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/ http://irep.iium.edu.my/70400/ 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

id	iium-70400
recordtype	eprints
spelling	iium-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. E-ISSN 1744-6848 https://pubs.rsc.org/en/content/articlelanding/2017/sm/c6sm02221a#!divAbstract
repository_type	Digital Repository
institution_category	Local University
institution	International Islamic University Malaysia
building	IIUM Repository
collection	Online Access
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/ http://irep.iium.edu.my/70400/ 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
first_indexed	2023-09-18T21:39:56Z
last_indexed	2023-09-18T21:39:56Z
_version_	1777413072399368192

Effects of vertical confinement on gelation and sedimentation of colloids

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