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Micron-scale restructuring of gelling silica subjected to shear

de Campo, Liliana; Garvey, Christopher J; Muzny, Chris; Rehm, Christine; Hanley, Howard

Description

Hypothesis/objective We examine the time dependent viscometric behavior of a well-defined system of gelling colloidal silica and how this behavior may be understood from a simple theoretical model which incorporates the microstructure of the gel. The ultra-small angle neutron scattering (USANS) technique is used to interrogate structure during the gelation process. Experiments The investigations focused on a system where both particles and interactions are well-defined: 7 nm silica...[Show more]

dc.contributor.authorde Campo, Liliana
dc.contributor.authorGarvey, Christopher J
dc.contributor.authorMuzny, Chris
dc.contributor.authorRehm, Christine
dc.contributor.authorHanley, Howard
dc.date.accessioned2020-06-02T03:55:18Z
dc.identifier.issn0021-9797
dc.identifier.urihttp://hdl.handle.net/1885/204752
dc.description.abstractHypothesis/objective We examine the time dependent viscometric behavior of a well-defined system of gelling colloidal silica and how this behavior may be understood from a simple theoretical model which incorporates the microstructure of the gel. The ultra-small angle neutron scattering (USANS) technique is used to interrogate structure during the gelation process. Experiments The investigations focused on a system where both particles and interactions are well-defined: 7 nm silica particle acid-treated aqueous solution subjected to a constant applied shear in Couette geometry. Ultra-small angle neutron scattering (USANS) time-dependent scattering intensities were measured at wave vectors, q, in the range, 1.0 × 10−3 ≤ q/nm ≤ 7.3 × 10−2 coupled with viscosity data recorded simultaneously. The interpretation of the USANS scattering data is reliant on an isotropic sample. This assumption has been investigated, over a limited range of scattering vectors, using more suitable small angle neutron scattering (SANS) instrumentation with a restricted q-range. Findings The first recorded direct kinetic measurements of the micron-scale structure in a gelling system. A critical micro-structural feature of the intensity-viscosity time behavior of a gelling colloid subjected to a shear is the cluster size. A viscosity/intensity coupling observed at the time of a viscosity maximum that corresponds to a time-dependent critical stress and speculated to be independent of the wave vector over a wide q-range.
dc.description.sponsorshipThis work benefited from the use of the SasView application, originally developed under NSF Award DMR-0520547. SasView also contains code developed with funding from the EU Horizon 2020 programme under the SINE2020 project Grant No 654000
dc.format.mimetypeapplication/pdf
dc.language.isoen_AU
dc.publisherAcademic Press
dc.rightsCopyright © 2018 Published by Elsevier Inc
dc.sourceJournal of Colloid and Interface Science
dc.titleMicron-scale restructuring of gelling silica subjected to shear
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume533
dc.date.issued2019
local.identifier.absfor020405 - Soft Condensed Matter
local.identifier.absfor030606 - Structural Chemistry and Spectroscopy
local.identifier.ariespublicationu3102795xPUB298
local.publisher.urlhttps://www.elsevier.com/en-au
local.type.statusPublished Version
local.contributor.affiliationde Campo, Liliana, Australian Nuclear Science and Technology Organisation (ANSTO)
local.contributor.affiliationGarvey, Christopher J, Ausralian Nuclear Science and Technology Organisation
local.contributor.affiliationMuzny, Chris, National Institute of Standards and Technology
local.contributor.affiliationRehm, Christine, Australian Nuclear Science and Technology Organisation (ANSTO)
local.contributor.affiliationHanley, Howard, College of Science, ANU
local.description.embargo2037-12-31
local.bibliographicCitation.startpage136
local.bibliographicCitation.lastpage143
local.identifier.doi10.1016/j.jcis.2018.08.024
local.identifier.absseo970103 - Expanding Knowledge in the Chemical Sciences
local.identifier.absseo970102 - Expanding Knowledge in the Physical Sciences
dc.date.updated2019-12-19T07:07:19Z
local.identifier.scopusID2-s2.0-85052329501
CollectionsANU Research Publications

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