Abstract
The viscoelastic behavior of concentrated dispersions of adhesive hard spheres was investigated. By changing the temperature, the interaction potential of the particles was varied from a hard sphere repulsion to a strong attraction. Using torsion resonators and a nickel tube resonator the complex viscosity was measured in the frequency range 70–250 000 Hz. The results were described on the basis of a simple mechanical model in terms of a series of relaxation times and a single relaxation strength. The temperature dependence of the longest relaxation time and the relaxation strength indicated that the system undergoes a kinetic transition with decreasing temperature. The transition could be identified with the percolation threshold. Above the transition temperature where the dispersion is in a stable, fluid state, linear viscoelastic behavior is observed. Below the percolation threshold but still in the one-phase region, nonlinear viscoelasticity was measured, even at the smallest strains.
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Dates
Type | When |
---|---|
Created | 23 years, 1 month ago (July 26, 2002, 8:12 a.m.) |
Deposited | 1 year, 7 months ago (Feb. 6, 2024, 7:41 a.m.) |
Indexed | 1 year, 7 months ago (Feb. 6, 2024, 8:10 a.m.) |
Issued | 31 years, 2 months ago (July 1, 1994) |
Published | 31 years, 2 months ago (July 1, 1994) |
Published Print | 31 years, 2 months ago (July 1, 1994) |
@article{Woutersen_1994, title={Linear viscoelasticity in dispersions of adhesive hard spheres}, volume={101}, ISSN={1089-7690}, url={http://dx.doi.org/10.1063/1.468164}, DOI={10.1063/1.468164}, number={1}, journal={The Journal of Chemical Physics}, publisher={AIP Publishing}, author={Woutersen, A. T. J. M. and Mellema, J. and Blom, C. and de Kruif, C. G.}, year={1994}, month=jul, pages={542–553} }