Charged silica suspensions as model materials for liquids in confined geometries
Charged silica suspensions as model materials for liquids in confined geometries
复制标题
带电二氧化硅悬浮液作为受限几何形状液体的模型材料
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
R. Klitzing
中科院分区：
文献类型：
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作者：
S. Klapp;S. Grandner;Yan Zeng;R. Klitzing
结合计算机模拟和实验，我们研究了颗粒电荷对受限二氧化硅胶体(狭缝-孔几何)分层行为的影响。为此，我们用胶体探针原子力显微镜测量了三种不同颗粒大小的受限悬浮液的振荡溶剂化力(以及由此产生的总电荷)。对于所有的体系，振动波长与体积分数的函数关系都表现出相似指数的幂函数行为。然而，不同颗粒大小的结果不能简单地相互映射，这表明了由于不同的库仑耦合而产生的关联效应的重要性。我们的实验结果与(DLVO)模型系统的并行蒙特卡罗计算机模拟的结果是一致的。
Combining computer simulations and experiments we investigate the role of particle charges on the layering behavior of confined silica colloids (slit-pore geometry). To this end we perform colloidal-probe atomic-force-microscope measurements of the oscillatory solvation force of confined suspensions involving three different particle sizes (and resulting total charges). For all systems, the wavelength of the oscillations as function of volume fraction is found to display a power-law behavior characterized by similar exponents. However, the results for different particle sizes cannot be simply mapped onto each other, which demonstrates the importance of correlation effects due to the different Coulomb coupling. Our experimental findings are consistent with the results from parallel Monte Carlo computer simulations of a (DLVO) model system.