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

, : Sudden breakdown in linear response of a rotationally driven magnetic microparticle and application to physical and chemical microsensing. Journal of Physical Chemistry. B 110(38): 18958-18964

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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