Results 281 to 290 of about 3,380,404 (320)

Probing Au Nanoparticle Uptake by Enzyme Following the Digestion of a Starch−Au−Nanoparticle Composite

Langmuir, 2008
In this letter, we report on the digestion of starch, when present as a composite with Au nanoparticles (NPs), by alpha-amylase. It has been observed that the rate of digestion of free starch and that in the composite were identical. Also, the well-established iodine test could be carried out to investigate the kinetics in the presence of Au NPs.
Jashmini, Deka, Anumita, Paul, A, Ramesh, Arun, Chattopadhyay   +3 more
openaire   +2 more sources

Dynamic transverse susceptibility in Au–Fe–Au nanoparticles

Materials Science and Engineering: A, 2001
A precision radio-frequency (RF) transverse modulation technique based on a resonant tunnel diode oscillator (TDO) has been used to study the dynamic transverse susceptibility in novel single domain Fe nanoparticles synthesized using reverse-micelle chemistry. The RF data exhibits peaks at characteristic anisotropy fields.
H. Srikanth, E.E. Carpenter, L. Spinu, J. Wiggins, W.L. Zhou, C.J. O’Connor   +5 more
openaire   +1 more source

Coalescence of Au Nanoparticles without Ligand Detachment

Physical Review Letters, 2020
Repulsion of ligands is known as the key factor for hindering nanoparticle (NP) coalescence. Thus, during the past decade, it has generally accepted that the full removal of capping ligands of the contact surface is the first step for NP coalescence. Herein, using molecular dynamics simulations, we have identified a new mechanism for the coalescence of
Pan Guo, Yi Gao
openaire   +2 more sources

Catalytic activity of Au nanoparticles

Nano Today, 2007
Au is usually viewed as an inert metal, but surprisingly it has been found that Au nanoparticles less than 3–5 nm in diameter are catalytically active for several chemical reactions. We discuss the origin of this effect, focusing on the way in which the chemical activity of Au may change with particle size.
Britt Hvolbæk, Ton V.W. Janssens, Bjerne S. Clausen, Hanne Falsig, Claus H. Christensen, Jens K. Nørskov   +5 more
openaire   +1 more source

Oxygen chemisorption on Au nanoparticles

Chemical Physics Letters, 2003
Abstract Oxygen molecules do not adsorb on flat gold surfaces at room temperature, but recent experimental results have demonstrated adsorption of oxygen on small, negatively charged gold nanoparticles. Here we report first-principles density functional calculations of oxygen adsorption on neutral and charged Au n nanoparticles.
A. Franceschetti, S.J. Pennycook, S.T. Pantelides   +2 more
openaire   +1 more source

Surface magnetism of Au nanoparticles

Journal of Magnetism and Magnetic Materials, 2007
We demonstrate ab initio calculation of electronic structure in Au ultrathin slabs and nanoparticles. The ferromagnetism is not favorable to Au surfaces because the magnetic moments are very small for the surface atoms. However, the d electron states shifts toward the Fermi level for the slab and particle structures. In particular, the d states appears
M. Nawate, H. Tanaka, S. Honda
openaire   +1 more source

Dewetting of Au nanoparticle assemblies

Journal of Materials Chemistry, 2011
Atomic force microscopy measurements as a function of annealing temperature, time of exposure to a high relative humidity environment, and scan duration/parameters have been used to ascertain the stability of assemblies of thiol-passivated Au nanoparticles on silicon substrates. Striking changes in the morphology of self-organised nanoparticle patterns
Alhummiany, Haya, Jarvis, Samuel, Woolley, Richard A. J., Stannard, Andrew, Blunt, Matthew, Moriarty, Philip   +5 more
openaire   +1 more source

Au Nanoparticle Based Biosensing Platform

ECS Meeting Abstracts, 2008
Abstract not Available.
C.R. Raj, Ashok Kumar Das
openaire   +1 more source

Hydrophobic Dendrimers as Templates for Au Nanoparticles

Langmuir, 2005
We report the synthesis, characterization, and extraction of Au dendrimer-encapsulated nanoparticles (DENs) prepared in organic solvents. DENs composed of 31 and 55 Au atoms were prepared using organic solvents and poly(amidoamine) (PAMAM) dendrimer templates modified on their periphery with dodecyl groups.
Marc R, Knecht, Joaquin C, Garcia-Martinez, Richard M, Crooks   +2 more
openaire   +2 more sources

Au Nanoparticles in Electroanalysis

2010
The review presents an overview on the use of electrode surfaces modified by Au nanoparticles in electroanalysis. These devicesresult very promising for the development of amperometric sensors and biosensors capable to quantify different inorganic,organic and biological analytes with extraordinary high sensitivity and low detection ...
ZANARDI, Chiara, TERZI, Fabio
openaire   +2 more sources