TY - JOUR
T1 - Near-wall dynamics of concentrated hard-sphere suspensions
T2 - Comparison of evanescent wave DLS experiments, virial approximation and simulations
AU - Liu, Yi
AU - Bławzdziewicz, Jerzy
AU - Cichocki, Bogdan
AU - Dhont, Jan K.G.
AU - Lisicki, Maciej
AU - Wajnryb, Eligiusz
AU - Young, Y. N.
AU - Lang, Peter R.
N1 - Publisher Copyright:
© The Royal Society of Chemistry.
PY - 2015/8/4
Y1 - 2015/8/4
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=84941914473&partnerID=8YFLogxK
U2 - 10.1039/c5sm01624j
DO - 10.1039/c5sm01624j
M3 - Article
C2 - 26264420
AN - SCOPUS:84941914473
VL - 11
SP - 7316
EP - 7327
JO - Soft Matter
JF - Soft Matter
SN - 1744-683X
IS - 37
ER -