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61.
S. V. Pasechnik V. G. Chigrinov Corresponding author D. V. Shmeliova V. A. Tsvetkov A. N. Voronov 《Liquid crystals》2013,40(4):585-592
We propose a new optical method and the experimental set-up for measuring the anisotropic shear viscosities of nematic liquid crystals (LCs). LC shear viscosities can be optimized to improve liquid crystal display (LCD) response times, e.g. in vertical aligned nematic (VAN) or bistable nematic displays (BND). In this case a strong back-flow effect essentially determines the LCD dynamic characteristics. A number of shear viscosity coefficients defines the LCD response time. The proposed method is based on the special type of a shear flow, namely, the decay flow, in the LC cell with suitably treated substrates instead of magnetic or electric field application. A linear regime of a quasi-stationary director motion induced by a pressure difference and a proper configuration of a LC cell produces decay flow conditions in the LC cell. We determine three principal shear viscosity coefficients by measuring relative time variations of the intensity of the light passed through LC cells. The shear viscosity coefficient measurements provide a new opportunity for the development of new LC mixtures with fast response times in VAN, BND and other important LCD types. 相似文献
62.
Baulina T. V. Kudryavtsev I. Yu. Artem’ev A. V. Bagryanskaya I. Yu. Pasechnik M. P. Brel V. K. 《Russian Journal of General Chemistry》2020,90(10):1840-1844
Russian Journal of General Chemistry - New tripodal ligand, tris(2-carbamoylmethoxyphenyl)phosphine oxide, has been synthesized via the alkylation of tris(2-hydroxyphenyl)phosphine oxide with... 相似文献
63.
I. Yu. Kudryavtsev T. V. Baulina M. P. Pasechnik R. R. Aisin S. V. Matveev P. V. Petrovskii E. E. Nifant’ev 《Russian Chemical Bulletin》2013,62(4):1086-1090
Tris(2-cyanomethoxyphenyl)phosphine oxide was synthesized by the reaction of tris-(2-hydroxyphenyl)phosphine oxide with chloroacetonitrile. Its coordination properties were studied for the complexation with neodymium(iii) and copper(ii) nitrates using vibrational spectroscopy, NMR, and quantum chemical calculations. 相似文献
64.
E. I. Goryunov G. V. Bodrin I. B. Goryunova Yu. V. Nelyubina P. V. Petrovskii T. V. Strelkova A. S. Peregudov A. G. Matveeva M. P. Pasechnik S. V. Matveev E. E. Nifant’ev 《Russian Chemical Bulletin》2013,62(3):780-791
The reactions of diphenyl(diisopropyl)chlorophosphine with arylidene(heteroarylidene)-acetones and 3-benzylidenepentane-2,4-dione in the presence of acetic acid proceed at a high rate at room temperature to afford the corresponding β-diorganylphosphorylated alkanones and alkanediones in high yields. The reaction of diphenylchlorophosphine with 4-methoxybut-3-en-2-one and dibenzylideneacetone carried out under similar conditions at the equimolar reagent ratio can serve as a convenient method for the synthesis of unique β-diphenylphosphorylalkenones. The structures of compounds obtained were established by IR, Raman, and NMR spectroscopy and X-ray diffraction. 相似文献
65.
S. V. Pasechnik V. G. Chigrinov D. V. Shmeliova V. A. Tsvetkov A. N. Voronov 《Liquid crystals》2004,31(4):585-592
We propose a new optical method and the experimental set-up for measuring the anisotropic shear viscosities of nematic liquid crystals (LCs). LC shear viscosities can be optimized to improve liquid crystal display (LCD) response times, e.g. in vertical aligned nematic (VAN) or bistable nematic displays (BND). In this case a strong back-flow effect essentially determines the LCD dynamic characteristics. A number of shear viscosity coefficients defines the LCD response time. The proposed method is based on the special type of a shear flow, namely, the decay flow, in the LC cell with suitably treated substrates instead of magnetic or electric field application. A linear regime of a quasi-stationary director motion induced by a pressure difference and a proper configuration of a LC cell produces decay flow conditions in the LC cell. We determine three principal shear viscosity coefficients by measuring relative time variations of the intensity of the light passed through LC cells. The shear viscosity coefficient measurements provide a new opportunity for the development of new LC mixtures with fast response times in VAN, BND and other important LCD types. 相似文献
66.
A linear dependence of the output voltage of an acoustic thermometer on the temperature difference between the source and the piezoelectric transducer is demonstrated experimentally. The constant component of the output voltage is determined by the noise temperature of the receiving device. The main feature of the thermal acoustic radiation as a source of acoustic signals is that the signal is represented not by the total thermal radiation of the object, which is proportional to the absolute temperature of the latter, but by the part of this radiation that is proportional to the temperature difference between the object and the transducer. 相似文献
67.
Cuypers Hans; Kasikova Anna; Pasechnik Dmitrii V. 《Journal London Mathematical Society》1996,54(1):16-24
The groups McL, Co3 and 2 x Co3 are all contained in the automorphismgroup of a 2-, respectively, 3-fold extension of a generalizedhexagon of order (4,1). We give a geometric characterizationof these multiple extensions of this generalized hexagon. 相似文献
68.
Pasechnik L. A. Shirokova A. G. Koryakova O. V. Sabirzyanov N. A. Yatsenko S. P. 《Russian Journal of Applied Chemistry》2004,77(7):1070-1073
The behavior of scandium compounds in going from alkaline solutions to carbonate and hydrocarbonate solutions was studied. The possibility of coprecipitation of scandium(III) complex carbonate with zinc oxide was examined. 相似文献
69.
Igor Yu. Kudryavtsev Tat’yana V. Baulina Margarita P. Pasechnik Sergei V. Matveev Anna G. Matveeva 《Phosphorus, sulfur, and silicon and the related elements》2014,189(7-8):946-962
AbstractA new tripodal O-donor ligand, tris(2-N,N-dibutylcarbamoylmethoxyphenyl)phosphine oxide (L), was synthesized. This potentially tetradentate ligand L exhibits variable denticity upon complexation with UO2(NO3)2, Nd(NO3)3, and Lu(NO3)3. The complexes were studied by elemental analysis, IR, and 1H, 13C, and 31P NMR spectroscopy.[Supplementary materials are available for this article. Go to the publisher's online edition of Phosphorus, Sulfur, and Silicon and the Related Elements for the following free supplemental files: Additional text, tables, and figures.] 相似文献
70.
S. V. Pasechnik D. V. Shmeliova A. V. Dubtsov V. G. Chigrinov Jiatong Sun 《Molecular Crystals and Liquid Crystals》2015,611(1):81-93
The modified method for shear viscosity measurements of nematic liquid crystals (NLC) oriented by surfaces is described. The main modification is concerned with usage of photoalignment technique for preparation of mono-domain samples with an orientation controlled by a polarization state of the secondary light irradiation. It provides the azimuthal rotation of a sample at any desirable angle. Thus different geometries of shear flows can be realized after filling the measuring cell with a liquid crystal. The method is experimentally approved at investigation of Poiseuille decay flows of 4-pentyl-4-cyanobiphenyl (5CB) through the channels with a rectangular cross section. The proposed construction of the cell with different surface treatment provides measurements of the three principal viscosities coefficients (Miesowicz’ viscosities) with additional usage of electric field. A small amount (less than 0.2 ml) of a liquid crystal needed for measurements and simple measuring procedure makes the method to be useful for rheological studies of newly synthesised liquid crystal materials. 相似文献