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21.
E. N. Abramova A. M. Khort V. N. Tsygankov A. G. Yakovenko V. I. Shvets 《Doklady Chemistry》2016,467(1):61-63
The role of the etchant ion (HF2)– in the formation of pores in silicon during its etching in hydrofluoric acid solutions has been elucidated. The pore shape, size, and orientation in (100) and (111) silicon substrates have been explained by specific features of the etchant ion (HF2)–. 相似文献
22.
E. N. Abramova A. M. Khort A. G. Yakovenko V. N. Tsygankov E. A. Slipchenko V. I. Shvets 《Doklady Chemistry》2017,477(2):271-273
The effect of the type of Si conductivity on the initiation and formation of pores in silicon samples during electrochemical etching was studied. The difference between the pore formation processes in n- and p-conducting silicon was attributed to the properties and the nature of layers formed in the initial period of etching on the Si surface. A possible composition of the layers formed on the Si surface was proposed considering the chemistry of Si interaction with the etching agent. 相似文献
23.
Pascal S. Engl Alexey Tsygankov Jordan De Jesus Silva Jean-Paul Lange Christophe Copéret Antonio Togni Alexey Fedorov 《Helvetica chimica acta》2020,103(4):e2000035
A high throughput experimentation (HTE) study identified active Ru metathesis catalysts and reaction conditions for the ethenolysis of maleate esters to the respective acrylate esters. Catalysts were tested at various loadings (75–10’000 ppm) and temperatures (30–60 °C) with maleate esters dissolved in toluene (up to ca. 44 wt-%) or neat and at variable partial pressures of ethylene (0.2–10 bar). Ruthenium catalysts containing a PCy3 ligand, such as 1st or 2nd generation Grubbs catalysts, as well as the state-of-the-art catalysts containing cyclic alkyl amino carbene (CAAC) ligands, are generally inferior to Hoveyda–Grubbs 2nd generation catalyst in ethenolysis of maleates. Productive turnover numbers could exceed 1900 if the ethenolysis reaction is performed at low ethylene pressure (0.2–3 bar) and reach 5200 when a polymeric phenol additive was used. Such catalytic performance falls well within the window practiced in industry. Moreover, a crude technoeconomic analysis finds similar production cost for the ethenolysis route and conventional technology, that is, propene oxidation followed by esterification, justifying research to further improve the ethenolysis route. 相似文献
24.
A. I. Savvatimskiy S. V. Onufriev S. A. Muboyajan P. A. Tsygankov 《Bulletin of the Russian Academy of Sciences: Physics》2018,82(4):363-368
Experimental studies of carbides are briefly reviewed. The high-temperature properties of carbides used in nuclear power and aerospace engineering are considered. Temperature is measured from either plane surface emittance or the emittance of thin samples prepared in the form of a melting blackbody model. The following quantities are measured: Joule energy, heat capacity (predominantly Сp), electrical resistance, and phase-transition heat versus temperature (up to 5000 K). The pre-melting heat capacity exceeds the equilibrium value, but temperatures measured at the characteristic points of the phase diagram correspond to the design diagram. 相似文献
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26.
V. M. Ostrovskaya A. V. Tsygankov S. E. Nefedov O. A. Prokopenko E. A. Reshetnyak 《Russian Chemical Bulletin》2006,55(6):1066-1070
An improved procedure was proposed for the synthesis of 3-hydroxy-7,8-benzo-1,2,3,4-tetrahydroquinoline, which is used as
a reagent for the analytical test reaction for nitrate and nitrite anions based on azo coupling with diazo compounds. 3-Hydroxy-6-(R-phenylazo)-7,8-benzo-1,2,3,4-tetrahydroquinolines
(R = 2-COOH, 4-COOH, or 4-SO3H) were synthesized by azo coupling reactions in 65–70% yields. The structures of these compounds were confirmed by elemental
analysis, 1H NMR and IR spectroscopy, and X-ray diffraction. Based on the X-ray data, the bathochromic shift in the UV spectrum of the
o-carboxy isomer compared to the p-carboxy isomer (Δλmax = 50 nm) is attributed to a strong intramolecular hydrogen bond.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 6, pp. 1027–1031, June, 2006 相似文献
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28.
A. N. Kozlov S. A. Zibrov A. A. Zibrov V. I. Yudin A. V. Taichenachev V. P. Yakovlev E. A. Tsygankov A. S. Zibrov V. V. Vassiliev V. L. Velichansky 《Journal of Experimental and Theoretical Physics》2016,122(5):823-831
Magnetic resonance at the Fg = 1 \( \rightleftarrows \)Fe = 1 transition of the D1 line in 87Rb has been studied with pumping and detection by linearly polarized radiation and detection at the double frequency of the radiofrequency field. The intervals of allowed values of the static and alternating magnetic fields in which magnetic resonance has a single maximum have been found. The structure appearing beyond these intervals has been explained. It has been shown that the quadratic Zeeman shift is responsible for the three-peak structure of resonance; the radiofrequency shift results in the appearance of additional extrema in resonance, which can be used to determine the relaxation constant Γ2. The possibility of application in magnetometry has been discussed. 相似文献
29.
V. M. Ostrovskaya A. V. Tsygankov O. A. Prokopenko A. K. Buryak E. A. Reshetnyak N. A. Nikitina 《Journal of Analytical Chemistry》2008,63(8):792-798
RIB-Nitrite-Test and Sorbfil-Nitrite-Test strips were developed for determining nitrite ions in water samples and foodstuffs by a reaction similar to the Griess reaction. Stable and noncarcinogenic 3-hydroxy-7,8-benzo-1,2,3,4-tetrahydroquinoline was used as an azo component adsorbed in the reagent paper zone on a polymeric support or on a Sorbfil plate sealed in a transparent polymeric film. Performance characteristics were evaluated by a statistical method for visual test procedures for the detection and determination of NO 2 ? using two different test strips. The determination limit was 0.54 and 0.09 mg/L, and the detection limit was 0.50 and 0.08 mg/L, respectively. 相似文献
30.