EFFECT OF ELECTROSTATIC INTERACTION ON THE LIQUID-CRYSTAL PHASE-TRANSITION IN SOLUTIONS OF RODLIKE POLYELECTROLYTES
EFFECT OF ELECTROSTATIC INTERACTION ON THE LIQUID-CRYSTAL PHASE-TRANSITION IN SOLUTIONS OF RODLIKE POLYELECTROLYTES
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DOI：
10.1021/ma00162a020
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发表时间：
1986-08-01
期刊：
影响因子：
5.5
通讯作者：
ODIJK, T
中科院分区：
文献类型：
--
作者：
STROOBANTS, A;LEKKERKERKER, HNW;ODIJK, T
结果表明，静电相互作用对棒状聚电解质溶液中液晶相转变的影响可用两个参数来表征，一个参数描述了有效直径的增加，另一个参数描述了扭转作用。这些参数对电荷密度和盐浓度的依赖关系进行了研究，无论是弱电荷的聚电解质，适用于德拜-休克尔近似，和forhighly带电的聚电解质，其中充分的泊松-玻尔兹曼方程必须使用。各向同性相变不能像以前那样仅仅用有效直径来描述，还必须考虑扭转效应。这种效应增强了跃迁时的浓度，对于弱电荷的聚离子尤其明显.
It is shown that the effect of electrostatic interactions on the liquid crystal phase transition in solutions of rodlike polyelectrolytes can be characterized by two parameters, one describing the increase of the effective diameter and the other the twisting action. The dependence of these parameters on the charge density and the salt concentration is studied both for weakly charged polyelectrolytes, for which the De-bye-Hückel approximation applies, and forhighly charged polyelectrolytes, for which the full Poisson-Boltzmann equation has to be used. The isotropic-nematic phase transition cannot be described solely in terms of an effective diameter as has always been done before but one must also take the twisting effect into account. This effect, which enhances the concentrations atthe transition, is particularly marked for weakly charged poly ions.