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Even hard-sphere colloidal suspensions display Fickian yet non-Gaussian diffusion

Journal Article · · ACS Nano
DOI:https://doi.org/10.1021/nn405476t· OSTI ID:1252185
 [1];  [2];  [2]
  1. Univ. of Illinois, Urbana, IL (United States); University of Illinois
  2. 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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Anomalous diffusion models and their properties: non-stationarity, non-ergodicity, and ageing at the centenary of single particle tracking journal January 2014
Anomalous diffusion in time-fluctuating non-stationary diffusivity landscapes journal January 2016
Tracer diffusion in a sea of polymers with binding zones: mobile vs. frozen traps journal January 2016
Connectivity, dynamics, and structure in a tetrahedral network liquid journal January 2017
Bayesian analysis of single-particle tracking data using the nested-sampling algorithm: maximum-likelihood model selection applied to stochastic-diffusivity data journal January 2018
Non-Gaussianity, population heterogeneity, and transient superdiffusion in the spreading dynamics of amoeboid cells journal January 2018
Characterization of aqueous cellulose nanofiber dispersions from microscopy movie data of Brownian particles by trajectory analysis journal January 2019
Cage dynamics leads to double relaxation of the intermediate scattering function in a binary colloidal system journal January 2018
Non-Gaussian, non-ergodic, and non-Fickian diffusion of tracers in mucin hydrogels journal January 2019
Diffusive ferromagnetic roller gas journal January 2019
A comment on the position dependent diffusion coefficient representation of structural heterogeneity journal May 2018
DNA molecules deviate from shortest trajectory when driven through hydrogel journal October 2018
Fickian yet non-Gaussian diffusion in two-dimensional Yukawa liquids journal September 2019
Non-Gaussian normal diffusion induced by delocalization journal March 2016
Lévy flight with absorption: A model for diffusing diffusivity with long tails journal March 2017
Fickian yet non-Gaussian diffusion is not ubiquitous in soft matter journal October 2018
Non-Gaussian normal diffusion in a fluctuating corrugated channel journal October 2019
Connectivity, Dynamics, and Structure in a Tetrahedral Network Liquid preprint January 2016
Tracer diffusion in a sea of polymers with binding zones: mobile vs frozen traps text January 2016
Anomalous diffusion in time-fluctuating non-stationary diffusivity landscapes text January 2016
Non-Gaussian Normal Diffusion in a Fluctuating Corrugated Channel text January 2019

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