Accessibility navigation

Effects of vertical confinement on gelation and sedimentation of colloids

Razali, A., Fullerton, C. J., Turci, F. ORCID:, Hallett, J. ORCID:, Jack, R. L. and Royall, C. P. (2017) Effects of vertical confinement on gelation and sedimentation of colloids. Soft Matter, 13 (17). pp. 3230-3239. ISSN 1744-6848

Full text not archived in this repository.

It is advisable to refer to the publisher's version if you intend to cite from this work. See Guidance on citing.

To link to this item DOI: 10.1039/C6SM02221A


We consider the sedimentation of a colloidal gel under confinement in the direction of gravity. The confinement allows us to compare directly experiments and computer simulations, for the same system size in the vertical direction. The confinement also leads to qualitatively different behaviour compared to bulk systems: in large systems gelation suppresses sedimentation, but for small systems sedimentation is enhanced relative to non-gelling suspensions , although the rate of sedimentation is reduced when the strength of the attraction between the colloids is strong. We map interaction parameters between a model experimental system (observed in real space) and computer simulations. Remarkably, we find that when simulating the system using Brownian dynamics in which hydrodynamic interactions between the particles are neglected, we find that sedimentation occurs on the same timescale as the experiments, however the thickness of the “arms” of the gel is rather larger in the experiments, compared with the simulations. An analysis of local structure in the simulations showed similar behaviour to gelation in the absence of gravity.

Item Type:Article
Divisions:No Reading authors. Back catalogue items
ID Code:101377
Publisher:Royal Society of Chemistry

University Staff: Request a correction | Centaur Editors: Update this record

Page navigation