Slipping friction of an optically and magnetically manipulated microsphere rolling at a glass-water interface

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dc.creatorAgayan, Rodney R.
dc.creatorSmith, Ron G.
dc.creatorKopelman, Raoul
dc.date2008-03-03
dc.date.accessioned2026-07-07T10:02:25Z
dc.date.available2026-07-07T10:02:25Z
dc.descriptionThe motion of submerged magnetic microspheres rolling at a glass-water interface has been studied using magnetic rotation and optical tweezers combined with bright-field microscopy particle tracking techniques. Individual microspheres of varying surface roughness were magnetically rotated both in and out of an optical trap to induce rolling, along either plain glass cover slides or glass cover slides functionalized with polyethylene glycol. It has been observed that the manipulated microspheres exhibited nonlinear dynamic rolling-while-slipping motion characterized by two motional regimes: At low rotational frequencies, the speed of microspheres free-rolling along the surface increased proportionately with magnetic rotation rate; however, a further increase in the rotation frequency beyond a certain threshold revealed a sharp transition to a motion in which the microspheres slipped with respect to the external magnetic field resulting in decreased rolling speeds. The effects of surface-microsphere interactions on the position of this threshold frequency are posed and investigated. Similar experiments with microspheres rolling while slipping in an optical trap showed congruent results.
dc.descriptionsubmitted to Journal of Applied Physics, 11 figures
dc.identifierhttps://arxiv.org/abs/0803.0328
dc.identifierhttp://arxiv.org/abs/0803.0328
dc.identifierJ. Appl. Phys. 104 (2008) 054915
dc.identifierdoi:10.1063/1.2976355
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/168971
dc.subjectOptics
dc.subjectBiological Physics
dc.subjectFluid Dynamics
dc.titleSlipping friction of an optically and magnetically manipulated microsphere rolling at a glass-water interface
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