Abstract of Thesis (PH. D.)--University of Michigan, 1941. / An article, by M.B. Standing and D.L. Katz, reprinted from Petroleum technology, November 1943.

From D. K. Brundage's thesis - University of Michigan. / An article, by J. O. Halford and Donald Brundage, reprinted from the Journal of the American Chemical Society, 64, 1942.

Thesis (Ph. D.)--University of Wisconsin--Madison, 1959. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 97-99).

Thesis (Ph.D.)--Lehigh University, 1994. / Adviser: Michael R. Notis. Includes bibliographical references.

The phase behaviour of methane at temperatures below 20°K is still not understood. There is recent evidence for a second phase transition at 8°K, in addition to the well known transition at 20.4°K. This second transition requires a long time to reach equilibrium. In our experiment, the nuclear magnetic resonance signal of the methane protons was monitored for a period of many hours at 1.2°K, in order to; determine whether a slow phase change occurred in the approach to equilibrium. This change would manifest itself in the width of the resonance line, which is sensitive to the local environment of the proton, and thus able to provide information about the crystal structure. No definite time variation of line width was observed. The line width increased by 15% from 4.2°K to 1.2°K. The second moment of the line also rose sharply as the temperature increased, indicating an increasing contribution to the spin-spin interaction from intra-molecular broadening. An approximate model yielded a correlation time for the intra-molecular term of the order of a microsecond. Significant differences between different methane samples indicate that sample preparation is important, and that the above results were for samples in some sort of metastable phase. / Science, Faculty of / Physics and Astronomy, Department of / Graduate

Solid-liquid phase equilibria studies were used to investigate possible compound formation in solutions of (i) N,N-dimethylformamide (DMF) and (ii) N,N-dimethylacetamide (DMA) with a series of halogenated hydrocarbons that were selected to give a wide range of acceptor properties. Solid 1:1 intermolecular compounds were identified from solutions of (i) DMF and (ii) DMA with CCl_4, CBrCl_3, and C_6H_5CCl_3. The intermolecular compounds (DMF)_2•CCl_4 and (DMF)_2•CBrCl_3 were also found. The results suggest charge transfer from DMF or DMA to the chlorine atoms of the acceptor molecule as the process for compound formation. Thermal methods were used to determine with high precision the solid-liquid phase equilibria diagram for the sodium-cesium system. Results differ greatly from those of earlier workers, especially near the eutectic composition where differences in melting points as large as 35°K occur. Although not conclusive, results support the proposal that the peritectic halt results from the formation of an Na_2Cs intermetallic compound by a very sluggish reaction. Thermal methods were also used to determine the mesophase transition temperatures for cholesteryl formate.

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