Brownian Motion of Boomerang Colloidal Particles
Ayan Chakrabarty, Andrew Konya, Feng Wang, Jonathan V. Selinger, Kai, Sun, Qi-Huo Wei
TL;DR
This study explores the Brownian motion of boomerang-shaped colloidal particles, revealing how their diffusion behavior is influenced by hydrodynamic stress and rotational dynamics, supported by experimental data and Langevin theory modeling.
Contribution
It introduces a model combining translational and rotational diffusion modes to explain the complex motion of boomerang colloids, highlighting the influence of tracking points.
Findings
Mean displacements biased towards the hydrodynamic stress center
Crossover from fast to slow diffusion over time
Diffusion coefficients depend on tracking point location
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 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.
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