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arXiv physics/0512130physics.chem-phphysics.comp-ph
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极性向列相溶剂化理论

Theory of solvation in polar nematics

Vitaly Kapko, Dmitry V. Matyushov

摘要:

本文建立了离子和偶极溶质在各向异性轴对称极性溶剂中溶剂化的线性响应理论。该理论被应用于极性双极性液晶的溶剂化。正式的理论构造的溶剂化响应函数的溶剂偶极磁化率的旋转不变量的投影。这些预测是从蒙特卡罗模拟的偶极spherocylinders的流体,可以存在于各向同性和双相。基于模拟得到的溶剂敏感性的性质和形式解,我们得到了一个溶剂化自由能的公式,该公式结合了向列相的实验性质和液晶中偶极间的相关长度。本文计算了香豆素-153在4-正戊基-4 '-氰基联苯(5CB)和4,4-正庚基-氰基联苯(7 CB)溶剂中的Stokes位移和Stokes位移关联函数,并与温度作了比较。

英文摘要:

We develop a linear response theory of solvation of ionic and dipolar solutes in anisotropic, axially symmetric polar solvents. The theory is applied to solvation in polar nematic liquid crystals. The formal theory constructs the solvation response function from projections of the solvent dipolar susceptibility on rotational invariants. These projections are obtained from Monte Carlo simulations of a fluid of dipolar spherocylinders which can exist both in the isotropic and nematic phase. Based on the properties of the solvent susceptibility from simulations and the formal solution, we have obtained a formula for the solvation free energy which incorporates experimentally available properties of nematics and the length of correlation between the dipoles in the liquid crystal. Illustrative calculations are presented for the Stokes shift and Stokes shift correlation function of coumarin-153 in 4-n-pentyl-4'-cyanobiphenyl (5CB) and 4,4-n-heptyl-cyanopiphenyl (7CB) solvents as a function of temperature in both the nematic and isotropic phase.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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