Microscopical structure of the uniaxial and biaxial lyotropic nematics

Journal of Chemical Physics - Tập 87 Số 3 - Trang 1851-1856 - 1987
Y. Galerne1, A. M. Figueiredo Neto2, L. Liébert3
1Laboratoire dé Physique des Solídes, Université Paris Sud, 91405 Orsay Cedex, France
2Instituto de Fisica, Universidade de Saõ Paulo, CP: 20516 CEP: 01498 Saõ Paulo(SP), Brazil
3Laboratoire pour l’Utilisation ḑu Rayonnement Electromagnétique (LURE), Université Paris Sud, 91405 Orsay Cedex, France

Tóm tắt

High-resolution x-ray measurements have been performed at the synchrotron of LURE (Orsay) to study both uniaxial (discotic and calamitic) and biaxial nematic lyomesophases of the mixture K-laurate, 1-decanol, and D2O. The variations of the densitometric profiles of the diffracted bands are analyzed vs temperature. They are shown to be consistent with the model of similar micellar aggregates in the three nematic phases, undergoing different orientational fluctuations. It is moreover discussed that the micelles have, on the average, the shape of biaxial platelets with a (1/2/3) anisotropy, and that they build the same pseudolamellar structure in each nematic phase.

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Thông tin
Thông tin xuất bản

Journal of Chemical Physics

Tập 87 Số 3

1851-1856

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