A combined rheometry and imaging study of viscosity reduction in bacterial suspensions

被引：43

作者：

Martinez, Vincent A. ^{[1
,2
]}

Clement, Eric ^{[3
]}

Arlt, Jochen ^{[1
,2
]}

Douarche, Carine ^{[4
]}

Dawson, Angela ^{[1
,2
]}

Schwarz-Linek, Jana ^{[1
,2
]}

Creppy, Adama K. ^{[4
]}

Skultety, Viktor ^{[1
,2
]}

Morozov, Alexander N. ^{[1
,2
]}

Auradou, Harold ^{[4
]}

Poon, Wilson C. K. ^{[1
,2
]}

机构：

[1] Univ Edinburgh, SUPA, Edinburgh EH9 3FD, Midlothian, Scotland

[2] Univ Edinburgh, Sch Phys & Astron, Edinburgh EH9 3FD, Midlothian, Scotland

[3] Univ Paris, Sorbonne Univ, Univ PSL, CNRS,ESPCI Paris,Phys & Mecan Milieux Heterogenes, F-75005 Paris, France

[4] Univ Paris Saclay, CNRS, FAST, F-91405 Orsay, France

来源：

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA | 2020年 / 117卷 / 05期

基金：

欧洲研究理事会; 英国生物技术与生命科学研究理事会; 欧盟第七框架计划;

关键词：

Escherichia coli; rheology and imaging; particle tracking; particle image; velocimetry; active matter; RHEOLOGY; MODEL;

D O I：

10.1073/pnas.1912690117

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Suspending self-propelled "pushers" in a liquid lowers its viscosity. We study how this phenomenon depends on system size in bacterial suspensions using bulk rheometry and particle-tracking rheoimaging. Above the critical bacterial volume fraction needed to decrease the viscosity to zero, phi(c) approximate to 0.75%, large-scale collective motion emerges in the quiescent state, and the flow becomes nonlinear. We confirm a theoretical prediction that such instability should be suppressed by confinement. Our results also show that a recent application of active liquid-crystal theory to such systems is untenable.

引用

页码：2326 / 2331

页数：6

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