Electrodiffusiophoresis: Particle motion in electrolytes under direct current
Electrodiffusiophoresis: Particle motion in electrolytes under direct current
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DOI：
10.1063/1.3496976
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发表时间：
2010-11-01
影响因子：
4.6
通讯作者：
Bazant, Martin Z.
中科院分区：
文献类型：
--
作者：
Rica, Raul A.;Bazant, Martin Z.
电解质中的胶体颗粒响应于电场（电泳）和盐浓度梯度（扩散电泳）而移动，并且相关的流动也在固定表面上发生（分别为电渗透和扩散渗透）。单独来看，这些电动现象很好理解，例如，没有远场浓度梯度的电泳和没有施加电场的扩散电泳。然而，当电解质通过直流电时，浓度梯度伴随着体电场（浓度极化）由此产生的粒子运动称为“电扩散电泳”，涉及电泳和扩散电泳的非线性组合，具体取决于离子迁移数和粒子特性。在这项工作中，我们在薄双层的限制下分析了球形粒子的电扩散电泳，忽略了表面传导（Du
Colloidal particles in electrolytes move in response to electric fields (electrophoresis) and salt concentration gradients (diffusiophoresis), and related flows also occur at fixed surfaces (electro-osmosis and diffusio-osmosis, respectively) In isolation, these electrokinetic phenomena are well understood, e g, electrophoresis without far-field concentration gradients and diffusiophoresis without applied electric fields When the electrolyte passes direct current, however, concentration gradients accompany the bulk electric field (concentration polarization) and the resulting particle motion, called "electrodiffusiophoresis," involves a nonlinear combination of electrophoresis and diffusiophoresis, depending on ion transference numbers and particle properties In this work, we analyze the electrodiffusiophoresis of spherical particles in the limit of thin double layers, neglecting surface conduction (Du