Challenges of kinetic measurements with a Bonse-Hart neutron diffractometer

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dc.contributor.authorGarvey, CJen_AU
dc.contributor.authorde Campo, Len_AU
dc.contributor.authorRehm, Cen_AU
dc.contributor.authorMuzny, CDen_AU
dc.contributor.authorHanley, HJMen_AU
dc.date.accessioned2021-08-09T22:38:38Zen_AU
dc.date.available2021-08-09T22:38:38Zen_AU
dc.date.issued2017-07-12en_AU
dc.date.statistics2021-08-08en_AU
dc.description.abstractHere we report on kinetic studies of the structural effects of applied shear on the gelation of silica using the Bonse-Hart type double crystal diffractometer (USANS) Kookaburra (ANSTO, Lucas Heights Australia). This instrument is able to cover a range of scattering vectors, 2.8 x 10-5 Å-1 < q < 4x 10-2 Å-1. The gelation process may be viewed structurally as the aggregation of sol particles into larger fractal aggregates, which then form a percolative network (final gel). In previous SANS work, it was shown that shear interrupted the formation of the network, inducing a new, shear dependent structure where there are structural changes on the micron length scale. Here we use USANS to understand the structural pathway that the gel follows to the steady shear state. USANS measurements are made point by point with each rotation step of the analyzer crystal (rocking curve), with counting statistics aimed at resolving a signal above the background. To gather a comprehensive rocking curve, a single measurement will take of the order of hours, putting the ability to cover interesting kinetics beyond the realm of an ordinary beamtime allocation. Here, USANS measurements were made on the gelling system, where each measurement consists of a restricted number of points in the rocking curve, with points selected according to their ability to characterize the intermediate structure.en_AU
dc.identifier.citationGarvey, C. J., de Campo, L., Rehm, C., Muzny, C. D., & Hanley, H. J. M. (2017). Challenges of kinetic measurements with a Bonse-Hart neutron diffractometer. Paper presented at ICNS 2017 (International Conference on Neutron Scattering), Daejeon, South Korea, 9 to 13 July 2017. Retrieved from: http://www.icns2017.org/program.phpen_AU
dc.identifier.conferenceenddate13 July 2017en_AU
dc.identifier.conferencenameICNS 2017 (International Conference on Neutron Scattering)en_AU
dc.identifier.conferenceplaceDaejeon, South Koreaen_AU
dc.identifier.conferencestartdate9 July 2017en_AU
dc.identifier.urihttp://www.icns2017.org/program.phpen_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/11287en_AU
dc.language.isoenen_AU
dc.publisherInternational Conference on Neutron Scatteringen_AU
dc.subjectKineticsen_AU
dc.subjectANSTOen_AU
dc.subjectAustraliaen_AU
dc.subjectDiffractometersen_AU
dc.subjectVectorsen_AU
dc.subjectGelationen_AU
dc.titleChallenges of kinetic measurements with a Bonse-Hart neutron diffractometeren_AU
dc.typeConference Abstracten_AU
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