QNS measurement of translational and notational water motion in polynox-water gels and hydrated artemia cysts

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dc.contributor.advisorRorschach, Harold E.en_US
dc.contributor.committeeMemberHannon, James P.en_US
dc.contributor.committeeMemberRoberts, Jabus B.en_US
dc.creatorHeidorn, Douglasen_US
dc.date.accessioned2018-12-18T21:18:11Zen_US
dc.date.available2018-12-18T21:18:11Zen_US
dc.date.issued1983en_US
dc.descriptionText includes handwritten formulasen_US
dc.description.abstractQuasielastic Neutron Scattering is a useful technique for obtaining information about the self-diffusion of water molecules in heterogeneous systems. Quasielastic neutron spectra have been obtained for hydrated brine shrimp (Artemia) cysts (1.2 g water/g solid) and water-polyox (1.67 g/g and 4 g/g) and deuterium-polyox (4 g/g) gels as a function of momentum transfer, Q. A triple axis spectrometer at the Oak Ridge research reactor, HFIR, was used to measure linewidths in the range .33-.1 THz at Q-values ranging from .5 to 1.9 A. A jump-diffusion model was used to describe the translational motion of the water molecules in both the brine shrimp and the polyox systems. The fitting routine employs Marquardt's algorithm which minimizes chi-squared in parameter space and determines parameters such as the Lorentzian linewidth as a function of Q . Results for the brine shrimp indicate that translational as well as rotational motion contributes to the linewidth. The measured linewidth is .329 THz at Q=.5 A, which is about twice the linewidth for pure water at the same O-value. Data for the 2% ployox in DgO mixture shows a large Lorentzian component. The magnitude of this component introduces large errors in the measurement of the motion of the water molecules in the water-polyox gels, due to the subtraction method used to determine the water spectra.en_US
dc.format.digitalOriginreformatted digitalen_US
dc.format.extent68 ppen_US
dc.identifier.callnoThesis Phys. 1983 Heidornen_US
dc.identifier.citationHeidorn, Douglas. "QNS measurement of translational and notational water motion in polynox-water gels and hydrated artemia cysts." (1983) Master’s Thesis, Rice University. <a href="https://hdl.handle.net/1911/104162">https://hdl.handle.net/1911/104162</a>.en_US
dc.identifier.digitalRICE1789en_US
dc.identifier.urihttps://hdl.handle.net/1911/104162en_US
dc.language.isoengen_US
dc.rightsCopyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.en_US
dc.titleQNS measurement of translational and notational water motion in polynox-water gels and hydrated artemia cystsen_US
dc.typeThesisen_US
dc.type.materialTexten_US
thesis.degree.departmentPhysicsen_US
thesis.degree.disciplineNatural Sciencesen_US
thesis.degree.grantorRice Universityen_US
thesis.degree.levelMastersen_US
thesis.degree.nameMaster of Artsen_US
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