Detection of Brownian Torque in a Magnetically-Driven Rotating Microsystem

Thermal fluctuations significantly affect the behavior of microscale systems rotating in shear flow, such as microvortexes, microbubbles, rotating micromotors, microactuators and other elements of lab-on-a-chip devices. The influence of Brownian torque on the motion of individual magnetic microparti...

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Bibliographic Details
Published inScientific reports Vol. 6; no. 1; p. 21212
Main Authors Romodina, Maria N., Lyubin, Evgeny V., Fedyanin, Andrey A.
Format Journal Article
LanguageEnglish
Published London Nature Publishing Group UK 15.02.2016
Nature Publishing Group
Subjects
639/624/1107/1110
639/766/119/997
Brownian motion
Humanities and Social Sciences
Lab-on-a-chip
Magnetic fields
Magnetism
Microparticles
multidisciplinary
Science
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Summary:Thermal fluctuations significantly affect the behavior of microscale systems rotating in shear flow, such as microvortexes, microbubbles, rotating micromotors, microactuators and other elements of lab-on-a-chip devices. The influence of Brownian torque on the motion of individual magnetic microparticles in a rotating magnetic field is experimentally determined using optical tweezers. Rotational Brownian motion induces the flattening of the breakdown transition between the synchronous and asynchronous modes of microparticle rotation. The experimental findings regarding microparticle rotation in the presence of Brownian torque are compared with the results of numerical Brownian dynamics simulations.
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ISSN:2045-2322
2045-2322
DOI:10.1038/srep21212