Brownian Motion of Boomerang Colloidal Particles

We investigate the Brownian motion of boomerang colloidal particles confined between two glass plates. Our experimental observations show that the mean displacements are biased towards the center of hydrodynamic stress (CoH), and that the mean-square displacements exhibit a crossover from short time...

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Bibliographic Details
Published inarXiv.org
Main Authors Chakrabarty, Ayan, Konya, Andrew, Wang, Feng, Selinger, Jonathan V, Sun, Kai, Qi-Huo, Wei
Format Paper Journal Article
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 19.08.2013
Subjects
Brownian motion
Crossovers
Diffusion rate
Glass plates
Physics - Soft Condensed Matter
Superposition (mathematics)
Time dependence
Tracking
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Summary:We investigate the Brownian motion of boomerang colloidal particles confined between two glass plates. Our experimental observations show that the mean displacements are biased towards the center of hydrodynamic stress (CoH), and that the mean-square displacements exhibit a crossover from short time faster to long time slower diffusion with the short-time diffusion coefficients dependent on the points used for tracking. A model based on Langevin theory elucidates that these behaviors are ascribed to a superposition of two diffusive modes: the ellipsoidal motion of the CoH and the rotational motion of the tracking point with respect to the CoH.
ISSN:2331-8422
DOI:10.48550/arxiv.1308.3656