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• W1481998303 abstract "Understanding the ways that matter deforms andflows, which is the focus of the branch of science known asrheology, is essential for the efficient processing and properfunction of such practically and technologically importantmaterials as plastics, paints, oil-drilling fluids, and consumerproducts. Rheology is also powerful from a scientific perspectivebecause of the correlation between rheological properties and thestructure and behavior of matter on microscopic and molecularscales. The developing sub-field of microrheology, which explicitlyexamines flow and deformation behavior on microscopic lengthscales, provides additional clarity to this connection betweenrheology and microstructure. Aging materials, whose rheologicalproperties evolve over time, are one class of materials that are ofsignificant scientific and practical interest for their rheologicalbehavior. Also, the unique field-responsive rheological propertiesof magnetorheological (MR) suspensions, which can be tuned with anapplied magnetic field, have been used to create active vibrationdamping systems in such diverse applications as seismic vibrationcontrol and prosthetics. A material that undergoes rheologicalaging and that has received much attention from soft matterresearchers is the synthetic clay Laponite® . This material isattractive as a rheological modifier in industrial applications andconsumer products because a rich array of rheological properties,including a yield stress, viscoelasticity, and a shear-thinningviscosity, can be achieved at very low concentrations in aqueousdispersions (~ 1 w%). Though this behavior has been investigatedextensively using traditional 'bulk' rheology, a number ofimportant questions remain regarding the nature of the dispersionmicrostructure. The techniques of microrheology, in whichrheological properties are extracted from the motion of embeddedmicroscopic probe particles, could help to elucidate the connectionbetween microstructure and rheology in this material.Microrheological studies can be performed using passive techniques,in which probes are subject only to thermal motion, and activetechniques, in which external forces are applied to probes. Becauseaqueous Laponite® dispersions exhibit a significant yield stress,they could be beneficial as novel matrix fluids formagnetorheological suspensions. MR fluids consist of a suspensionof microscopic magnetizable particles in a non-magnetic matrixfluid. When an external magnetic field is applied, the particlesattract each other and align in domain-spanning chains ofparticles, resulting in significant and reversible changes inrheological properties. Because of the typically large densitydifference between the matrix fluid and the suspended magneticparticles, however, sedimentation is often problematic in MRfluids. A yield stress matrix fluid such as an aqueous Laponite®dispersion could help address this issue. In this thesis, bulkrheology and microrheology experiments are combined in order toprovide a thorough…" @default.
• W1481998303 created "2016-06-24" @default.
• W1481998303 creator A5073728116 @default.
• W1481998303 date "2012-01-01" @default.
• W1481998303 modified "2023-09-23" @default.
• W1481998303 title "Bulk and micro-scale rheology of an aging, yield stress fluid, with application to magneto-responsive systems" @default.
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