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J Phys Chem B. 2006 Sep 28;110(38):18958-64.

Sudden breakdown in linear response of a rotationally driven magnetic microparticle and application to physical and chemical microsensing.

Author information

1
Applied Physics Program, 2477 Randall Laboratory, The University of Michigan, Ann Arbor, Michigan 48109-1120, USA.

Abstract

In this work, sensing magnetic microparticles were used to probe both the local pH and the viscosity-dependent nonlinear rotational behavior of the particles. The latter resulted from a critical transition marking a driven particle's crossover from phase-locking to phase-slipping with an externally rotating magnetic field, i.e., a sudden breakdown in its linear response that can be used to measure a variety of physical quantities. The transition from simple rotation to wobbling is described both theoretically and experimentally. The ability to measure both chemical and physical properties of a system could enable simultaneous monitoring of chemical and physical interactions in biological or other complex fluid microsystems.

PMID:
16986890
DOI:
10.1021/jp060139h

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