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Effects of vertical confinement on gelation and sedimentation of colloids

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 comp...

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Main Authors: Razali, Azaima, Fullerton, Christopher J., Turci, Francesco, Hallett, James E., Jack, Rob L., Royall, C. Patrick
Format: Article
Language:English
English
Published: The Royal Society of Chemistry 2017
Subjects:
QC Physics
QD Chemistry
Online Access:http://irep.iium.edu.my/70400/1/confine_gel_sedim_razali.pdf
http://irep.iium.edu.my/70400/7/70400%20Effects%20of%20vertical%20confinement%20on%20gelation%20SCOPUS.pdf
http://irep.iium.edu.my/70400/
https://pubs.rsc.org/en/content/articlelanding/2017/sm/c6sm02221a#!divAbstract
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spelling my.iium.irep.704002019-07-12T04:00:31Z http://irep.iium.edu.my/70400/ Effects of vertical confinement on gelation and sedimentation of colloids Razali, Azaima Fullerton, Christopher J. Turci, Francesco Hallett, James E. Jack, Rob L. Royall, C. Patrick QC Physics QD Chemistry 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. An analysis of local structure in the simulations showed similar behaviour to gelation in the absence of gravity. The Royal Society of Chemistry 2017-05 Article PeerReviewed application/pdf en http://irep.iium.edu.my/70400/1/confine_gel_sedim_razali.pdf application/pdf en http://irep.iium.edu.my/70400/7/70400%20Effects%20of%20vertical%20confinement%20on%20gelation%20SCOPUS.pdf Razali, Azaima and Fullerton, Christopher J. and Turci, Francesco and Hallett, James E. and Jack, Rob L. and Royall, C. Patrick (2017) Effects of vertical confinement on gelation and sedimentation of colloids. Soft Matter, 13 (17). pp. 3230-3239. https://pubs.rsc.org/en/content/articlelanding/2017/sm/c6sm02221a#!divAbstract
institution Universiti Islam Antarabangsa Malaysia
building IIUM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider International Islamic University Malaysia
content_source IIUM Repository (IREP)
url_provider http://irep.iium.edu.my/
language English
English
topic QC Physics
QD Chemistry
spellingShingle QC Physics
QD Chemistry
Razali, Azaima
Fullerton, Christopher J.
Turci, Francesco
Hallett, James E.
Jack, Rob L.
Royall, C. Patrick
Effects of vertical confinement on gelation and sedimentation of colloids
description 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. An analysis of local structure in the simulations showed similar behaviour to gelation in the absence of gravity.
format Article
author Razali, Azaima
Fullerton, Christopher J.
Turci, Francesco
Hallett, James E.
Jack, Rob L.
Royall, C. Patrick
author_facet Razali, Azaima
Fullerton, Christopher J.
Turci, Francesco
Hallett, James E.
Jack, Rob L.
Royall, C. Patrick
author_sort Razali, Azaima
title Effects of vertical confinement on gelation and sedimentation of colloids
title_short Effects of vertical confinement on gelation and sedimentation of colloids
title_full Effects of vertical confinement on gelation and sedimentation of colloids
title_fullStr Effects of vertical confinement on gelation and sedimentation of colloids
title_full_unstemmed Effects of vertical confinement on gelation and sedimentation of colloids
title_sort effects of vertical confinement on gelation and sedimentation of colloids
publisher The Royal Society of Chemistry
publishDate 2017
url http://irep.iium.edu.my/70400/1/confine_gel_sedim_razali.pdf
http://irep.iium.edu.my/70400/7/70400%20Effects%20of%20vertical%20confinement%20on%20gelation%20SCOPUS.pdf
http://irep.iium.edu.my/70400/
https://pubs.rsc.org/en/content/articlelanding/2017/sm/c6sm02221a#!divAbstract
_version_ 1643619906092007424
score 13.211869

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