Tunable Memory and Activity of Quincke Particles in Micellar Fluid  

作　　者：杨洋 张梦菲 朱来来 张天辉 Yang Yang;Meng Fei Zhang;Lailai Zhu;and Tian Hui Zhang(Center for Soft Condensed Matter Physics and Interdisciplinary Research&School of Physical Science and Technology,Soochow University,Suzhou 215006,China;Department of Mechanical Engineering,National University of Singapore,117575,Singapore)

机构地区：[1]Center for Soft Condensed Matter Physics and Interdisciplinary Research&School of Physical Science and Technology,Soochow University,Suzhou 215006,China [2]Department of Mechanical Engineering,National University of Singapore,117575,Singapore

出　　处：《Chinese Physics Letters》2023年第12期98-103,共6页中国物理快报（英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant No. 11974255);Singapore Ministry of Education Academic Research Fund Tier 2 (Grant Nos. MOET2EP50221-0012 and MOE-T2EP50122-0015)。

摘　　要：Memory can remarkably modify the collective behavior of active particles. We show that, in a micellar fluid, Quincke particles driven by a square-wave electric field exhibit a frequency-dependent memory. Upon increasing the frequency, a memory of directions emerges, whereas the activity of particles decreases. As the activity is dominated by interaction, Quincke particles aggregate and form dense clusters, in which the memory of the direction is further enhanced due to the stronger electric interactions. The density-dependent memory and activity result in dynamic heterogeneity in flocking and offer a new opportunity for research of collective motions.

关 键 词：PARTICLES COLLECTIVE DIRECTIONS 

分 类 号：O469[理学—凝聚态物理]