Detection of Brownian Torque in a Magnetically-Driven Rotating Microsystem

Scientific Reports
Maria N RomodinaAndrey A Fedyanin

Abstract

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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Citations

Mar 4, 2020·Langmuir : the ACS Journal of Surfaces and Colloids·Wen-Zhen FangWen-Quan Tao

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Methods Mentioned

BETA
microsensor
biosensor
optical tweezers

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