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dc.contributor.authorKeshavarz, Bavand
dc.contributor.authorRodrigues, Donatien Gomes
dc.contributor.authorChampenois, Jean-Baptiste
dc.contributor.authorFrith, Matthew G
dc.contributor.authorIlavsky, Jan
dc.contributor.authorGeri, Michela
dc.contributor.authorDivoux, Thibaut
dc.contributor.authorMcKinley, Gareth H
dc.contributor.authorPoulesquen, Arnaud
dc.date.accessioned2022-01-11T17:49:17Z
dc.date.available2022-01-11T17:49:17Z
dc.date.issued2021
dc.identifier.urihttps://hdl.handle.net/1721.1/138880
dc.description.abstractColloidal gels result from the aggregation of Brownian particles suspended in a solvent. Gelation is induced by attractive interactions between individual particles that drive the formation of clusters, which in turn aggregate to form a space-spanning structure. We study this process in aluminosilicate colloidal gels through time-resolved structural and mechanical spectroscopy. Using the time–connectivity superposition principle a series of rapidly acquired linear viscoelastic spectra, measured throughout the gelation process by applying an exponential chirp protocol, are rescaled onto a universal master curve that spans over eight orders of magnitude in reduced frequency. This analysis reveals that the underlying relaxation time spectrum of the colloidal gel is symmetric in time with power-law tails characterized by a single exponent that is set at the gel point. The microstructural mechanical network has a dual character; at short length scales and fast times it appears glassy, whereas at longer times and larger scales it is gel-like. These results can be captured by a simple three-parameter constitutive model and demonstrate that the microstructure of a mature colloidal gel bears the residual skeleton of the original sample-spanning network that is created at the gel point. Our conclusions are confirmed by applying the same technique to another well-known colloidal gel system composed of attractive silica nanoparticles. The results illustrate the power of the time–connectivity superposition principle for this class of soft glassy materials and provide a compact description for the dichotomous viscoelastic nature of weak colloidal gels.en_US
dc.language.isoen
dc.publisherProceedings of the National Academy of Sciencesen_US
dc.relation.isversionof10.1073/PNAS.2022339118en_US
dc.rightsArticle is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.en_US
dc.sourcePNASen_US
dc.titleTime–connectivity superposition and the gel/glass duality of weak colloidal gelsen_US
dc.typeArticleen_US
dc.identifier.citationKeshavarz, Bavand, Rodrigues, Donatien Gomes, Champenois, Jean-Baptiste, Frith, Matthew G, Ilavsky, Jan et al. 2021. "Time–connectivity superposition and the gel/glass duality of weak colloidal gels." Proceedings of the National Academy of Sciences of the United States of America, 118 (15).
dc.contributor.departmentMassachusetts Institute of Technology. Department of Mechanical Engineering
dc.contributor.departmentMultiScale Materials Science for Energy and Environment, Joint MIT-CNRS Laboratory
dc.relation.journalProceedings of the National Academy of Sciences of the United States of Americaen_US
dc.eprint.versionFinal published versionen_US
dc.type.urihttp://purl.org/eprint/type/JournalArticleen_US
eprint.statushttp://purl.org/eprint/status/PeerRevieweden_US
dc.date.updated2022-01-11T17:38:50Z
dspace.orderedauthorsKeshavarz, B; Rodrigues, DG; Champenois, J-B; Frith, MG; Ilavsky, J; Geri, M; Divoux, T; McKinley, GH; Poulesquen, Aen_US
dspace.date.submission2022-01-11T17:38:52Z
mit.journal.volume118en_US
mit.journal.issue15en_US
mit.licensePUBLISHER_POLICY
mit.metadata.statusAuthority Work and Publication Information Neededen_US


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