Controlling wall-particle interactions with activity

被引:1
|
作者
Neville, Luke [1 ,2 ]
Eggers, Jens [1 ]
Liverpool, Tanniemola B. [1 ,2 ]
机构
[1] Univ Bristol, Sch Math, Fry Bldg, Bristol BS8 1UG, England
[2] Isaac Newton Inst Math Sci, Cambridge CB3 0EH, England
基金
英国工程与自然科学研究理事会;
关键词
SLOW MOTION; COLLOIDAL INTERACTIONS; VISCOUS-FLUID; HYDRODYNAMICS; LIQUID; SPHERE;
D O I
10.1039/d4sm00634h
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
We theoretically determine the effective forces on hard disks near walls embedded inside active nematic liquid crystals. When the disks are sufficiently close to the wall and the flows are sufficiently slow, we can obtain exact expressions for the effective forces. We find these forces and the dynamics of disks near the wall depend both on the properties of the active nematic and on the anchoring conditions on the disks and the wall. Our results show that the presence of active stresses attract planar anchored disks to walls if the activity is extensile, and repel them if contractile. For normal anchored disks the reverse is true; they are attracted in contractile systems, and repelled in extensile ones. By choosing the activity and anchoring, these effects may be helpful in controlling the self assembly of active nematic colloids. The interaction between a disk and wall in an active nematic depends on a combination of activity and anchoring, with contractile nematics repelling disks with planar anchoring.
引用
收藏
页码:8395 / 8406
页数:12
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