IR chemical lasers: Active medium formation via the combustion of finely disperse metal particles in an oxidizing atmosphere

This paper presents a modification of biodegradable polymers with highly-disperse metals, for example Fe/FeO or Fe2O3 (Z), with nano-sized particles. During the course of the work, biodegradable polyethylene composites with the composition PE-276 + Z + starch (Z = 0.1% by wt, starch from 2.5 to 10% by wt) were produced. Studies were made of the rheological and deformation/strength characteristics of the composites produced. A regular relationship was identified between the rate and extent of biodegradation and the percentage starch content in the composites.

Download Full-text

Sintering of Pt/Al2O3 reforming catalysts: EXAFS study of the behavior of metal particles under oxidizing atmosphere

Catalysis Letters ◽

10.1007/bf00770989 ◽

1992 ◽

Vol 13 (3) ◽

pp. 175-188 ◽

Cited By ~ 32

Author(s):

A. Borgna ◽

F. Le Normand ◽

T. Garetto ◽

C. R. Apesteguia ◽

B. Moraweck

Keyword(s):

Metal Particles ◽

Oxidizing Atmosphere ◽

Reforming Catalysts ◽

Exafs Study

Download Full-text

Formation Of Active Medium For IR And Visible Chemical Lasers During The Combustion Of Finely Dispersed Metal Particles In The Oxidizer

10.1117/12.950555 ◽

1989 ◽

Author(s):

B. D. Barmashenko ◽

V. A. Kochelap ◽

L. Y. Mel'nikov

Keyword(s):

Active Medium ◽

Metal Particles

Download Full-text

Use of Highly-Disperse Metal Particles in Elastomer Composites

International Polymer Science and Technology ◽

10.1177/0307174x1103800407 ◽

2011 ◽

Vol 38 (4) ◽

pp. 29-34 ◽

Cited By ~ 2

Author(s):

I.P. Petriuk ◽

A.E. Mikhailiuk ◽

I.A. Novakov ◽

V.F. Kablov

Keyword(s):

Metal Particles ◽

Disperse Metal ◽

Elastomer Composites

Download Full-text

Polyfunctional Anion Exchangers on the Basis of Allyl Compounds, Glyсydilic Ethers of Dioxybenzenes and Some Di- and Polyamines

Eurasian Chemico-Technological Journal ◽

10.18321/ectj383 ◽

2016 ◽

Vol 3 (1) ◽

pp. 37

Author(s):

E.E. Ergozhin ◽

A.K. Chalov ◽

B.A. Mukhitdinova ◽

R.A. Iskakova

Keyword(s):

Composite Materials ◽

Scientific Basis ◽

Metal Particles ◽

Process Performance ◽

Anion Exchangers ◽

Disperse Particles ◽

Finely Disperse ◽

Mineral Adsorbents ◽

Allyl Compounds ◽

Process Mode

Scientific basis for preparation of new carbon-mineral adsorbents, supports, highly selective catalysts, and composite materials synthesized by a carbide cycle mechanism on the finely disperse particles of the iron subgroup metals, their alloys with some other metals is discussed. It was found that the carbide cycle mechanism involves the chemical and physical steps. The regularities of the process performance on the both stages are considered. Graphite filaments may be formed of graphite layers with either coaxial-cylindrical, coaxial-conic or stack orientations in the filament body. A number of primary and secondary properties of the graphite aggregates is being discussed. We have developed the methods for control the synthesis of carbon-mineral materials of the specified properties by varying the parameters of the metal particles, the nature of hydrocarbon decomposition, and the process mode.

Download Full-text

Finely dispersed metal particles as the active medium of metal atom lasers

Soviet Journal of Quantum Electronics ◽

10.1070/qe1979v009n12abeh009930 ◽

1979 ◽

Vol 9 (12) ◽

pp. 1562-1564

Author(s):

Evgenii B Gordon ◽

V G Egorov ◽

V S Pavlenko

Keyword(s):

Active Medium ◽

Metal Atom ◽

Metal Particles ◽

Atom Lasers

Download Full-text

Electron Microscopy of the Shape of Small Metal Particles

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100079024 ◽

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.

Download Full-text

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

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100174527 ◽

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.

Download Full-text

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

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100174382 ◽

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.

Download Full-text