Aggregation of metal nanoparticles. Medical search. Frequent questions

In collaboration with Peng Wang, Keller and his team have developed a novel class of magnetic nanomaterials, Mag-PCMAs, that can be used to treat water with a wide range of contaminants, including many organic pollutants, oxyanions such as perchlorate, and metals. (wikipedia.org)
Novel sensing electrodes are being created through modifications using conducting polymers and nanomaterials, such as carbon-based nanomaterials, metallic nanoparticles, and metal oxide nanoparticles, in order to improve the selectivity and sensitivity of hydrazine detection. (jchemrev.com)

Herein, a sensitive, simple, and rapid colorimetric assay for the detection of pamidronate disodium was developed based on the aggregation of citrate-capped gold nanoparticles (AuNPs). (sharif.edu)
We report the effect of gold nanoparticles on the sensitivity and selectivity of SnO2-based sensors for detection of CO in the presence of methane and C3H8, a model compound representing liquid petroleum gas (LPG). (sharif.edu)
We report herein the development of a highly sensitive colorimetric method for detection of d-Penicillamine using citrate-capped gold nanoparticles (AuNPs). (sharif.edu)
This assay relies upon the distance-dependent of gold nanoparticles surface plasmon resonance band of gold nanoparticles. (sharif.edu)
By replacing the thiol-containing chelator drug, d-Penicillamine, with citrate on the gold nanoparticles surface, a new peak appearing at a longer wavelength intensifies and shifts further to the red from the original peak position due to aggregation of gold nanoparticles which depends on ionic strength, gold nanoparticles and d-Penicillamine concentration. (sharif.edu)
In this work, an electrochemical DNA biosensor, based on a dual signal amplified strategy by employing a polyaniline film and gold nanoparticles as a sensor platform and enzyme-linked as a label, for sensitive detection is presented. (sharif.edu)
Firstly, polyaniline film and gold nanoparticles were progressively grown on graphite screen-printed electrode surface via electropolymerization and electrochemical deposition, respectively. (sharif.edu)

This leads to the pesticide-induced aggregation and the change of the absorption spectrum of metallic nanoparticles upon high-salt concentrations, which can be monitored with unaided eye or absorbance measurement. (hindawi.com)

We developed polymer-nanoparticle based MMMs with stimuli-responsive pores and high metal adsorption capacity, which allows the subsequent synthesis of metal/metal oxide nanoparticles for catalytic degradation of environmental pollutants in water. (confex.com)
Iron and iron oxide nanoparticles were synthesized directly inside the polymer matrix, which provides added benefits of eliminating the particle aggregation and leaching. (confex.com)
Here, PLA on Cu-Zn alloy rather than on pure Cu in water was used to fabricate (Zn,H)-codoped copper oxide nanoparticles and to study the phase behavior as well as optical property change of the colloidal solution upon dwelling in water. (springer.com)
The main objective is to identify the pathways and mechanisms underlying interactions between metal oxide NPs and eukaryotic cells. (marquette.edu)
Iron oxide nanoparticles functionalized with novel hydrophobic and hydrophilic porphyrins as potential agents for photodynamic therapy. (docksci.com)
Please cite this article as: O. Penon, M.J. Marín, D.B. Amabilino, D.A. Russell, L. Pérez-García, Iron oxide nanoparticles functionalized with novel hydrophobic and hydrophilic porphyrins as potential agents for photodynamic therapy, Journal of Colloid and Interface Science (2015), doi: http://dx.doi.org/10.1016/j.jcis. (docksci.com)
Abstract The preparation of novel porphyrin derivatives and their immobilization onto iron oxide nanoparticles to build up suitable nanotools for potential use in photodynamic therapy (PDT) has been explored. (docksci.com)
To achieve this purpose, a zinc porphyrin derivative, ZnPR-COOH, has been synthesized, characterized at the molecular level and immobilized onto previously synthesized iron oxide nanoparticles covered with oleylamine. (docksci.com)
Chemically active metal oxide surfaces and interfaces ‒such as catalysts, sensors and electrodes‒ play a crucial role in our society and in the development of new technologies. (essenceofescience.se)
We recently developed efficient reactive force-fields to enable large-scale simulations of metal-oxide nanoparticles (2015, upper left picture). (essenceofescience.se)
Zinc oxide (ZnO) nanoparticles (NPs) have been widely investigated for applications in photocatalytic degradation of organic pollutants in wastewater. (biomedcentral.com)
Researchers from EPFL in Switzerland and Technion-Israel Institue of Technology have developed nanoparticle-based α-Fe 2 O 3 (hematite) electrodes that achieve the highest photocurrent of any metal oxide photoanode for photoelectrochemical water-splitting under 100 mW cm −2 air mass, 1.5 global sunlight. (greencarcongress.com)

The Polymeric Matrix Composition of Vibrio cholerae Biofilms Modulate Resistance to Silver Nanoparticles Prepared by Hydrothermal Synthesis. (polymtl.ca)
Introduction: Currently, new methods to reduce biofilm formation on biomaterials are very studied, for example the use of silver nanoparticles, which were bactericidal. (bvsalud.org)
Objective: This study aimed to compare in vitro the Streptococcus mutans biofilm formation on conventional light-cured composite resin with that on experimental light-cured composite resin, modified with silver nanoparticles. (bvsalud.org)
Material and methods: Discs were produced with either conventional resin (control group) and resin modified with different concentrations of silver nanoparticles, 0.1%, 0.3% and 0.6 % wt. (bvsalud.org)
Silver nanoparticles have already been commercially available as an antimicrobial component in parts of household appliances, such as air conditioners, air fresheners, water fresheners, and hair dryers 17,18,26 . (bvsalud.org)
Thus, innovations enabling the control of biofilm growth on such materials have been the aim of many researches, for example, the use of silver nanoparticles and other alternative compounds 4,13,15,25 . (bvsalud.org)
5 evaluated the antimicrobial activity of a resin composite containing silver nanoparticles, at two concentrations, and verified that the amount of adhered bacterial cells was smaller. (bvsalud.org)
1 compared two conventional resin bonding agents with one bonding agent containing silver nanoparticles and also verified that the number of adhered bacterial cells was smaller on the experimental bonding agent. (bvsalud.org)

Heterogeneous catalysts based on supported metal nanoparticles are commonly used in many industrially relevant catalytic reactions. (eurekaselect.com)

The focus of nanoscience is gradually shifting from the synthesis of individual nanoparticles to their organization in larger structures. (eurekalert.org)
Urethane functions can reduce metal salts under hydrothermal conditions: synthesis of noble metal nanoparticles on flexible sponges applied in semi-automated organic reduction. (polymtl.ca)
Synthesis of ultrasmall metal nanoparticles and continuous shells at the liquid/liquid interface in Ouzo emulsions. (polymtl.ca)
Controlling the distribution of nanoparticles in hydrogels via interfacial synthesis. (polymtl.ca)

CeO 2 particle aggregation is observed to occur most facilely at particle contacts with well aligned grain boundaries and in turn these contacts serve as locations of the most significant Pt sintering. (rsc.org)

Under optimized condition, this method showed a low detection limit of 0.4 μM and high selectivity towards Cr(VI) over other metal ions, and the detection range of Cr(VI) was tuned by controlling thickness of the Ag nanoshells. (springeropen.com)

Reconsidering these fundamentals, the assembly behavior, the formation of nonspherical assemblies of nanoparticles and the growth and the corrosion behavior of metal nanoparticles, as well as the formation of core/shell particles, branched structures and particle networks, can be understood. (tu-ilmenau.de)
UCNP are rare-earth metal particles 1-100nm in size with favourable physical properties for a range of applications in pathology and imaging. (ttp.com)
UCNP are luminescent lanthanide-doped rare-earth metal particles that absorb multiple near-infrared (NIR) photons and emit a single photon of higher (or "up-converted") energy. (ttp.com)
Sulfate-reducing bacteria is known to extract metal dissolved in anoxic waters and by isolating it into nanoscale particles. (justchromatography.com)
They report that metal-sulfide nanoparticles produced by these bacteria form aggregates that contain trapped metal-binding polypeptides and proteins, keeping the particles stuck within the biofilm and limiting their dispersion in the environment. (justchromatography.com)
Controlled aggregation of particles into doublets or triplets also produce high enhancements, especially when the SERS molecule can be trapped in the junction between the particles. (nanocomposix.com)
The definition of dose for nanoparticles in an in vitro system is particles in vitro. (cdc.gov)

Silica shelled plasmonic nanoparticles are often used for this barrier layer and custom loading of fluorescent molecules into silica shelled plasmonic nanoparticles is available on request. (nanocomposix.com)

Characterization and Mathematical Modeling of Alginate/Chitosan-Based Nanoparticles Releasing the Chemokine CXCL12 to Attract Glioblastoma Cells. (polymtl.ca)

Understanding the sintering mechanism of platinum-group-metals (PGMs) supported on reducible oxides, such as CeO 2 , is of fundamental and practical importance for the development of durable catalysts. (rsc.org)
Our results suggest that the surface reconstruction during CeO 2 aggregation provides the driving force for Pt sintering and provides new understanding of the sintering mechanism of PGM catalysts. (rsc.org)
In metal alloy catalysts, the driving force for such changes is often derived from differences in the binding strength of an adsorbate to the different metallic components of the alloy. (nature.com)
This review examines the existing literature of several types of the supported-metal nanoparticle heterogeneous catalysts. (eurekaselect.com)
Various studies suggest that chemical reduction, advanced oxidation and electrochemical processes are desired and effective treatment procedure for BPA, which could be activated by using expensive and noble metal catalysts [ 24 ]. (biomedcentral.com)

Current therapeutic strategies for Alzheimer's disease (AD) mainly focus on inhibition of aberrant amyloid -ß peptide (Aß) aggregation. (bvsalud.org)

As a result, the researchers were able to use relatively small ferroelectric nanoparticles (to make sure they do not disturb the orientation of liquid crystals via the creation of defects) at relatively low concentrations (to avoid excessive aggregation and sedimentation of nanoparticles in liquid crystals) that enabled the production of true liquid crystal colloids employed in their experiments. (nanowerk.com)
Halogen ions are commonly found in wastewater, which directly affect the pollutant aggregation and sedimentation, therefore it is necessary to discuss their effect on the photocatalytic degradation. (biomedcentral.com)

With surface modification techniques, ion exchange polymers and reactive nanoparticles have been in-situ synthesized in the commercial microfiltration (MF) membranes for toxic metal and organic remediation from complicated water matrices (surface and groundwater). (confex.com)

For SERS applications, plasmonic nanoparticles with areas of high curvature produce the largest field enhancements (e.g. rod, cubic, pyramidal, or plate geometries). (nanocomposix.com)
Plasmonic nanoparticles with resonance wavelengths from 400 nm to 1000 nm that have ultra-clean bare surfaces ideal for SERS applications are available as stock product and other size and wavelength variants are available as custom orders. (nanocomposix.com)

This picture is valid for the equilibrium state and also during the formation, growth, aggregation or dissolution of nanoparticles. (tu-ilmenau.de)
The potential mechanisms of toxicity of two types of engineered CuO nanoparticles (NPs) to Saccharomyces cerevisiae were investigated and related to distinct physicochemical properties such as size, shape, dissolution, aggregation, and agglomeration. (marquette.edu)

A significant class of toxic pollutants includes heavy metals, fluorinated carbons, and organic and inorganic pollutants [6, 7]. (jchemrev.com)
Aptamer-metal nanoparticle conjugates enables this task due to aptamer specificity against pollutants and aggregation induced color change of metal nanoparticles. (dongguk.edu)
Therefore, this study unveils the role of chloride ions as an effective medium for BPA degradation by ZnO NPs, without aggregation, and provides a novel platform for the treatment of organic pollutants in saline water. (biomedcentral.com)

They have the typical character of metal electrodes with ongoing charge transfer processes on the metal/liquid interface. (tu-ilmenau.de)
In contrast to macroscopic electrodes, the small size of nanoparticles is responsible for significant effects of low numbers of elementary charges and for self-polarization effects as they are known from molecular systems, for example. (tu-ilmenau.de)
Batteries, fuel cells and solar-energy conversion devices have emerged as a class of important technologies that increasingly rely on electrodes derived from nanoparticles. (greencarcongress.com)
For the nanoparticle-based electrodes used in solar energy conversion, structural defects such as grain boundaries define pathways for charge transport by creating potential barriers and by promoting recombination. (greencarcongress.com)
In correlating structure and charge transport with nanometer resolution across micrometer-scale distances, they identified the existence of these "champion" nanoparticle aggregates that are most responsible for the high photoelectrochemical activity of the electrodes. (greencarcongress.com)

Catalytically active Pd nanoclusters inside organic molecular cages avoids aggregation and other problems. (materialstoday.com)

Reaction of 1,4-CHD with AeN''2 gave benzene, N''H, and the metal hydride species N''AeH (or aggregates thereof), which is a catalyst for alkene hydrogenation. (bvsalud.org)
The team, led by Dr. Grätzel and Prof. Avner Rothschild at Technion in Israel, developed an approach for correlating the spatial distribution of crystalline and current-carrying domains in entire nanoparticle aggregates. (greencarcongress.com)

It has been reported that the sintering of PGM nanoparticles occurs simultaneously with the aggregation of CeO 2 nanostructures during high temperature thermal treatment. (rsc.org)
According to the researchers' observations, the self-organization of nanoparticles is an efficient strategy for producing nanostructures with complex, hierarchical architectures. (eurekalert.org)
We developed a new approach that enables a quantitative prediction of the architecture of linear, branched, and cyclic self-assembled nanostructures, their aggregation numbers and size distribution, and the formation of structural isomers. (eurekalert.org)

Lumito, a spin-out from the University of Lund, Sweden, approached TTP to pursue an opportunity to advance histology-based diagnostics using novel nanotechnology based on upconversion nanoparticles (UCNP). (ttp.com)

But they are also prone to self-aggregation and require illumination at wavelengths not commonly used in life science applications. (ttp.com)
Metal nanoparticles support localized surface plasmon resonances, collective oscillations of conduction electrons that strongly couple to light at specific wavelengths and produce extremely high electromagnetic fields near the nanoparticle surface. (nanocomposix.com)

Laser ablation (LA) and spark discharge (SD) techniques are commonly used for nanoparticle (NP) formation. (intechopen.com)

An in situ method has been developed to fabricate gold nanoparticle (Au NP) films on different substrates, regardless of whether they are hydrophilic or hydrophobic surfaces, including glass, 96-well polystyrene plates, and polydimethylsiloxane (PDMS). (nature.com)

Smaller, less complex molecule with a lower affinity to gold nanoparticle surface than citrate. (nanocomposix.com)

Here we develop and apply the principles of their evolution from systems principally for evaluating mechanism dosimetry in vitro and outline an approach for simulation of of toxicity to high-throughput systems for rapid and cost-effective nanoparticle particokinetics in cell culture systems. (cdc.gov)

The findings were published in a report titled "Step-Growth Polymerization of Inorganic Nanoparticles" in the July 9 issue of Science . (eurekalert.org)
Their discovery was significant because it called into question the prevailing wisdom that only metals and inorganic materials could successfully conduct electricity. (jchemrev.com)

accepted October 27, 2006 one of the most significant challenges faced by the regulatory, The rapid growth in the use of in vitro methods for nanoparticle research, and producer communities. (cdc.gov)

For some other reactions, clusters of the catalytically active metal atom are needed to activate chemical bonds and obtain the desired products. (nature.com)

TORONTO, ON - A team of scientists led by Eugenia Kumacheva of the Department of Chemistry at the University of Toronto has discovered a way to predict the organization of nanoparticles in larger forms by treating them much the same as ensembles of molecules formed from standard chemical reactions. (eurekalert.org)
We report on the remarkable similarity between the self-assembly of metal nanoparticles and chemical reactions leading to the formation of polymer molecules. (eurekalert.org)
An image on the right shows the same twin cell under the action of the applied electric field: Ferroelectric nanoparticles (FNP), being aligned by an external electric field, hold liquid crystal (LC) molecules in homeotropic state even when an external electric field attempts to orient a liquid crystal in an orthogonal direction. (nanowerk.com)
As a result, the team was able to observe an inverse guest-host effect: ferroelectric nanoparticles reorient and hold liquid crystal molecules in a direction of the orientation of nanoparticles even when an external electric field attempts to orient a liquid crystal in an orthogonal direction as shown at the right of Figure 1. (nanowerk.com)
Fluorescent molecules near the metal particle surface can also be enhanced and can be protected from photobleaching in an effect known as Surface Enhanced Fluorescence (SEF). (nanocomposix.com)
For SEFS, there is a requirement that the molecules be separated from the metal surface by a fixed amount (typically 5 to 10 nm). (nanocomposix.com)

The electrical properties of nanoparticles can be estimated by basic electrochemical equations. (tu-ilmenau.de)

The processes in the magnetron discharge involving metal atoms and metal clusters are analyzed. (edpsciences.org)
The efficiency of conversion of metal atoms in clusters is found in stationary magnetron discharge. (edpsciences.org)
Also, Pd nanoparticles (NPs) are needed for the methane oxidation reaction, and the decomposition of the NPs into single Pd atoms at high temperatures leads to a drop in reactivity 18 . (nature.com)
This was exploited from the affinity of electron-rich atoms toward the surface of AuNPs, resulting in the aggregation of AuNPs through intermolecular hydrogen bonding interactions. (sharif.edu)

We demonstrate the utility and broad applicability of this technique with measurements of glucose, nickel, and glutathione using three different detection chemistries: enzymatic reactions, metal complexation, and nanoparticle aggregation, respectively. (cdc.gov)

The performed analysis (shows how the experimental conditions are connected with the resulted nanoparticle characteristics in agreement with several previous experiments. (intechopen.com)
The morphological evolution that follows aggregation further obscures the influence of particle size, shape and interfacial characteristics in defining the physical properties of these materials. (greencarcongress.com)

Further dwelling of such nanocondensates in water caused progressive formation of a rice-like assembly of (Zn,H)-codoped tenorite (CuO) nanoparticles with (001), (100), and {111} preferred orientations, (111) tilt boundary, yellowish color, and minimum bandgap narrowing down to ca. 2.7 eV for potential photocatalytic applications. (springer.com)
Cylindrical plasma column expansion and return are shown to govern primary nanoparticle formation in spark discharge, whereas hemispherical shock describes quite well this process for nanosecond laser ablation at atmospheric pressure. (intechopen.com)
The past decade has witnessed great progress in nanoscience - particularly nanoparticle self-assembly - yet the quantitative prediction of the architecture of nanoparticle ensembles and of the kinetics of their formation remains a challenge," she continues. (eurekalert.org)
DFT calculations support formation of a metal hydride species by deprotonation of 1,4-CHD followed by H transfer. (bvsalud.org)
As a result of aggregation under optimum conditions ([NaCl] = 25 mM, [AuNPs] = 3.3 nM and pH 7.0), the color of AuNPs was changed from red to blue and the plasmon band of AuNPs around 520 was decreased along with the formation of a new peak at a longer wavelength in the approximate range of 600 to 700 nm. (sharif.edu)

Experimentalists have discovered that aggregation of octahedral nanoparticles of this material readily occurs (upper right figure). (essenceofescience.se)

In particular, noble-metal NP films have been extensively studied because of their versatility, chemical stability, and unique optical properties stemming from localized surface plasmon resonances, which lead to enormous local, nanoscale optical field enhancements. (nature.com)
Based on the performed calculations, we analyze nanoparticle properties, such as mean size and mean density. (intechopen.com)
Our work paves the way for the prediction of the properties of nanoparticle ensembles and for the development of new design rules for such structures. (eurekalert.org)
Instead, the nanoparticles may exhibit extraordinary magnetism or other changes in their micro and macro properties, Adams explains. (aogr.com)
The current drive to explore non-noble metal nanoparticles (NPs) utilized for the hydrogenation of nitroarenes encourages an extensive study of Ni NPs for their affordable price and magnetic properties. (ncu.edu.tw)
One of the main advantages of working with nanoparticles is the manipulation of their properties by controlling the material, size and shape of the nanocore, and the chemical functionalization with specific ligands, which provides multifunctionality to the nanosystem [6]. (docksci.com)
The results show that polyethylene glycol (PEG) modified black phosphorus crystals (BP) nanoparticles can effectively improve their negative electricity, and have relatively stable photothermal properties. (frontiersin.org)

have also reported a simple one-step method for synthesizing noble-metal NP-embedded free-standing PDMS composite films. (nature.com)
Delicately engineering well-defined noble metal aerogels with favorable structural and compositional features is of vital importance for wide applications. (osti.gov)

New research on sulfate-reducing bacteria may offer good news for bioremediation efforts to clean up acid mine drainages and other environments with high levels of harmful metals. (justchromatography.com)

with the activity increasing with metal size. (bvsalud.org)
The size of the prepared ferroelectric nanoparticles was in the range of 10-20 nm (BaTiO 3 ), 20-60 nm (Sn 2 P 2 S 6 ), 20-50 nm (CuInP 2 S 6 ) and 40-90 nm (SbSI). (nanowerk.com)

Two-dimensional atomically thin layers of the metal gallium - known as gallenene - have been created on silicon substrates. (materialstoday.com)

In order to use nanoparticle ensembles in functional devices such as memory storage devices or optical waveguides, it is important to achieve control of their structure. (eurekalert.org)

As a result, orientational transitions in liquid crystals can be controlled by ferroelectric nanoparticles dispersed in such materials. (nanowerk.com)
These nanoparticle-based materials provide a unique challenge in assessing structure-property relationships because of the disordered arrangement of nanocrystals that results when nanoparticles collide and aggregate. (greencarcongress.com)
The antimicrobial activity of some materials show when nanoparticles are added has been recently demonstrated and largely studied as the new method to allow controlling the microbial biofilm growth on surfaces 8,17,18 . (bvsalud.org)
Chitosan, silver, ZnO and TiO2 nanoparticles have been studied in coatings or incorporated to materials, especially biomaterials and food packages, to obtain products less favorable to microbial proliferation 2,11,16,24 . (bvsalud.org)

17] Petroleum Technology Development Fund (PTDF) Research Group _, Ogolo N, Olafuyi O, Onyekonwu M. Effect of Nanoparticles on Migrating Fines in Formations. (jcepm.com)
Previous research work showed that some organics can promote aggregation of the nanoparticles which induces settling and thus decreased their solubility. (justchromatography.com)

Anatomy1

Chemicals and Drugs16

Analytical, Diagnostic and Therapeutic Techniques and Equipment7

Phenomena and Processes4

Disciplines and Occupations3

Technology, Industry, Agriculture12

Nanomaterials2

Gold nanoparticles7

Metallic nanoparticles1

Oxide12

Silver Nanoparticles8

Catalytic1

Synthesis4

Particle aggregation1

Selectivity1

Particles7

Silica1

Characterization1

Catalysts5

Peptide1

Sedimentation2

Reactive1

Plasmonic2

Dissolution2

Pollutants3

Electrodes5

Organic1

Aggregates2

Nanostructures3

Nanotechnology1

Wavelengths2

Commonly1

Fabricate1

Citrate1

Toxicity1

Inorganic2

Vitro1

Catalytically1

Molecules6

Electrochemical1

Atoms4

Detection1

Characteristics2

Formation5

Occurs1

Properties7

Noble2

Bacteria1

Size2

Substrates1

Functional1

Materials4

Research2