Sullivan D E, Shalaginov A N
Department of Physics and Guelph-Waterloo Physics Institute, University of Guelph, Guelph, Ontario, Canada N1G 2W1.
Phys Rev E Stat Nonlin Soft Matter Phys. 2004 Jul;70(1 Pt 1):011707. doi: 10.1103/PhysRevE.70.011707. Epub 2004 Jul 29.
A Landau theory for surface enhanced ordering in free-standing smectic-A films is described, based on a generalization of de Gennes's "presmectic" model to systems which undergo a first-order smectic-isotropic transition in bulk. As found in related work on phase transitions in thin films, the system exhibits three phases, an isotropic liquid, a bulk-like ordered (smectic-A) phase, and a surface-ordered ("quasismectic") phase. Over much of its range, the temperature-thickness boundary between the bulk-ordered and surface-ordered phases is effectively characterized by a power-law relation similar to those observed for layer-thinning transitions in overheated free-standing smectic-A films.
本文描述了一种关于独立近晶 - A 薄膜中表面增强有序化的朗道理论，该理论基于将德热纳的“预近晶”模型推广到在体相中经历一级近晶 - 各向同性转变的系统。正如在关于薄膜相变的相关工作中所发现的那样，该系统呈现出三个相：各向同性液体相、类似体相的有序（近晶 - A）相和表面有序（“准近晶”）相。在其大部分范围内，体相有序相和表面有序相之间的温度 - 厚度边界有效地由幂律关系表征，这与在过热的独立近晶 - A 薄膜中观察到的层变薄转变的幂律关系相似。
