偶极Janus粒子的相态结构调控及应用

doi:10.7503/cjcu20190709

摘要/Abstract

摘要：

基于热力学微扰理论研究了偶极Janus粒子的聚集态结构及相态特征, 考察了粒子间的缔合作用、偶极作用及外电场对体系相态结构的调控机制. 结果表明, 在偶极Janus粒子的聚集过程中, 粒子间的链型结构与支化结构之间存在竞争, 致使其平衡相行为显著有别于常规流体的相行为. 作为应用, 计算了偶极Janus粒子体系的介电常数, 得到其类气相及类液相的介电常数与缔合作用、偶极作用及外电场的依赖关系.

关键词: 偶极Janus粒子, 相平衡, 聚集态结构, 介电常数

Abstract:

The aggregation and phase states of dipolar Janus particles were presented based on the thermodynamic perturbation theory. An attempt was made to find how the association, dipole-dipole interaction and external electric field regulate the cluster structures and properties of the system. It was shown that there existed a competition between chainlike and branched structures in a cluster, which resulted in an entirely different phase behavior from the common fluids. As an application, the dielectric constants for the gas-like and liquid-like phases were carried out, which demonstrated a significant dependence on the association, dipole-dipole interaction and external electric field. Interestingly, the reproducibility of dielectric constant with changeable temperature for the liquid-like phase was found, which could be useful for designing the relevant materials.

Key words: Dipolar Janus particle, Phase equilibria, Aggregation state, Dielectric constant

中图分类号:

O642
O631

TrendMD:

李红红,耿科颖,田芙月,顾芳,王海军. 偶极Janus粒子的相态结构调控及应用. 高等学校化学学报, 2020, 41(5): 1042.

LI Honghong,GENG Keying,TIAN Fuyue,GU Fang,WANG Haijun. Regulation of Phase State of Dipolar Janus Particles and Its Application ^†. Chem. J. Chinese Universities, 2020, 41(5): 1042.

图/表 5

Fig.1 Phase diagram of association Janus particles under different junction energies

Fig.2 Phase diagram of dipolar Janus particles under different dipole-dipole interactions

Fig.3 Phase diagram of dipolar Janus particles under different electric field intensities

Fig.4 ε-? plots of dipolar Janus particles under different electric field intensities

Fig.5 Plots of ε against T* of dipolar Janus particles under different electric field intensities

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