Preparation of coating films doped with gold metal particles from methyltriethoxysilane-tetraethoxysilane solutions

1994 ◽  
Vol 1 (3) ◽  
pp. 305-318 ◽  
Author(s):  
Plinio Innocenzi ◽  
Hiromitsu Kozuka ◽  
Sumio Sakka
Keyword(s):  
Metal Particles ◽  
Coating Films ◽  
Gold Metal Particles ◽  
Gold Metal

Oxidation of gold metal particles supported on TiO2: an FTIR study by means of low-temperature CO adsorption

2007 ◽  
Vol 42 (10) ◽  
pp. 3299-3306 ◽  
Author(s):  
Hr. Klimev ◽  
K. Fajerwerg ◽  
K. Chakarova ◽  
L. Delannoy ◽  
C. Louis ◽  
...  
Keyword(s):  
Low Temperature ◽  
Co Adsorption ◽  
Metal Particles ◽  
Ftir Study ◽  
Gold Metal Particles ◽  
Gold Metal

scholarly journals Green Synthesis of Gold Nanoparticles Using Pomegranate Peel Extract and Its Antioxidant and Anticancer Activity against Liver Cancer Cell Line

2020 ◽  
Vol 35 (2) ◽  
pp. 164-169
Author(s):  
S. Rajeshkumar ◽  
T. Lakshmi ◽  
M. Tharani ◽  
P. Sivaperumal
Keyword(s):  
Gold Nanoparticles ◽  
Cell Line ◽  
Cancer Cell Line ◽  
Visible Range ◽  
Pomegranate Peel ◽  
Uv Visible ◽  
Pomegranate Peel Extract ◽  
Gold Metal Particles ◽  
Gold Metal ◽  
Peel Extract

Decrease of gold metal particles in contact with the watery strip concentrate of pomegranate organic product finishes the bio-union of gold nanoparticles. At the frequency scope of 350-700nm, an assimilation pinnacle of the biosynthesized gold nanoparticles is noticed. At 530nm, the UV-Visible range of gold nanoparticles orchestrated by pomegranate strip remove shows most extreme pinnacle assimilation. SEM has contemplated the morphological qualities of gold nanoparticles, affirming the round type of gold nanoparticles and their size of around 16nm. The essential investigation of gold nanoparticles blended by pomegranate strip remove has a gold level of 59.90 percent by weight. The gold nanoparticles combined by pomegranate strip extricate showed high cell reinforcement action. The examination shows that orchestrated gold nanoparticles exhibit conceivable anticancer action to build the grouping of gold nanoparticles against the HepG-2 liver malignant growth cell line.

Electron Microscopy of the Shape of Small Metal Particles

1977 ◽  
Vol 35 ◽  
pp. 300-301
Author(s):  
M. Jose Yacaman
Keyword(s):  
Electron Microscopy ◽  
Metal Particle ◽  
Field Experiments ◽  
Size Range ◽  
Dark Field ◽  
Metal Particles ◽  
Bragg Condition ◽  
Crystal Particle ◽  
Small Metal Particle ◽  
Small Metal Particles

In the Study of small metal particles the shape is a very Important parameter. Using electron microscopy Ino and Owaga(l) have studied the shape of twinned particles of gold. In that work electron diffraction and contrast (dark field) experiments were used to produce models of a crystal particle. In this work we report a method which can give direct information about the shape of an small metal particle in the amstrong- size range with high resolution. The diffraction pattern of a sample containing small metal particles contains in general several systematic and non- systematic reflections and a two-beam condition can not be used in practice. However a N-beam condition produces a reduced extinction distance. On the other hand if a beam is out of the bragg condition the effective extinction distance is even more reduced.

Structure and composition of metal particles in Pt-Sn/Al2O3 bimetallic catalysts

1990 ◽  
Vol 48 (4) ◽  
pp. 278-279
Author(s):  
A. Sachdev ◽  
J. Schwank
Keyword(s):  
Bimetallic Catalysts ◽  
Bimetallic Catalyst ◽  
Size Structure ◽  
High Surface ◽  
High Surface Area ◽  
Metal Particles ◽  
Alloy Formation ◽  
Particle Size Range ◽  
Oxide Supports ◽  
Petroleum Fractions

Platinum - tin bimetallic catalysts have been primarily utilized in the chemical industry in the catalytic reforming of petroleum fractions. In this process the naphtha feedstock is converted to hydrocarbons with higher octane numbers and high anti-knock qualities. Most of these catalysts contain small metal particles or crystallites supported on high surface area insulating oxide supports. The determination of the structure and composition of these particles is crucial to the understanding of the catalytic behavior. In a bimetallic catalyst it is important to know how the two metals are distributed within the particle size range and in what way the addition of a second metal affects the size, structure and composition of the metal particles. An added complication in the Pt-Sn system is the possibility of alloy formation between the two elements for all atomic ratios.

Investigation of cluster layers of small netal particles by TEM, SEM, EELS and by photoacoustic spectroscopy

1990 ◽  
Vol 48 (4) ◽  
pp. 250-251
Author(s):  
H. Seiler ◽  
U. Haas ◽  
K.H. Körtje
Keyword(s):  
Bulk Material ◽  
High Vacuum ◽  
Optical Methods ◽  
Metal Particles ◽  
Silver Particles ◽  
Low Loss ◽  
Plasmon Excitation ◽  
First Results ◽  
Diffraction Patterns ◽  
Small Metal Particles

The physical properties of small metal particles reveal an intermediate position between atomic and bulk material. Especially Ag has shown pronounced size effects. We compared silver layers evaporated in high vacuum with cluster layers of small silver particles, evaporated in N2 at a pressure of about 102 Pa. The investigations were performed by electron optical methods (TEM, SEM, EELS) and by Photoacoustic (PA) Spectroscopy (gas-microphone detection).The observation of cluster layers with TEM and high resolution SEM show small silver particles with diameters of about 50 nm (Fig. 1 and Figure 2, respectively). The electron diffraction patterns of homogeneous Ag layers and of cluster layers are similar, whereas the low loss EELS spectra due to plasmon excitation are quite different. Fig. 3 and Figure 4 show first results of EELS spectra of a cluster layer of small silver particles on carbon foil and of a homogeneous Ag layer, respectively.

Coherent electron nanodiffraction from clean silver nano particles in a UHV STEM

1993 ◽  
Vol 51 ◽  
pp. 1058-1059
Author(s):  
J. Liu ◽  
M. Pan ◽  
G. E. Spinnler
Keyword(s):  
Supported Catalysts ◽  
Imaging Techniques ◽  
Nano Particles ◽  
Metal Particles ◽  
Shape Structure ◽  
Dynamical Simulations ◽  
Small Metal Particles ◽  
Extract Information

Small metal particles have peculiar chemical and physical properties as compared to bulk materials. They are especially important in catalysis since metal particles are common constituents of supported catalysts. The structural characterization of small particles is of primary importance for the understanding of structure-catalytic activity relationships. The shape and size of metal particles larger than approximately 5 nm in diameter can be determined by several imaging techniques. It is difficult, however, to deduce the shape of smaller metal particles. Coherent electron nanodiffraction (CEND) patterns from nano particles contain information about the particle size, shape, structure and defects etc. As part of an on-going program of STEM characterization of supported catalysts we report some preliminary results of CEND study of Ag nano particles, deposited in situ in a UHV STEM instrument, and compare the experimental results with full dynamical simulations in order to extract information about the shape of Ag nano particles.

Sign in / Sign up

Export Citation Format

Share Document