Near-wall dynamics of concentrated hard-sphere suspensions: Comparison of evanescent wave DLS experiments, virial approximation and simulations
Document Type
Article
Publication Date
8-4-2015
Abstract
In this article we report on a study of the near-wall dynamics of suspended colloidal hard spheres over a broad range of volume fractions. We present a thorough comparison of experimental data with predictions based on a virial approximation and simulation results. We find that the virial approach describes the experimental data reasonably well up to a volume fraction of ∅ ≈ 0.25 which provides us with a fast and non-costly tool for the analysis and prediction of evanescent wave DLS data. Based on this we propose a new method to assess the near-wall self-diffusion at elevated density. Here, we qualitatively confirm earlier results [Michailidou, et al., Phys. Rev. Lett., 2009, 102, 068302], which indicate that many-particle hydrodynamic interactions are diminished by the presence of the wall at increasing volume fractions as compared to bulk dynamics. Beyond this finding we show that this diminishment is different for the particle motion normal and parallel to the wall.
Identifier
84941914473 (Scopus)
Publication Title
Soft Matter
External Full Text Location
https://doi.org/10.1039/c5sm01624j
e-ISSN
17446848
ISSN
1744683X
PubMed ID
26264420
First Page
7316
Last Page
7327
Issue
37
Volume
11
Grant
CBET-1059745
Fund Ref
European Commission
Recommended Citation
Liu, Yi; Bławzdziewicz, Jerzy; Cichocki, Bogdan; Dhont, Jan K.G.; Lisicki, Maciej; Wajnryb, Eligiusz; Young, Y. N.; and Lang, Peter R., "Near-wall dynamics of concentrated hard-sphere suspensions: Comparison of evanescent wave DLS experiments, virial approximation and simulations" (2015). Faculty Publications. 6857.
https://digitalcommons.njit.edu/fac_pubs/6857
