Results 251 to 260 of about 16,570 (284)

Preparation of polyboronphenylsiloxanes by mechanochemical activation

Russian Journal of General Chemistry, 2014
Linear polyboronphenylsiloxanes containing fluorine atom at silicon and acetylacetonate group at boron have been synthesized by mechanochemical activation. Mechanochemical activation of polyphenylsilsesquioxane and boron difluoride acetylacetonate taken in molar ratio 1 : 1 was shown to lead to the formation of polyboronphenylsiloxane with the given Si/
A. A. Kapustina, N. P. Shapkin, V. V. Libanov   +2 more
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Mechanochemically activated synthesis of nanostructured NiFe2O4

Inorganic Materials, 2011
Powdery NiFe2O4 has been obtained by mechanothermal treatment. Nickel and iron hydroxides are used as initial compounds. For comparison the initial compounds are calcinated without mechanical treatment (samples obtained by direct heating). The characterization of the samples is carried out by XRD analysis and Mossbauer spectroscopy.
Z. Cherkezova-Zheleva, V. Blaskov, I. Mitov, D. Klissurski, D. Radev, P. Tsokov   +5 more
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Thermal treatment of mechanochemically activated kaolinite

Thermochimica Acta, 2003
The mechanochemical activation of a high defect kaolinite has been studied using a combination of high-resolution thermogravimetry and DRIFT spectroscopy. The effect of grinding causes a decrease in the dehydroxylation temperature and an increase in the amount of adsorbed/coordinated water.
Horvath, Erzsebet, Frost, Raymond, Makoe, Eva, Kristof, Janos, Cseh, Tamas   +4 more
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Mechanochemically activated nano-aluminium: Oxidation behaviour

Journal of Materials Science, 2004
Nanocrystalline aluminium powder has been prepared by high-energy ball milling of flaked micron-sized aluminium powder in the presence of 10 wt% of graphite under argon atmosphere. The structure and chemical composition of as-prepared nanocomposites and the their thermally induced changes are studied by X-ray diffraction (XRD), transmission electron ...
A. Pivkina, A. Streletskii, I. Kolbanev, P. Ul'yanova, Yu. Frolov, P. Butyagin, J. Schoonman   +6 more
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Mechanochemical activation of methane oxidation catalysis

Catalysis Today, 1992
Abstract Mechanochemical activation of methane oxidation catalysts is used for two aims: 1) for identification of free-radical centres at the oxide surfaces and 2) for preparation of new active catalysts of partial methane oxidation. Kinetics of interaction of free-radical defects at the surface of mechanically activated SiO2 with methane was studied.
O.V. Krylov, A.A. Firsova, A.A. Bobyshev, V.A. Radtsig, D.P. Shashkin, L.Ya. Margolis   +5 more
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Mechanochemical activation of aluminum. 4. Kinetics of mechanochemical synthesis of aluminum carbide

Colloid Journal, 2006
The kinetics of mechanochemical synthesis of aluminum carbide Al4C3 from elements was studied with X-ray diffraction analysis, low-temperature argon adsorption, laser granulometry, chemical analysis, X-ray photoelectron spectroscopy, and electron scanning microscopy.
A. N. Streletskii, I. V. Povstugar, A. B. Borunova, S. F. Lomaeva, P. Yu. Butyagin   +4 more
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Mechanochemical processes with the reaction-induced mechanical activation. Chemo-mechanochemical effect

Russian Chemical Bulletin, 2018
The review addresses the special case of mechanical activation of solid-state chemical reactions when the stress field, strain, and defects in crystals are induced by the chemical reaction itself rather than by the external mechanical impact (chemo-mechanochemical (CMC) effect).
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Thermal analysis of mechanochemically activated glass

Journal of Thermal Analysis and Calorimetry, 2006
Thermal analysis (TG, DTG, DTA, DSC) has been used to study the influence of mechanochemical activation of glass making batch on its melting and obtained glass crystallization. It revealed, that long time (12 h) mechanical treatment accelerates the glass batch melting and also improving network homogeneity influence the internal structure of the ...
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Mechanochemical Instabilities in Active Gels

2009
Stimuli-responsive polymers and their application to smart materials have been widely studied. On the other hand, as a novel bio-mimetic polymer, we have been studying a polymer with an autonomous self-oscillating function by utilizing oscillating chemical reactions.
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Mechanochemical Activation of Small Ring Cyclopolymers

2014
Abstract : With the support of this award, we were able to explore mechanochemical activation of small ring cyclopolymers, which ultimately led to the discovery of flex activated mechanophores. These mechanophores take advantage of bond bending motions induced by polymer chain elongation, rather than more tradition bond stretching modes of activation ...
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