溶剂化对表面带负电胶体间长程吸引的选择性介导
Mediation of Long-Range Attraction Selectively between Negatively-Charged Colloids on Surfaces by Solvation
摘要：
我们提出了一个平均场分析模型来解释所观察到的不对称性的能力，形成远程吸引力的带负电荷的胶体粒子，而不是他们的等价带电的正对应物。我们推测，这种不对称性是由于溶剂化效应，我们现象学捕捉它的物理考虑这种水引起的短程排斥不同的电荷物种之间的相对强度。然后，我们将我们的模型的胶体系统的带负电荷的磁盘被中和的抗衡离子的海洋和强烈吸收的界面在一个可压缩的二元系统。我们证明了作为密度和相互作用强度的函数的稀释的各向同性离子相和凝聚的六方晶格相之间的共存。
英文摘要：
We propose a mean-field analytical model to account for the observed asymmetry in the ability to form long-range attraction by the negatively charged colloidal particles and not their equivalently charged positive counterpart. We conjecture that this asymmetry is due to solvation effects, and we phenomenologically capture its physics by considering the relative strength of this water-induced short-range repulsion between the different charge species. We then apply our model to the colloidal system of negatively charged disks that are neutralized by a sea of counterions and strongly absorbed to an interface in a compressible binary system. We demonstrate the resulting coexistence between a dilute isotropic ionic phase and a condensed hexagonal lattice phase as a function of density and interaction strength.
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