Hydrogen-bonding and Phase Biaxiality in Nematic Rod-Plate Mixtures
作者:
A.G. Vanakaras,
S.C. Mcgrother,
G. Jackson,
D.J. Photinos,
期刊:
Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals
(Taylor Available online 1998)
卷期:
Volume 323,
issue 1
页码: 199-209
ISSN:1058-725X
年代: 1998
DOI:10.1080/10587259808048442
出版商: Taylor & Francis Group
关键词: Liquid crystals;biaxial nematics;Onsager theory;hydrogen bonding
数据来源: Taylor
摘要:
We study the possibility of using hydrogen-bonding interactions to promote the stabilisation of phase biaxiality in nematic binary mixtures of oblate and prolate thermotropic mesogens. We extend Onsager's theory of the isotropic-nematic transition to allow for such selective associations among unlike species and we use it to calculate the phase diagram of binary mixtures consisting of hard spherocylinders and cut spheres. The results show that directional, short-ranged attractions between rods and discs strongly stabilise the biaxial nematic mixture against demixing and suggest that interactions of hydrogen-bonding type may provide an efficient mechanism for sustaining phase biaxiality in binary mixtures of real thermotropic nematogens. Preliminary Monte Carlo simulations designed to test such predictions are discussed.
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