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arXiv 2201.07776cond-mat.softphysics.flu-dyn
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释放离子的Janus粒子的自扩散电泳

Self-diffusiophoresis of Janus particles that release ions

Evgeny S. Asmolov, Tatiana V. Nizkaya, Olga I. Vinogradova

摘要:

催化Janus泳者通过自发产生浓度梯度和电势来展示扩散泳运动。最近的工作集中在简化的情况下,如释放的离子或离子的低表面通量,与有限的理论指导。在这里,我们考虑实验相关的情况下,释放两种类型的离子的粒子,并获得一个简单的表达式的粒子速度在薄的静电扩散层的限制。我们的近似表达式是非常准确的,即使当离子通量和表面电位是大的,并允许一个解释一些有趣的现象,如在粒子运动的方向上的反向响应于盐浓度的变化或自扩散电泳的不带电粒子。

英文摘要:

Catalytic Janus swimmers demonstrate a diffusio-phoretic motion by self-generating the gradients of concentrations and electric potential. Recent work has focused on simplified cases, such as a release of solely one type of ions or low surface fluxes of ions, with limited theoretical guidance. Here, we consider the experimentally relevant case of particles that release both types of ions, and obtain a simple expression for a particle velocity in the limit of thin electrostatic diffuse layer. Our approximate expression is very accurate even when ion fluxes and surface potentials are large, and allows one to interpret a number of intriguing phenomena, such as the reverse in the direction of the particle motion in response to variations of the salt concentration or self-diffusiophoresis of uncharged particles.

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