Pretransitional effects in isotropic phases close to nematic, nematic discoid and columnar phases
نویسندگان
چکیده
منابع مشابه
Simple theory of transitions between smectic, nematic, and isotropic phases.
The transitions between smectic, nematic, and isotropic phases are investigated in the framework of a unified molecular-statistical approach. The new translational order parameter is different from the one introduced in K. Kobayashi [Phys. Lett. A 31, 125 (1970)] and W. L. McMillan [Phys. Rev. A 4, 1238 (1971)]. The variance of the square sine of intermolecular shift angle along the director is...
متن کاملIsotropic-nematic transition and cholesteric phases of helical Yukawa rods.
We present a Monte Carlo simulation study of helical Yukawa rods as a model for chiral liquid crystal mesogens. To simulate the cholesteric phase, we introduce a new simulation method that uses soft walls and self-determined boundary conditions. We observe that the isotropic-nematic phase transition is shifted to lower volume fractions with decreasing salt concentration as well as with increasi...
متن کاملInduction of chirality in nematic phases
2014 Some electrooptic and thermooptic effects of cholesteric phase are used in liquid crystal visualisation and display systems provided spiral pitch is equal to a visible wavelength or several micrometers. Liquid crystals with cholesteric properties were generally cholesteric esters. Unfortunately these materials are chemically nonstable. More stable nematic liquid crystals twisted by mixing ...
متن کاملReentrant nematic and columnar phases in disc-like liquid crystals at atmospheric pressure
2014 We describe the first example of reentrant ND nematic and Dr columnar mesophases at atmospheric pressure in a pure disc-like compound. J. Physique LETTRES 42 (1981 ) L-417 L-419 15 SEPTEMBRE 1981, Classification Physics Abstracts 61.30 64.70E
متن کاملpH dependent isotropic to nematic phase transitions in graphene oxide dispersions reveal droplet liquid crystalline phases.
Size fractionation, amplified by the surface charge density of graphene oxide (GO) sheets, broadens the pH dependent isotropic (I) to nematic (N) phase transition in aqueous dispersions of graphene oxide (GO). In this biphasic region, a highly organized droplet nematic phase of uniform size (20 ± 2.8 μm diameter) with an isotropic interior is observed.
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal de Physique
سال: 1984
ISSN: 0302-0738
DOI: 10.1051/jphys:01984004503045100