Velocity Fluctuations in Sedimenting Brownian Particles

We report a gradual transition of dynamics in sedimenting suspensions of charge stabilized Brownian particles prior to the onset of the macroscopic sedimentation front. Using multispeckle ultrasmall-angle x-ray photon correlation spectroscopy (USA-XPCS), we show that well-defined advective motions d...

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Bibliographic Details
Published in:Physical review letters 2017-05, Vol.118 (19), p.198001-198001, Article 198001
Main Authors: Möller, Johannes, Narayanan, Theyencheri
Format: Article
Language:English
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Summary:We report a gradual transition of dynamics in sedimenting suspensions of charge stabilized Brownian particles prior to the onset of the macroscopic sedimentation front. Using multispeckle ultrasmall-angle x-ray photon correlation spectroscopy (USA-XPCS), we show that well-defined advective motions dominate the colloid dynamics during the early stages of sedimentation. With elapsing time, these advective currents decay and diffusive motions become the dominating contribution in the dynamics. Probing the temporal development of these fluctuations at smaller Peclet numbers (
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.118.198001