Reduction of Viscosity in Suspension of Swimming Bacteria

被引：283

作者：

Sokolov, Andrey ^{[1
,2
]}

Aranson, Igor S. ^{[2
]}

机构：

[1] IIT, Chicago, IL 60616 USA

[2] Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA

来源：

PHYSICAL REVIEW LETTERS | 2009年 / 103卷 / 14期

关键词：

D O I：

10.1103/PhysRevLett.103.148101

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Measurements of the shear viscosity in suspensions of swimming Bacillus subtilis in free-standing liquid films have revealed that the viscosity can decrease by up to a factor of 7 compared to the viscosity of the same liquid without bacteria or with nonmotile bacteria. The reduction in viscosity is observed in two complementary experiments: one studying the decay of a large vortex induced by a moving probe and another measuring the viscous torque on a rotating magnetic particle immersed in the film. The viscosity depends on the concentration and swimming speed of the bacteria.

引用

页数：4

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