Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/6087
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dc.contributor.authorBasak, R.-
dc.contributor.authorBandyopadhyay, Ranjini-
dc.date.accessioned2014-12-23T08:00:36Z-
dc.date.available2014-12-23T08:00:36Z-
dc.date.issued2014-10-07-
dc.identifier.citationSoft Matter, 2014, Vol. 10, p7225en
dc.identifier.issn1744-6848 (Online)-
dc.identifier.issn1744-683X-
dc.identifier.urihttp://hdl.handle.net/2289/6087-
dc.descriptionRestricted Access.en
dc.description.abstractWhen calcium salts are added to an aqueous solution of polysaccharide pectin, ionic cross-links form between pectin chains, giving rise to a gel network in dilute solution. In this work, dynamic light scattering (DLS) is employed to study the microscopic dynamics of the fractal aggregates (flocs) that constitute the gels, while rheological measurements are carried out to study the process of gel rupture. As the calcium salt concentration is increased, DLS experiments reveal that the polydispersity of the flocs increase simultaneously with the characteristic relaxation times of the gel network. Above a critical salt concentration, the flocs become interlinked to form a reaction-limited fractal gel network. Rheological studies demonstrate that the limits of the linear rheological response and the critical stresses required to rupture these networks both decrease with the increase in salt concentration. These features indicate that the ion-mediated pectin gels studied here lie in a ‘strong link’ regime that is characterised by inter-floc links that are stronger than intra-floc links. A scaling analysis of the experimental data presented here demonstrates that the elasticities of the individual fractal flocs exhibit power-law dependences on the added salt concentration. We conclude that when both pectin and salt concentrations are increased, the number of fractal flocs of pectin increases simultaneously with the density of crosslinks, giving rise to very large values of the bulk elastic modulus.en
dc.language.isoenen
dc.publisherRoyal Society of Chemistryen
dc.relation.urihttp://dx.doi.org/10.1039/C4SM00748Den
dc.relation.urihttp://arxiv.org/abs/1406.7080en
dc.rights2014 Royal Society of Chemistryen
dc.subject12monthsen
dc.titleFormation and rupture of Ca2+ induced pectin biopolymer gels†en
dc.typeArticleen
Appears in Collections:Research Papers (SCM)

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