Even hard-sphere colloidal suspensions display Fickian yet non-Gaussian diffusion
- Univ. of Illinois, Urbana, IL (United States); University of Illinois
- Univ. of Illinois, Urbana, IL (United States)
In this study, we scrutinize three decades of probability density displacement distribution in a simple colloidal suspension with hard-sphere interactions. In this index-matched and density-matched solvent, fluorescent tracer nanoparticles diffuse among matrix particles that are eight times larger, at concentrations from dilute to concentrated, over times up to when the tracer diffuses a few times its size. Displacement distributions of tracers, Gaussian in pure solvent, broaden systematically with increasing obstacle density. The onset of non-Gaussian dynamics is seen in even modestly dilute suspensions, which traditionally would be assumed to follow classic Gaussian expectation. The findings underscore, in agreement with recent studies of more esoteric soft matter systems, the prevalence of non-Gaussian yet Fickian diffusion.
- Research Organization:
- Univ. of Illinois, Urbana, IL (United States)
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- FG02-02ER46019
- OSTI ID:
- 1252185
- Journal Information:
- ACS Nano, Journal Name: ACS Nano Journal Issue: 4 Vol. 8; ISSN 1936-0851
- Publisher:
- American Chemical Society (ACS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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