偶极Janus粒子的相态结构调控及应用

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.

Regulation of Phase State of Dipolar Janus Particles and Its Application †

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.