Micron-scale restructuring of gelling silica subjected to shear
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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.author | de Campo, Liliana | |
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dc.contributor.author | Garvey, Christopher J | |
dc.contributor.author | Muzny, Chris | |
dc.contributor.author | Rehm, Christine | |
dc.contributor.author | Hanley, Howard | |
dc.date.accessioned | 2020-06-02T03:55:18Z | |
dc.identifier.issn | 0021-9797 | |
dc.identifier.uri | http://hdl.handle.net/1885/204752 | |
dc.description.abstract | 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 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.sponsorship | This 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.mimetype | application/pdf | |
dc.language.iso | en_AU | |
dc.publisher | Academic Press | |
dc.rights | Copyright © 2018 Published by Elsevier Inc | |
dc.source | Journal of Colloid and Interface Science | |
dc.title | Micron-scale restructuring of gelling silica subjected to shear | |
dc.type | Journal article | |
local.description.notes | Imported from ARIES | |
local.identifier.citationvolume | 533 | |
dc.date.issued | 2019 | |
local.identifier.absfor | 020405 - Soft Condensed Matter | |
local.identifier.absfor | 030606 - Structural Chemistry and Spectroscopy | |
local.identifier.ariespublication | u3102795xPUB298 | |
local.publisher.url | https://www.elsevier.com/en-au | |
local.type.status | Published Version | |
local.contributor.affiliation | de Campo, Liliana, Australian Nuclear Science and Technology Organisation (ANSTO) | |
local.contributor.affiliation | Garvey, Christopher J, Ausralian Nuclear Science and Technology Organisation | |
local.contributor.affiliation | Muzny, Chris, National Institute of Standards and Technology | |
local.contributor.affiliation | Rehm, Christine, Australian Nuclear Science and Technology Organisation (ANSTO) | |
local.contributor.affiliation | Hanley, Howard, College of Science, ANU | |
local.description.embargo | 2037-12-31 | |
local.bibliographicCitation.startpage | 136 | |
local.bibliographicCitation.lastpage | 143 | |
local.identifier.doi | 10.1016/j.jcis.2018.08.024 | |
local.identifier.absseo | 970103 - Expanding Knowledge in the Chemical Sciences | |
local.identifier.absseo | 970102 - Expanding Knowledge in the Physical Sciences | |
dc.date.updated | 2019-12-19T07:07:19Z | |
local.identifier.scopusID | 2-s2.0-85052329501 | |
Collections | ANU Research Publications |
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