离子介导的网络中性板之间的相互作用：弱和强无序效应
Ion-mediated interactions between net-neutral slabs: Weak and strong disorder effects
摘要：
我们研究了两个随机带电，但否则净中性，平面介质板浸没在一个不对称的库仑流体含有移动的单价和多价离子的混合物之间的有效相互作用。与范德华力和图像诱导的离子耗尽相互作用提供的标准图片相比，平板的并列边界表面上的电荷无序的存在导致它们相互作用的方式发生实质性的变化。虽然，后者预测纯粹的吸引力严格中性板之间的相互作用，我们表明，从表面电荷紊乱，图像耗尽，德拜（或盐）屏蔽，也特别是，他们的耦合与多价离子的组合效应，引起一个更多样化的行为净中性板之间的有效相互作用。无序效应表现出很大的变化，这取决于适当量化的无序强度，当表面电荷是弱无序时，导致与排斥和吸引分支的非单调有效相互作用（小的无序方差）或主导吸引相互作用，其在范围和幅度上都大于从范德华力和图像诱导的离子耗尽相互作用预测的，当表面是强烈无序的（大的无序变化）时。
英文摘要：
We investigate the effective interaction between two randomly charged but otherwise net-neutral, planar dielectric slabs immersed in an asymmetric Coulomb fluid containing a mixture of mobile monovalent and multivalent ions. The presence of charge disorder on the apposed bounding surfaces of the slabs leads to substantial qualitative changes in the way they interact, as compared with the standard picture provided by the van der Waals and image-induced, ion-depletion interactions. While, the latter predict purely attractive interactions between strictly neutral slabs, we show that the combined effects from surface charge disorder, image depletion, Debye (or salt) screening and also, in particular, their coupling with multivalent ions, give rise to a more diverse behavior for the effective interaction between net-neutral slabs. Disorder effects show large variation depending on the properly quantified strength of disorder, leading either to non-monotonic effective interaction with both repulsive and attractive branches when the surface charges are weakly disordered (small disorder variance) or to a dominating attractive interaction that is larger both in its range and magnitude than what is predicted from the van der Waals and image-induced, ion-depletion interactions, when the surfaces are strongly disordered (large disorder variance).
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