/ E. M. Aver'yanov> // Phys. Solid State. - 2004. -
Vol. 46,
Is. 8. - P. 1554-1559,
DOI 10.1134/1.1788794. - Cited References: 32
. - ISSN 1063-7834
РУБ Physics, Condensed Matter
Аннотация: The orientational order parameter S of molecules in high-temperature
discotic nematic liquid-crystal phases of triphenylene derivatives is investigated as a function of the length of side flexible molecular chains at different temperatures. It is established that the orientational order parameters S in the range of the transition from the nematic phase to the isotropic liquid phase (the N-D-I transition) are smaller than those predicted from the molecular-statistical theory and computer simulation. It is shown that the N-D-I transition is close to both the isolated Landau point and the tricritical point (regardless of the chemical structure of the molecules and the anisotropy of dispersion intermolecular interactions). Consistent explanations are offered for a number of experimental findings, such as the anomalously small changes in the enthalpy and entropy upon the N-D-I transition (as compared to those revealed upon the N-I transition in calamitic nematic liquid crystals), the anomalously strong response of the isotropic phase of
discotic nematic liquid crystals to external fields (thermodynamically conjugate to the order parameter S) and the long relaxation times of this response, and the formation of cybotactic
discotic molecular clusters in the isotropic phase in the vicinity of the N-D-I transition. (C) 2004 MAIK "Nauka / Interperiodica".
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Держатели документа: Russian Acad Sci, Siberian Div, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation
Доп.точки доступа: Аверьянов, Евгений Михайлович