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Characterization of fluids via measurement of the rotational dynamics of suspended magnetic microdiscs (2015)

Nicolas Garraud and David P. Arnold

American Institute of Physics (AIP)

In: Journal of Applied Physics

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Publication Date: 2015-04-23

Description: This paper proposes, analyzes, and demonstrates a method to characterize fluids by monitoring the rotational dynamics of 2.5- μ m-diameter magnetic microdiscs in suspension via optical interrogation. The free-floating discs function like synchronized micro-shutters when actuated by an external magnetic field. Their motion is monitored via light transmission in response to a rotating magnetic field. The disc rotation is found, both theoretically and experimentally, to depend on the amplitude and the rotation frequency of the applied magnetic field with a high sensitivity to fluid viscosity changes from 1 to 2 mPa s, independent of the disc concentration in the solution from 20 to 120 M/ml. Consequently, the discs can function as microsensors via simple optical measurements.

Print ISSN: 0021-8979

Electronic ISSN: 1089-7550

Topics: Physics

Published by American Institute of Physics (AIP)

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