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• W2912642632 abstract "Microgel colloids exhibit a polymer collapse transition resulting in a large reduction in colloidparticle volume at high temperatures or pressures. They are of interest because of theirpotential for applications in areas, like drug delivery and chemical separation, that involvethe uptake, encapsulation and release of small or biological molecules. The goal of thiswork is to obtain a microscopic understanding of the internal structure and microscopicdynamics of microgels by examining the temperature and pressure dependence of the collapsetransition. Deuterium NMR (²H NMR) has been used to probe the microscopic dynamicsof crosslinked poly N-isopropylacrylamide (polynipam) chains, in microgel colloids, as afunction of temperature and pressure for a series of four crosslink densities (Cd). Eachcrosslinked microgel colloids was synthesized with deuteron labels on the nipam backbone (d3nipam). Macroscopic properties of unlabeled colloids having the same crosslink densities werecharacterized by dynamic light scattering (DLS) and rheology. Rheological characterizationas a function of temperature (T) and particle concentration (C), and for 4 crosslink densities,showed that the microgel viscosity decreases as temperature is increased. The Krieger-Dougherty model of the relative viscosity as a function of volume fraction was employedfor viscosity analysis. The measured viscosity in the colloidal regime (at high T, low C)collapsed onto one line when plotted against volume fraction. This yields a measure ofthe water content in the particles as function of T. The water volume fraction in themicrogel particle at 45ᴼC was always found to be 0.6 for any Cd. ²H NMR spectra ofthe d3 nipam suspensions for all Cd indicated freely moving chains at low temperature anda nearly immobilized fraction above 35ᴼC. This is consistent with DLS observations of atransition from swollen to collapsed colloids. Nipam segments in the collapsed phase ofthe d3 nipam suspension were more mobile than those in the dry powder. This suggestssignificant amounts of water in the collapsed phase, a finding consistent with the rheology observations. Variable pressure NMR (up to 90 MPa) showed a slight increase in transitiontemperature with pressure for all Cd values studied." @default.
• W2912642632 created "2019-02-21" @default.
• W2912642632 creator A5038627512 @default.
• W2912642632 date "2018-01-01" @default.
• W2912642632 modified "2023-09-24" @default.
• W2912642632 title "Deuterium nuclear magnetic resonance (NMR) and rheology of microgel colloids at ambient and high pressure" @default.
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• W2912642632 hasPublicationYear "2018" @default.
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