论文标题
基于扩散的高度分析揭示了鲁棒的微壁壁分离
Diffusion-based height analysis reveals robust microswimmer-wall separation
论文作者
论文摘要
Microswimmers通常在墙壁附近移动，这可以强烈影响其运动。但是，游泳者壁分离的直接实验测量仍然难以捉摸。在这里，我们确定了模型催化微晶状体的这种分离，从其均值位移的被动分量的高度依赖性。我们发现游泳者表现出“ Ypsotaxis”，这是一种在墙壁上方固定高度的趋势，即一系列盐浓度，游泳者的表面电荷和游泳器尺寸。我们的发现表明，Ypsotaxis是活动引起的，对他们仍在争论的推进机制的未来建模构成了限制。
Microswimmers typically move near walls, which can strongly influence their motion. However, direct experimental measurements of swimmer-wall separation remain elusive to date. Here, we determine this separation for model catalytic microswimmers from the height dependence of the passive component of their mean-squared displacement. We find that swimmers exhibit "ypsotaxis", a tendency to assume a fixed height above the wall for a range of salt concentrations, swimmer surface charges, and swimmer sizes. Our findings indicate that ypsotaxis is activity-induced, posing restrictions on future modeling of their still debated propulsion mechanism.
