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Digitale Medien

Thermal conductivity measurements of pacific illite sediment (1986)

Hickox, C. E. ; McVey, D. F. ; Miller, J. B. ; [weitere]

Springer

International journal of thermophysics 7 (1986), S. 755-764

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ISSN: 1572-9567

Schlagwort(e): illite ; line-source probe ; sediment ; thermal conductivity

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract Results are reported for effective thermal conductivity measurements performed in situ and in core samples of illite marine sediment. The measurements were obtained during a recent oceanographic expedition to a study site in the north central region of the Pacific Ocean. This study was undertaken in support of the U.S. Subseabed Disposal Project, the purpose of which is to investigate the scientific feasibility of using the fine-grained sediments of the sea floor as a repository for high-level nuclear waste. In situ measurements were made and 1.5-m-long hydrostatic piston cores were taken, under remote control, from a platform that was lowered to the sea floor, 5844 m below sea level. The in situ measurement of thermal conductivity was made at a nominal depth of 80 cm below the sediment surface using a specially developed, line-source, needle probe. Thermal conductivity measurements in three piston cores and one box core (obtained several kilometers from the study site) were made on shipboard using a miniature needle probe. The in situ thermal conductivity was approximately 0.91 W · m−1 · K−1. Values determined from the cores were within the range 0.81 to 0.89 W · m−1 · K−1.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00503833

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Digitale Medien

129Xe NMR as a probe of polymer blends (1992)

Walton, J. H. ; Miller, J. B. ; Roland, C. M.

Bognor Regis [u.a.] : Wiley-Blackwell

Journal of Polymer Science Part B: Polymer Physics 30 (1992), S. 527-532

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ISSN: 0887-6266

Schlagwort(e): nuclear magnetic resonance (NMR) with 129Xe as probe of polymer blends ; blends, 129Xe as NMR Probe of ; rubbery polymer blends, 129Xe as NMR probe of ; Chemistry ; Polymer and Materials Science

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie , Physik

Notizen: The miscibility of two-component polymer blends has been investigated using xenon-129 (129Xe) nuclear magnetic resonance (NMR) to probe the phase morphology. The chemical shift of 129Xe dissolved in a given polymer is unique, thus heterogeneous blends with large domain sizes exhibit two 129Xe NMR lines. When a single resonance is obtained, the data are consistent with miscibility, yielding an upper bound on the domain size. The temperature dependence of the relative solubilities and chemical shifts of 129Xe dissolved in the pure components may allow a determination of the phase morphology in blends exhibiting a single resonance. The method is used to demonstrate that polychloroprene and 25% epoxidized 1,4-polyisoprene form a miscible blend.

Zusätzliches Material: 5 Ill.