2020/12/31 by Beybin Ilhan, Frieder Mugele, Michael H. G. Duits · 1 citation
Physics and Astronomy · #cond-mat.soft
paper · pdf · doi:10.1016/j.jcis.2021.08.212
published as JCIS, Volume 607, Part 2, February 2022, Pages 1709-1716
arxiv created 2021/09/27 · arxiv updated 2021/09/29
Roughening the surface of spherical colloids can drastically change their translational and rotational dynamics in dense suspensions. Using 3D confocal microscopy, we show that roughness not only lowers the concentration of the translational colloidal glass transition, but also generates a broad concentration range in which the rotational Brownian motion changes signature from high-amplitude diffusive to low-amplitude rattling. This hitherto not reported second glass transition for rough spherical colloids emerges when the particle intersurface distance becomes comparable to the roughness length scale. Interlocking contacts are responsible for restricting the particle rotations.