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- W2183667064 abstract "MESOPHASE–LIKE NATURE OF FORMING GEL YTTRIUM AND ZIRCONIUM OXYHYDRATES Yu.I. Sukharev, T.G. Krupnova, A.A. Lymar e–mail: sucharev@water.susu.ac.ru Southern Ural State University, Chelyabinsk, Russia. The chiral–smectic type of the planar texture of yttrium oxyhydrate gels is found. The spontaneous concentration differentiation of a substance in time and space is observed in colloid gel systems. The differentiation is of autowave (pulsating) nature (periodical selforganization), which takes the form of the so–called «frozen» helical whirls. The optical density of YOHGs depending on the light wavelength reveals rather wide areas with the low optical density of gels (the formation of homeotropic–like structures with the reformation of helical whirls), i.e. the samples became optically transparent in a certain discrete interval of wavelengths. The effect of forming the chiral–smectic type structures explains the colouring of yttrium oxyhydrate gels. Lyotropic mesophases of yttrium oxyhydrate manifest the thermotropic properties. Separation and differentiation of the above thermotropic mesophases is performed at the stage of the gel formation. The phase transitions with the formation of the mesogenetic phases take place at the temperatures of 13, 17, 26 °C. The above temperatures were found to be close to the experimental ones: (13, 17) °C → 19.5 °C, 26 °C → 29.5 °C. The mesophase of zirconium oxyhydrate forming at the temperature of –4 °C (269K) is found. The possible structures of the mesophase’s elementary units are proposed. Work is executed under grant RFBR–Ural (Russian fund of basic researches and administration of the Chelyabinsk region; the project No 01–03–96421)." @default.
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- W2183667064 date "2002-01-01" @default.
- W2183667064 modified "2023-09-27" @default.
- W2183667064 title "MESOPHASE-LIKE NATURE OF FORMING GEL YTTRIUM AND ZIRCONIUM OXYHYDRATES" @default.
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