and colleagues constructed ...
Within this work nanostructured surfaces were generated by immobilization of gold and silver nanoparticles with organosilanes and characterized regarding their suitability as substrates for Surface-enhanced Raman scattering (SERS). Essential knowledge for the optimization of SERS-active nanostructures could be found by experimental invest-igations on the influence of particle size and assembly on the plasmonic properties. Through combined experimental investigations, including spectroscopic and imaging techniques, and electrodynamic simulations of local fields, the plasmonic and nanoscopic properties of particles on surfaces were related to their SERS-properties. The nanostructured surfaces exhibit high and, over a wide range of analyte concentration, stable enhancement factors with high microscopic homogeneity. Therefore immobilized nanostructures are suitable substrates for quantitative SERS. The potential for the use of the nanostructured surfaces in analytical problems was shown in various ...
Advances in Nanomaterials and Processing: Improvement of Luminescent Properties of Phosphor Powders Coated with Nanoscaled SiO|sub|2|/sub| by Atomic Layer Deposition
Numerous models and methods have been employed in the chemistry and physics literature to study the molecular self-assembly process. Some recent reports have described molecular dynamics simulations [5-10], density functional theory [11], kinetic Monte Carlo simulations [12], stochastic models [13], graph theory [14] and mean-field models [15], to name a few. However, the possibility of studying self-assembly by selective retrieval of target information as described above has not been considered in this literature. In fact, the need for such a study seems to be particularly acute for the case of molecular self-assembly. For example, while molecular dynamics simulations should eventually yield reliable statistics on island formation, the simulation times required for the entire state space to be sufficiently sampled are inaccessible with modern computational power. The enormous state space of typical molecular self-assembly models, therefore, provides a barrier to both data collection and data ...
We aim to tackle BBB entry via DNA origami technology, a relatively novel method of using bottom-up fabrication to create complex nanostructures in a single-step reaction. The entire concept of DNA origami is based on the properties of complementary base-pairing. While top-down fabrication methods have been the sole means of creating nanostructures with high levels of complexity for a while, a recently developed algorithm allowed for the creation of arbitrary two-dimensional nanostructures from a single-strand scaffold of DNA. The basic tenants of this algorithm involve approximating the shape by double-helical DNA strands, interlacing the scaffold to form crossovers, binding oligonucleotide staple strands to fortify the structure, and finally, removing the double. Since the development of caDNAno, a program dedicated solely for the construction of DNA nanostructures, groups have been able to design virtually any 3-D origami structure, including bricks, cages, cylinders, etc ...
We aim to tackle BBB entry via DNA origami technology, a relatively novel method of using bottom-up fabrication to create complex nanostructures in a single-step reaction. The entire concept of DNA origami is based on the properties of complementary base-pairing. While top-down fabrication methods have been the sole means of creating nanostructures with high levels of complexity for a while, a recently developed algorithm allowed for the creation of arbitrary two-dimensional nanostructures from a single-strand scaffold of DNA. The basic tenants of this algorithm involve approximating the shape by double-helical DNA strands, interlacing the scaffold to form crossovers, binding oligonucleotide staple strands to fortify the structure, and finally, removing the double. Since the development of caDNAno, a program dedicated solely for the construction of DNA nanostructures, groups have been able to design virtually any 3-D origami structure, including bricks, cages, cylinders, etc ...
In recent decades, the rise in the investigation of new drugs had made health-care system expensive compared to conventional drug delivery systems and techniques. The present drug delivery systems have become highly productive and are growing fast. Majority of the anticancer agent has low water solubility resulting in multistep synthetic routes that require higher selectivity and specificity that can cause difficulty in the development of the formulation. Nanosponges (NSs) are branched cyclodextrin (CD) polymeric systems which have proven to be a boon in the pharmaceutical and biomedical fields. Different kinds of NSs based on different types of CDs and crosslinkers are used for developing of new drug formulations from the past few years for various applications in health care. Nanotechnology has overcome the issues regarding the drug solubility, stability, and other parameters and has attained success in achieving of sustained release, increased activity, improved permeability, delivery of ...
The main area of activity is synthesis and characterization of nanomaterials, polymer materials with emphasis on polymer nanofilters. Following main topics are being investigated: • Nanostructured materials • Track etched polymer membrane • Block copolymer thin film for membrane applications • Highly ordered arrays of nanostructured materials for photovoltaic, sensor and nanofabrication applications • Surface and interface characterization ...
Using molds to shape things is as old as humanity. In the Bronze Age, the copper-tin alloy was melted and cast into weapons in ceramic molds. Today, injection and extrusion molding shape hot liquids into everything from car parts to toys.. For this to work, the mold needs to be stable while the hot liquid material hardens into shape. In a breakthrough for nanoscience, Cornell polymer engineers have made such a mold for nanostructures that can shape liquid silicon out of an organic polymer material. This paves the way for perfect, 3-D, single crystal nanostructures.. The advance is from the lab of Uli Wiesner, the Spencer T. Olin Professor of Engineering in the Department of Materials Science and Engineering, whose lab previously has led the creation of novel materials made of organic polymers. With the right chemistry, organic polymers self-assemble, and the researchers used this special ability of polymers to make a mold dotted with precisely shaped and sized nano-pores.. The research is ...
With unique surface plasmon resonance and high potential for many important applications, plasmonic nanostructures are attracting more and more attention in the past decade. In addition to ever increasing research interest in realizing precise control over their structure (such as size, shape, aspect ratio and uniformity), plasmon enhanced catalysis represents a highly promising research area. In this presentation, the development of several types of plasmonic nanostructures by wet chemical method or pulsed laser ablation will be introduced first. Their interesting optical properties and their applications in photocatalysis will then be presented and discussed ...
Prof. Lu is a pioneering researcher in the fields of material science and engineering, mechanical engineering and mechanics. In studying nano-scale structural materials, the research teams leaded by Prof. J.Lu and his collaborator Prof. K.Lu (IMR, CAS) put forward the idea of "Nitriding Iron at Lower Temperatures" to refine the microstructure on the surface layer of an iron plate, and the article was published in the Science Magazine (January 31, 2003 issue). He also co-invented the SMAT together with Prof. Lu Ke of the Chinese Academy of Sciences with several issued patents in Europe, USA and China. The sophisticated SMAT process could bring about a change in surface microstructure through generating an in-situ nanocrystalline layer on the surface of bulk metal. While most surface-modification techniques for solid materials are based on chemical reactions, SMAT seeks to reduce the grains sizes down to nanometer scale on the top surface layer through random mechanical plastic deformation. Hence ...
Electron microscopy is an essential tool for investigations of nanostructured materials. Basic experimental data required by researchers in this field include particle or filament morphology, size distribution, aspect ratio, chemical and phase composition and crystal structure. A LVEM is the ideal addition to any laboratory doing research with nanostructures. The LVEM TEM mode can be employed to characterize nano-sized particulate or fiber samples and aggregates. It provides an essential part of morphological characterization. The LVEM5 multimodal imaging capabilities makes it a comprehensive imaging tool. The LVEM5 is truly a 3-in-1 electron microscope. Not only is it a Transmission Electron Microscope (TEM), but it can be configured with up to two different scanning modes for use as a Scanning Election Microscope (SEM) and a Scanning Transmission Electron Microscope (STEM). With the LVEM5 you can switch between imaging modes without moving your sample. This way you can capture both surface and ...
Nanodiscs are discoidal lipid bilayer (blue in the upper schemes) wrapped by two membrane scaffold proteins (MSP, green in upper schemes) in a belt-like configuration parallel to the disc-plane to shield the hydrophobic part of the phospholipids from the aqueous environment. ...
The cover shows that toroidal condensates of duplex DNA can be used as templates for facile preparation of monodisperse nanorings of noble metals. In the work by Zinchenko and co-workers, reported on p. 2820, conformational transition of long DNA chains from elongated coils into compact toroidal condensates changes the manner of reduced silver deposition, from DNA chain metallization with nanoparticles to the formation of silver rings. A one-pot, three-step, simple preparation method leads to formation of well-defined monodisperse silver nanorings (100 nm in diameter) dispersed in water. ...
In the Voelcker lab, we aim to gain a deeper understanding of the interactions between nanostructured materials and human cells and tissues, and their biomolecular products. To that effect, we are developing nanostructured materials and surface chemistries, with a focus on electrochemically etched meso- and macroporous materials. These systems are then optimised for applications in biosensing, drug delivery, regenerative medicine and others.. ...
Because of the edge states and quantum confinement, the shape and size of graphene nanostructures dictate their electrical, optical, magnetic and chemical properties. The current synthesis methods for graphene nanostructures ...
In this work, a rapid, replicable method for imprinting concave nanostructures to be used as functional light-trapping nanostructures in organic thin-films is presented. Porous anodic alumina templates were fabricated both by anodization of thick Al foils and by anodization of submicrometer thin Al films evaporated via e-beam evaporation on Si substrates. The template formation leads to natural patterning of the underlying Al layers that are used as rigid masters for stamp fabrication, after selective etching of the porous anodic alumina. PDMS stamps were made after replicating the Al concave patterns and used for imprinting of spin coated photoresist on glass substrates. We have investigated semi-periodic and aperiodic imprinted large concave patterns fabricated from rigid masters after anodization of Al in H3PO4. We show that metal covered imprinted concaves show enhancement in absorption that is attributed to field enhancement and diffuse scattering, leading to efficient light trapping for a ...
We show that the high-energy ion irradiation of embedded metallic spherical nanoparticles (NPs) is not limited to their transformation into prolate nanorods or nanowires. Depending on their pristine size, the three following morphologies can be obtained: (i) nanorods, (ii) facettedlike, and (iii) almost spherical nanostructures. Planar silica films containing nearly monodisperse gold NPs (8â€"100 nm) were irradiated with swift heavy ions (5 GeV Pb) at room temperature for fluences up to 5Ã-1013 cm-2. The experimental results are accounted for by considering a liquid-solid transformation of the premelted NP surface driven by the in-plane stress within the ion-deformed host matrix. This work demonstrates the interest of using ion-engineering techniques to shape embedded nanostructures into nonconventional configurations ...
Catalysis is a crucial technology for a wide range of applications: it can be considered as one of the most successful applications of nanoscience. Most catalysts, developed predominantly by trail-and-error method, consist of materials with nano-sized features dispersed on a high-surface area support. The current progress in nanoscience could lead to substantially more efficient catalyst development. This session invites theoretical and experimental reports on the development new methods of synthesis, deposition, and processing of novel catalysts.. ...