phases of liquid crystals and their transitions
نویسنده
چکیده
A brief introduction of liquid crystals and their phases is provided in this paper. Liquid crystal is a state of matter which has intermediate prosperities between liquid and crystalline solid. Its phases are characterized by their space and point group symmetry. We'll give a description of the symmetry and characteristics of different phase types of liquid crystals. And then talk about their phase transition. In particular, we'll talk about some interesting theoretical and experimental results for N-I, N-SA and SA-SC transition.
منابع مشابه
The detection of conformational disorder by thermal analysis
Conformational disorder in crystals is found in many molecules that possess a plurality of conformational isomers. Typical examples are linear macromolecules such as polyethylene, polytetrafluoroethylene and trans-1,4-polybutadiene; and small molecules such as paraffins, cycloparaffins, soaps, lipids and many liquid-crystal forming molecules. Conformational motion is often coupled with the coop...
متن کاملX-ray studies of the phases and phase transitions of liquid crystals.
A short review is given of recent X-ray diffraction studies of the phases and phase transitions of thermotropic liquid crystals. The areas covered are twist-grain-boundary phases, antiferroelectric phases studied with resonant X-ray diffraction and smectic phases within gel structures. In all areas, X-ray diffraction has played a key role. Nonetheless, open questions remain: the nature of the s...
متن کاملScanning Tunneling Microscopy Studies of Phase Transitions in Liquid Crystals
The phase transitions of two different liquid crystal materials adsorbed on graphite were studied using scanning tunneling microscopy. From the dimensions, the periodicity and the symmetry of the observed structures at different temperatures, a strong relationship between the bulk phases and the adsorbed monolayer phases was found. In addition, this study shows that the transition temperatures ...
متن کاملA Deformable Gay-Berne Model for the simulation of Liquid Crystals and Soft Materials
We present a Deformable Gay–Berne (DGB) pair potential for ellipsoidal particles that allows for dynamic fluctuations in their shape and interaction anisotropy. We investigate the effect that various intrinsic distributions of shape and interaction parameters have on the liquid crystal phases formed in a system of deformable Gay-Berne particles. We show that deformability can stabilise smectic ...
متن کاملPattern formation in smectic liquid crystal lms
Many initially uniform systems can develop regular patterns of spatial structure when driven su ciently far from equilibrium. In their simplest forms, these patterns resemble soft condensed phases. Pattern formation takes place via instabilities that are the nonequilibrium equivalent of phase transitions. We rst provide a general overview of the study of pattern formation in uid dynamical syste...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2011