Fachbereich Physik, Universität Konstanz, Konstanz, Germany.
School of Physics and Telecommunication Engineering, South China Normal University, Guangzhou, China.
Eur Phys J E Soft Matter. 2021 Mar 11;44(3):28. doi: 10.1140/epje/s10189-021-00033-w.
We study the behavior of active particles (APs) moving in a viscoelastic fluid in the presence of geometrical confinements. Upon approaching a flat wall, we find that APs slow down due to compression of the enclosed viscoelastic fluid. In addition, they receive a viscoelastic torque leading to sudden orientational changes and departure from walls. Based on these observations, we develop a numerical model which can also be applied to other geometries and yields good agreement with experimental data. Our results demonstrate, that APs are able to move through complex geometrical structures more effectively when suspended in a viscoelastic compared to a Newtonian fluid.
我们研究了在几何约束存在的情况下，粘性流体中运动的活性粒子（APs）的行为。当接近一个平面壁时，我们发现由于封闭的粘性流体的压缩，APs 的速度会减慢。此外，它们还会受到粘性扭矩的作用，从而导致突然的方向变化和离开壁面。基于这些观察，我们开发了一个数值模型，该模型也可以应用于其他几何形状，并与实验数据吻合良好。我们的结果表明，与牛顿流体相比，当悬浮在粘性流体中时，APs 能够更有效地穿过复杂的几何结构。
