title: Brownian motion of boomerang colloidal particles.
abstract: 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 the superposition of two diffusive modes: the ellipsoidal motion of the CoH and the rotational motion of the tracking point with respect to the CoH.
authors.affiliation: Liquid Crystal Institute, Kent State University, Kent, Ohio 44242, USA.
authors.forename: Ayan
authors.initials: A
authors.lastname: Chakrabarty
authors.forename: Andrew
authors.initials: A
authors.lastname: Konya
authors.forename: Feng
authors.initials: F
authors.lastname: Wang
authors.forename: Jonathan V
authors.initials: JV
authors.lastname: Selinger
authors.forename: Kai
authors.initials: K
authors.lastname: Sun
authors.forename: Qi-Huo
authors.initials: QH
authors.lastname: Wei