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Alexey A. Malygin - One of the best experts on this subject based on the ideXlab platform.
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Mechanism of formation of Titanium dioxide crystallites in the reaction of Titanium Tetrachloride with magnesium hydrosilicate nanotubes
Materials Today Chemistry, 2019Co-Authors: I.s. Bodalyov, A. A. Malkov, T. P. Maslennikova, A.a. Krasilin, Alexey A. MalyginAbstract:Abstract Explored herein is the first cycle of atomic layer deposition of Titanium dioxide from Titanium Tetrachloride and water vapours on the nanotubular magnesium hydrosilicate Mg3Si2O5(OH)4, a synthetic analogue of chrysotile. The structure and morphology of the products are characterised by X-ray diffraction, infrared spectroscopy, electron microscopy and nitrogen adsorption measurements. A side reaction between chrysotile and hydrogen chloride is followed by in situ gravimetry. At 150 °C, Titanium Tetrachloride chemisorption is shown to produce a monomolecular layer of Titanium–chlorine groups on the surface of the chrysotile nanotube preserving its original crystal structure. By contrast, at higher temperatures, 300–400 °C, the process is complicated by a secondary interaction including dehydroxylation of the substrate and a reaction of released water with Titanium Tetrachloride to form Titanium dioxide crystallites in the free space between nanotubes. Structural transformations of chrysotile lowering its thermal stability and leading to its dehydroxylation are caused by the action of hydrogen chloride, a by-product of Titanium Tetrachloride chemisorption and Titanium dioxide formation.
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Influence of ZrO_5 treatment temperature on the interaction with Titanium Tetrachloride
Russian Journal of General Chemistry, 2016Co-Authors: A. A. Malkov, K. L. Vasileva, O. V. Al’myasheva, Alexey A. MalyginAbstract:The data on phase and chemical transformations of nanosized zirconium dioxide upon annealing at 25–1300°С are presented. The in situ interaction of Titanium Tetrachloride with nanosized zirconia annealed at 200–800°С has been studied. The revealed regularities of the change of Titanium content and the Cl/Ti ratio in the chemisorbed groups have confirmed that TiCl_4 predominantly reacts with zirconia treated at up to 400°С via the hydroxyl groups to yield the TiCl_4– n fragments. In the case of zirconia treated at higher temperature, the interaction with TiCl_4 involves the coordination-unsaturated Zr^+ and Zr–O^– centers as well.
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Interaction of Titanium Tetrachloride vapors with zirconium dioxide nanocrystals
Russian Journal of Applied Chemistry, 2012Co-Authors: A. A. Malkov, K. L. Vasilyeva, Alexey A. MalyginAbstract:Products of interaction of the surface of zirconium dioxide nanocrystals with Titanium Tetrachloride as a test reagent were studied. The composition and structure of the surface of synthesized products depending on the time of treating the substrate by Titanium chloride vapor were determined by a complex monitoring of both chemical conversions in the gas phase and concentrations of components in the solid-phase matrix with the help of gravimetric “in situ” measurements at various stages of the reaction.
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Interaction of Titanium Tetrachloride with Products of Thermal Decomposition of Basic Magnesium Carbonate
Russian Journal of Applied Chemistry, 2003Co-Authors: S. A. Morozov, A. A. Malkov, Alexey A. MalyginAbstract:The interaction of Titanium Tetrachloride vapor with products formed in thermal decomposition of basic magnesium carbonate in the temperature range 200-800°C was studied.
Yasumasa Hamada - One of the best experts on this subject based on the ideXlab platform.
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remarkable effects of Titanium Tetrachloride in diastereoselective aza diels alder cycloaddition synthesis of s piperazic acid
Tetrahedron Letters, 2005Co-Authors: Kazuishi Makino, Yoshiaki Henmi, Makiko Terasawa, Osamu Hara, Yasumasa HamadaAbstract:Abstract Titanium Tetrachloride-mediated aza Diels–Alder cycloaddition using a chiral diene and an aza dienophile proceeds in highly diastereoselective manner to form a dehydropiperazic acid derivative in high yield, and diastereoselectivity of the reaction depends on the quantity of Titanium Tetrachloride.
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Remarkable effects of Titanium Tetrachloride in diastereoselective aza Diels–Alder cycloaddition: synthesis of (S)-piperazic acid
Tetrahedron Letters, 2005Co-Authors: Kazuishi Makino, Yoshiaki Henmi, Makiko Terasawa, Osamu Hara, Yasumasa HamadaAbstract:Abstract Titanium Tetrachloride-mediated aza Diels–Alder cycloaddition using a chiral diene and an aza dienophile proceeds in highly diastereoselective manner to form a dehydropiperazic acid derivative in high yield, and diastereoselectivity of the reaction depends on the quantity of Titanium Tetrachloride.
Ch Lohitha Rao - One of the best experts on this subject based on the ideXlab platform.
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Titanium Tetrachloride mediated reductive ring opening of c aryl pseudoglycals
Tetrahedron Letters, 2008Co-Authors: Ch Raji Reddy, Balakrishna G Reddy, Ch Lohitha RaoAbstract:Abstract A facile reductive ring opening of C -aryl pseudoglycals is reported for the first time. The combination of Titanium Tetrachloride (Lewis acid) and triethylsilane (reducing agent) at −78 °C in dichloromethane is a mild and efficient reagent system for this transformation. The reagent system was successfully tested on various C -aryl pseudoglycal substrates to yield the corresponding ring opened products containing two asymmetric hydroxyls and a cis -double bond.
Dmitry Rychkov - One of the best experts on this subject based on the ideXlab platform.
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Energy spectrum of surface traps on Teflon ® -FEP films modified with Titanium-Tetrachloride vapor
2016 IEEE International Conference on Dielectrics (ICD), 2016Co-Authors: Dmitry Rychkov, Reimund Gerhard, Alexey Kuznetsov, Andrey RychkovAbstract:In the present paper, we investigate the energy distribution of surface traps on fluoroethylenepropylene copolymer films treated with Titanium-Tetrachloride vapor. The energy spectra were extracted from the thermally stimulated surface-potential-decay data obtained for both non-treated and modified films. Using a model based on a theory by Simmons, we show that the fluoroethylenepropylene copolymer films treated with Titanium-Tetrachloride vapor have considerably deeper traps and exhibit a more complex energy spectrum than the non-modified samples. Possible explanations of the observed phenomena are discussed.
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stabilization of positive charge on polytetrafluoroethylene electret films treated with Titanium Tetrachloride vapor
Applied Physics Letters, 2011Co-Authors: Dmitry Rychkov, R GerhardAbstract:The surface of polytetrafluoroethylene films was treated with Titanium-Tetrachloride vapor. The treatment was carried out in a flow reactor by means of molecular-layer deposition, a method from the arsenal of chemical nanotechnology. X-ray photoelectron spectroscopy reveals that such a treatment results in considerable changes in the chemical composition at and near the surface of the fluoropolymer film. Both, defluorination and oxidation of the surface were observed. At the same time, samples treated with Titanium Tetrachloride show a significant enhancement in the thermal stability of the positive homocharge. The thermally stimulated surface-potential-decay curves were observed to shift to higher temperatures by more than 100 °C
A. A. Malkov - One of the best experts on this subject based on the ideXlab platform.
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Mechanism of formation of Titanium dioxide crystallites in the reaction of Titanium Tetrachloride with magnesium hydrosilicate nanotubes
Materials Today Chemistry, 2019Co-Authors: I.s. Bodalyov, A. A. Malkov, T. P. Maslennikova, A.a. Krasilin, Alexey A. MalyginAbstract:Abstract Explored herein is the first cycle of atomic layer deposition of Titanium dioxide from Titanium Tetrachloride and water vapours on the nanotubular magnesium hydrosilicate Mg3Si2O5(OH)4, a synthetic analogue of chrysotile. The structure and morphology of the products are characterised by X-ray diffraction, infrared spectroscopy, electron microscopy and nitrogen adsorption measurements. A side reaction between chrysotile and hydrogen chloride is followed by in situ gravimetry. At 150 °C, Titanium Tetrachloride chemisorption is shown to produce a monomolecular layer of Titanium–chlorine groups on the surface of the chrysotile nanotube preserving its original crystal structure. By contrast, at higher temperatures, 300–400 °C, the process is complicated by a secondary interaction including dehydroxylation of the substrate and a reaction of released water with Titanium Tetrachloride to form Titanium dioxide crystallites in the free space between nanotubes. Structural transformations of chrysotile lowering its thermal stability and leading to its dehydroxylation are caused by the action of hydrogen chloride, a by-product of Titanium Tetrachloride chemisorption and Titanium dioxide formation.
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Influence of ZrO_5 treatment temperature on the interaction with Titanium Tetrachloride
Russian Journal of General Chemistry, 2016Co-Authors: A. A. Malkov, K. L. Vasileva, O. V. Al’myasheva, Alexey A. MalyginAbstract:The data on phase and chemical transformations of nanosized zirconium dioxide upon annealing at 25–1300°С are presented. The in situ interaction of Titanium Tetrachloride with nanosized zirconia annealed at 200–800°С has been studied. The revealed regularities of the change of Titanium content and the Cl/Ti ratio in the chemisorbed groups have confirmed that TiCl_4 predominantly reacts with zirconia treated at up to 400°С via the hydroxyl groups to yield the TiCl_4– n fragments. In the case of zirconia treated at higher temperature, the interaction with TiCl_4 involves the coordination-unsaturated Zr^+ and Zr–O^– centers as well.
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Interaction of Titanium Tetrachloride vapors with zirconium dioxide nanocrystals
Russian Journal of Applied Chemistry, 2012Co-Authors: A. A. Malkov, K. L. Vasilyeva, Alexey A. MalyginAbstract:Products of interaction of the surface of zirconium dioxide nanocrystals with Titanium Tetrachloride as a test reagent were studied. The composition and structure of the surface of synthesized products depending on the time of treating the substrate by Titanium chloride vapor were determined by a complex monitoring of both chemical conversions in the gas phase and concentrations of components in the solid-phase matrix with the help of gravimetric “in situ” measurements at various stages of the reaction.
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Interaction of Titanium Tetrachloride with Products of Thermal Decomposition of Basic Magnesium Carbonate
Russian Journal of Applied Chemistry, 2003Co-Authors: S. A. Morozov, A. A. Malkov, Alexey A. MalyginAbstract:The interaction of Titanium Tetrachloride vapor with products formed in thermal decomposition of basic magnesium carbonate in the temperature range 200-800°C was studied.
