Name of Research Group:Soft Matter Physics Lab (SMPL)

Description of Research Group:Our research interests are the classical topics in the soft matter physics, including the wetting phenomena, the passive and active Brownian motion in confined space and the self-assembly away from equilibrium state.

Colloidal particles in the Hele-Shaw cell exhibit distinct dynamics due to the confinement. The interaction among the particles make the problem much complicated. The microscopic collision process between particles and the thinning fluid layer surrounded is intriguing in the confined 2D system. By using the thermal controlling, magnetic (electric) filed we play the games on the Brownian motion of the passive particles and active stochastic microswimmers.

Recently, we are employing the bacteria, E. Coli, to illustrate the hydrodynamic behavior in the microfluidic channels, and the run-tumble active random motion. We quantitatively measure the bacteria orientation responding to the surrounding fluid flow, especially when the mean velocity of the fluid is comparable with the swimming velocity of the bacteria. We are extremely attracted to the collective motion, active rheology of the bacteria in the limited slow Poisseuille flow in the microfluidic channels.

Meanwile, drying suspension on diverse substrates with varying conditions is another topic we are still working on. Wetting control by nanostructured semiconductor materials is dedicated to the drying pattern from the colloidal suspension. Pressure (high pressure/vacuum) and temperature (heating and frozen) are used to control the drying dynamics of drops with the complex fluid.

Team members Introduction:

课题：自驱动杆模型下研究领导者在集群运动中的作用

同一个群落，系统的多样性对系统整体的效益将产生何种影响？本人的工作从自驱动杆模型（SPR）除非，研究一个具有大量自驱动粒子组成的相互作用系统，考察粒子长度与活性（速度）多样化，回答是否存在普适相图来定格系统整体效益（平均速度、能量密度）。从物理角度回答如何从单一群体中个体的biodieversity使系统获益，以及设定何种“协作规则”即相互作用势，让系统效益最大化。