DOI: 10.1063/1.444146. Dynamic behavior of silica dispersions studied near the optical matching point

Dynamic behavior of silica dispersions studied near the optical matching point

10.1063/1.444146

Crossref journal-article

AIP Publishing

The Journal of Chemical Physics (317)

Abstract

Photon correlation spectroscopy experiments on silica particles dispersed in cyclohexane over a large concentration range and near the optical matching point have been explained by the occurrence of two different relaxation modes: one mode due to the collective diffusion of the particles and the other mode due to the self-diffusion. This is in agreement with the theoretical considerations of Weissman and Pusey. In the diluted region, information has been obtained about the behavior of the self-diffusion coefficient at zero wave vector (K) as a function of the particle volume fraction (φ). We found that the following relation exists: Ds(K = 0) = D0(1 + k′sφ), where D0 is the diffusion coefficient at infinite dilution and the constant ks′ has a value of −2.7±0.5. The concentration dependent behavior of the collective and self-diffusion coefficient has further been compared with the results of sedimentation and viscosity measurements. At high particle concentrations we observed that the relation between collective diffusion and sedimentation by means of the generalized Einstein relation has been confirmed qualitatively. The self-diffusion coefficient appeared to be inversely proportional to the viscosity of the solution. The sedimentation experiments have been found to be in agreement with the theories of Reed and Anderson over the whole concentration range, while at high particle volume fractions the theory of Lekkerkerker seemed to reasonably fit. Finally, we observed at φ≳0.40 that numerically, the values of the collective and self-friction coefficient are nearly the same.

Bibliography

Kops-Werkhoven, M. M., & Fijnaut, H. M. (1982). Dynamic behavior of silica dispersions studied near the optical matching point. The Journal of Chemical Physics, 77(5), 2242â2253.

Authors 2

M. M. Kops-Werkhoven (first)
H. M. Fijnaut (additional)

References 47 Referenced 124

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Dates

Type	When
Created	22 years, 5 months ago (Feb. 28, 2003, 11:32 a.m.)
Deposited	1 year, 6 months ago (Feb. 9, 2024, 7:16 p.m.)
Indexed	3 months ago (May 21, 2025, 9:26 a.m.)
Issued	42 years, 11 months ago (Sept. 1, 1982)
Published	42 years, 11 months ago (Sept. 1, 1982)
Published Print	42 years, 11 months ago (Sept. 1, 1982)

Funders 0

None

BibTeX

@article{Kops_Werkhoven_1982, title={Dynamic behavior of silica dispersions studied near the optical matching point}, volume={77}, ISSN={1089-7690}, url={http://dx.doi.org/10.1063/1.444146}, DOI={10.1063/1.444146}, number={5}, journal={The Journal of Chemical Physics}, publisher={AIP Publishing}, author={Kops-Werkhoven, M. M. and Fijnaut, H. M.}, year={1982}, month=sep, pages={2242–2253} }

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