Conditions of hydrochemical synthesis, composition, and structure of tellurium films

2012 ◽  
Vol 85 (5) ◽  
pp. 731-735 ◽  
Author(s):  
L. N. Maskaeva ◽  
I. V. Zarubin ◽  
E. G. Vovkotrub ◽  
V. F. Markov
Keyword(s):  
Composition And Structure ◽  
Hydrochemical Synthesis ◽  
Synthesis Composition

scholarly journals Precision at the nanoscale: on the structure and property evolution of gold nanoclusters

2018 ◽  
Vol 90 (9) ◽  
pp. 1409-1427 ◽  
Author(s):  
Chenjie Zeng
Keyword(s):  
Rational Design ◽  
Gold Nanoclusters ◽  
Molecular Structures ◽  
Structure And Property ◽  
Transformation Reaction ◽  
Composition And Structure ◽  
Complex Architectures ◽  
Surface Ligand ◽  
Surface Monolayers ◽  
Synthesis Composition

Abstract Chemists are often regarded as “architects”, who are capable of building up complex molecular structures in the ultrasmall-dimensional world. However, compared with organic chemistry, nanochemistry – which deals with nanoparticles in the size range from 1 to 100 nm – is less precise in terms of synthesis, composition, and structure. Such an imprecise nature of nanochemistry has impeded an in-depth understanding as well as rational control of structures and properties of nanomaterials. Motivated by this, thiolate-protected gold nanoclusters (denoted as Aun(SR)m) have recently emerged as a paradigm of atomically precise nanomaterials, in which all the nanoparticles are identical to each other with the same number of core atoms (n) and surface ligands (m) as well as the atomic arrangement. In this review, we provide a demonstration of how the precise nature of Aun(SR)m nanoclusters allows one to understand, decipher and discover some important, enigmatic and intriguing issues and phenomena in nanoscience, including (i) a precise nanoscale transformation reaction induced by surface ligand exchange, (ii) the total structures of crystalline metal phases and the self-assembled surface monolayers, (iii) the periodicities and quantum confinement in nanoclusters and (iv) the emergence of hierarchical complexity in the entire nanoparticle system. We expect that such an in-depth understanding will eventually lead to the rational design and precise engineering of complex architectures at the nanoscale.

Synthesis, Composition, and Structure of Sillenite-Type Solid Solutions in the Bi2O3−SiO2−MnO2System

2011 ◽  
Vol 50 (5) ◽  
pp. 2002-2009 ◽  
Author(s):  
Tatyana I. Mel’nikova ◽  
Galina M. Kuz’micheva ◽  
Victor B. Rybakov ◽  
Nadezhda B. Bolotina ◽  
Alexander B. Dubovsky
Keyword(s):  
Solid Solutions ◽  
Composition And Structure ◽  
Synthesis Composition

scholarly journals Mo–Nb–Si–B Alloy: Synthesis, Composition, and Structure

Metals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 803
Author(s):  
Dmitrii Andreev ◽  
Yurii Vdovin ◽  
Vladimir Yukhvid ◽  
Olga Golosova
Keyword(s):  
Combustion Products ◽  
Centrifugal Acceleration ◽  
Cast Refractory ◽  
Refractory Alloys ◽  
Cast Refractory Alloys ◽  
High Temperature Synthesis ◽  
Composition And Structure ◽  
Wide Range ◽  
Synthesis Composition ◽  
Range Of Values

Cast refractory alloys Mo–Nb–Si–B were prepared by centrifugal self-propagating high-temperature synthesis (SHS) from metallothermic mixtures containing MoO3, Nb2O5, Al, Si, and B powders, and additive of Al2O3 as a temperature-moderating and chemically inert agent. Variation in the centrifugal acceleration and amount of the additive affected the composition and structure of cast Mo–Nb–Si–B alloys. In a wide range of values, the combustion temperature was found to exceed 3000 K, and the combustion products were obtained as two-layer ingots of target Mo–Nb–Si–B alloy (lower) and Al2O3 slag (upper).

scholarly journals Starch Synthesis in Arabidopsis. Granule Synthesis, Composition, and Structure

2002 ◽  
Vol 129 (2) ◽  
pp. 516-529 ◽  
Author(s):  
Samuel C. Zeeman ◽  
Axel Tiessen ◽  
Emma Pilling ◽  
K. Lisa Kato ◽  
Athene M. Donald ◽  
...  
Keyword(s):  
Starch Synthesis ◽  
Composition And Structure ◽  
Synthesis Composition

Modified Sol-Gel Synthesis of Vanadium Oxide Nanocomposites Containing Surfactant Ions, and Their Partial Removal

2000 ◽  
Vol 658 ◽  
Author(s):  
Arthur Dobley ◽  
Peter Y. Zavalij ◽  
Jürgen Schulte ◽  
M. Stanley
Keyword(s):  
Vanadium Oxide ◽  
Transition Metal Oxides ◽  
Sol Gel ◽  
Interlayer Spacing ◽  
Initial Compound ◽  
Structure Changes ◽  
Composition And Structure ◽  
Layered Transition Metal ◽  
Synthesis Composition ◽  
Sol Gel Synthesis

ABSTRACTRecently, there has been much interest in creating new layered transition metal oxides. Vanadium oxides may be used as sorbents, catalysts, and cathodes in lithium batteries. The modified sol-gel technique allows for some control towards the final structure of the compound. Using this technique, a new layered vanadium oxide phosphate material, containing the surfactant dodecylphosphate, has been synthesized. The compound was analyzed using powder XRD, TGA, SEM, FTIR, TEM, and solid state NMR for both 51V and 31P. V2O3(PO4C12H25)3Na2−xKx(H2O)3.2 is the general formula of the layered product with an interlayer spacing of 36.6 Å The initial compound is composed of a vanadium oxide phosphate layer sandwiched between two hydrocarbon layers. The synthesis, composition, and structure of the initial compound will be discussed. Interestingly, when this compound is calcined to 400°C, the structure changes and is possibly hexagonal. Preliminary results are presented on this calcined material.

Modified Sol-Gel Synthesis of Vanadium Oxide Nanocomposites Containing Surfactant Ions

1999 ◽  
Vol 581 ◽  
Author(s):  
Arthur Dobley ◽  
Peter Y. Zavalij ◽  
M. Stanley Whittingham
Keyword(s):  
Vanadium Oxide ◽  
Transition Metal Oxides ◽  
Sol Gel ◽  
Organic Ligand ◽  
Compound I ◽  
Oxide Compound ◽  
Layer Spacing ◽  
Composition And Structure ◽  
Layered Transition Metal ◽  
Synthesis Composition

ABSTRACTRecently, there has been much interest in creating new layered transition metal oxides. Vanadium oxides may be used as sorbents, catalysts, and cathodes in lithium batteries. The modified sol-gel technique allows for some control towards the final structure of the compound. Using this technique, a new layered vanadium oxide compound - I, containing the surfactant dodecylphosphate, has been synthesized. After the removal of the organic ligand a new compound - II is formed which might be hexagonal. The compounds were analyzed using XRD, TGA, SEM, and NMR. VO2PO3(OH)C12H25(H2O)n is the general formula of the layered product I with a layer spacing of about 40 angstroms. II appears to be hexagonal with a = 43Å. The synthesis, composition, and structure of these compounds are discussed.

scholarly journals Iron incorporated in cubic mesoporous silica: synthesis, composition and structure

2008 ◽  
Vol 64 (a1) ◽  
pp. C536-C536
Author(s):  
M.C.A. Fantini ◽  
T.S. Martins ◽  
S.L.A. Maranhao ◽  
M.H. Tabacniks ◽  
L.C. Cides da Silva ◽  
...  
Keyword(s):  
Mesoporous Silica ◽  
Composition And Structure ◽  
Silica Synthesis ◽  
Synthesis Composition ◽  
Cubic Mesoporous

The 3.65 A phase in the system MgO-SiO2-H2O: Synthesis, composition, and structure

2011 ◽  
Vol 96 (8-9) ◽  
pp. 1207-1214 ◽  
Author(s):  
B. Wunder ◽  
R. Wirth ◽  
M. Koch-Muller
Keyword(s):  
Composition And Structure ◽  
Synthesis Composition

scholarly journals Synthesis, Composition and Structure of Complexes of Dialyzed Collagen With CuSO4

2021 ◽  
Author(s):  
Adham Rafikov ◽  
Dildora Sadikova ◽  
Oybek Tursunkulov ◽  
Malika Zubaydullaeva
Keyword(s):  
Phase Analysis ◽  
Salt Content ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Textile Materials ◽  
Composition And Structure ◽  
Ft Ir ◽  
Almost All ◽  
Synthesis Composition ◽  
Ft Ir Spectroscopy

Abstract Coordination complexes of collagen with copper (II) sulfate were synthesized at different ratios of the starting materials. For the synthesis, a collagen solution was used, isolated from the skin of cattle, and then freed from electrolytes by dialysis. With an increase in the salt content, the yield of the reaction product increases. The composition and structure of the complex were determined by FT-IR spectroscopy, SEM, X-ray phase analysis, and differential scanning calorimetry. The complex is formed due to the coordination interaction of with the nitrogen and oxygen atom of collagen and water. An inadequate change in the composition of the complexes with a change in the initial ratio of the components was found. With an excess of collagen, some of it does not bind into a complex and precipitates. With an excess of salt, almost all of the collagen is bound into a complex and a rhombic single crystal is formed. The composition of the complex changes not due to a change in the coordination number , but due to an increase in the amount of these ions. An X-ray phase analysis of the starting materials and complexes has been carried out. The correspondence of the parameters of the crystal structure in the X-ray spectra of the complexes was found for a wide ratio of the starting materials. The synthesized complexes have been successfully used for dyeing textile materials.

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