论文标题
释放离子的janus颗粒的自扩张
Self-diffusiophoresis of Janus particles that release ions
论文作者
论文摘要
催化的Janus游泳者通过自我生成浓度和电势的梯度来表现出弥漫性运动。最近的工作集中在简化的病例上，例如仅释放一种类型的离子或离子的低表面通量，并具有有限的理论指导。在这里，我们考虑释放两种类型离子的颗粒的实验相关情况，并在薄静电弥漫层的极限下获得粒子速度的简单表达式。即使离子通量和表面电势很大，我们的近似表达也非常准确，并且可以解释许多有趣的现象，例如响应盐浓度的变化或未充电颗粒的自我散发性的粒子运动方向的反向。
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.
