Asymptotic structure of charged colloids between two and three dimensions: the influence of salt
Asymptotic structure of charged colloids between two and three dimensions: the influence of salt
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二维和三维带电胶体的渐近结构：盐的影响
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
R. von Klitzing
中科院分区：
文献类型：
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作者：
S. Klapp;S. Grandner;Yan Zeng;R. von Klitzing
我们目前的理论，计算机模拟和实验结果的结构长度尺度表征散装和受限的带电胶体悬浮液。目标量一方面是体对相关函数，另一方面是各种厚度的膜中的胶体的振荡溶剂化力。最近，我们已经表明，对于一个系统具有非常低的盐浓度，这些数量的特点是相同的波长在渐近极限，与密度泛函理论的预测。在这里，我们考虑添加盐的离子强度较大的系统。我们的研究结果表明，波长基本上保持不受影响，而相关长度和振幅显着依赖于添加的盐的量。事实上，在离子盐强度低至10−3 mol l−1时，力的振荡基本消失。
We present theoretical, computer simulation and experimental results for the structural length scales characterizing bulk and confined charged colloidal suspensions. The target quantities are the bulk pair correlation functions on the one hand, and the oscillatory solvation forces of the colloids in films of various thicknesses on the other. Recently we have shown, for a system with very low salt concentration, that these quantities are characterized by the same wavelength in the asymptotic limit, in agreement with predictions from density functional theory. Here we consider systems with larger ionic strengths of added salt. Our results indicate that the wavelength remains essentially unaffected, whereas the correlation length and the amplitude depend significantly on the amount of added salt. Indeed, already at ionic salt strengths as low as 10−3 mol l−1 the force oscillations essentially disappear.