首页 | 本学科首页   官方微博 | 高级检索  
     检索      


Two-dimensional chiral model for liquid crystals, bent hard needles: a Monte Carlo simulation
Authors:Peón Jorge  Saucedo-Zugazagoitia Jimena  Pucheta-Mendez Fabian  Perusquía Raúl A  Sutmann Godehard  Quintana-H Jacqueline
Institution:Instituto de Química, Universidad Nacional Autónoma de México, México 04510 Distrito Federal, México.
Abstract:The liquid crystalline behavior of a two dimensional (2D) model of hard needles bent into a "zigzag shape" is studied. This model, originally designed to study two dimensional chiral segregation, also shows liquid crystalline behavior and has some anomalous features which are contrasted in relation to the following: (i) Most of the microscopical models used to study liquid crystals have a symmetry axis that coincides with a molecular axis; (ii) in three-dimensions, chiral molecules can form cholesteric instead of nematic phases; (iii) the smectic phase is usually found when attractions are present or at least when the molecules have finite volume. Despite the fact that the present 2D model does not have any of these characteristics, numerical evidence is found for the occurrence of nematic and smectic phases. Since these molecules are athermal, infinitely repulsive, and infinitesimally thin, the liquid crystalline characteristics are attributed to excluded volume effects. To determine the mesophases of the model, both nematic and smectic order parameters as well as distribution functions are computed.
Keywords:
本文献已被 PubMed 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号