论文标题
带电和未充电的二进制混合物中的结构相关性和相位分离
Structural correlations and phase separation in binary mixtures of charged and uncharged colloids
论文作者
论文摘要
使用具有显式微观的原始模型的计算机模拟计算了带电球和未充电球的二元混合物中胶体之间的结构相关性。对于大型介电常数的溶剂中的水悬浮液，传统的derjaguin-landau-vervey-overbeek（DLVO）线性筛选理论补充了硬核相互作用，它重现了完全原始模型中获得的结构相关性。然而，对于较低的介电对比，微观和宏观之间的库仑耦合增加会导致较强的偏差。我们发现流体流体相分离为两个带有带电或无带电颗粒的区域，而DLVO理论不会再现。我们的结果在胶体或纳米颗粒的带电混合物上的散射或真实空间实验中进行了验证。
Structural correlations between colloids in a binary mixture of charged and uncharged spheres are calculated using computer simulations of the primitive model with explicit microions. For aqueous suspensions in a solvent of large dielectric constant, the traditional Derjaguin-Landau-Vervey-Overbeek (DLVO) theory of linear screening, supplemented with hard core interactions, reproduces the structural correlations obtained in the full primitive model quantitatively. However for lower dielectric contrast, the increasing Coulomb coupling between the micro- and macroions results in strong deviations. We find a fluid-fluid phase separation into two regions either rich in charged or rich in uncharged particles which is not reproduced by DLVO theory. Our results are verifiable in scattering or real-space experiments on charged-uncharged mixtures of colloids or nanoparticles.
