Diffusion of single ellipsoids under quasi-2D confinements

2009/03/07 by Yilong Han, Han, Y., Ahmed AlSayed +5
Computer Science · Mathematics · #Advanced Mathematical Modeling in Engineering #FOS: Physical sciences #Point processes and geometric inequalities #Soft Condensed Matter (cond-mat.soft)

paper · pdf · doi:10.48550/arxiv.0903.1332

openalex publication_date 2009/03/07 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We report video-microscopy measurements of the translational and rotational Brownian motions of isolated ellipsoidal particles in quasi-two-dimensional sample cells of increasing thickness. The long-time diffusion coefficients were measured along the long (D_a) and short (D_b) ellipsoid axes, respectively, and the ratio, D_a/D_b, was determined as a function of wall confinement and particle aspect ratio. In three-dimensions this ratio (D_a/D_b) cannot be larger than two, but wall confinement was found to substantially alter diffusion anisotropy and substantially slow particle diffusion along the short axis.

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