# Browse Dissertations and Theses - Chemistry by Contributor "Jonas, Jiri"

• (1987)
The effects of temperature and pressure on the conformational isomerization of 1,1-difluorocyclohexane in solution have been studied using $\sp$F FT-NMR spectroscopy. The pressure dependence of the isomerization of ...

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• (1997)
The motional behavior of complex liquids of various phthalates and structurally related compounds has been investigated using $\sp{13}$C NMR relaxation measurements. Natural abundance $\sp{13}$C NMR spin-lattice relaxation ...

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• (1991)
Nuclear magnetic resonance (NMR) has been employed to study the confined geometry effects on reorientational dynamics of molecular liquids in porous media. The relative role of the pure geometrical confinement and the ...

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• (1988)
A quadrupole echo deuterium NMR lineshape study on polycrystalline samples of perdeuterated pyridine and selectively deuterated d$\sb2$-pyridine intercalated into 2H-TaS$\sb2$ was performed between 280K and 393K. The powder ...

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• (1994)
Raman spectroscopy is utilized to further the understanding of the molecular dynamics of liquids. The fluids are studied under conditions of high pressure and confined to spatial geometries whose dimensions approach the ...

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• (1991)
A variety of experimental techniques (multinuclear NMR, Raman, small angle neutron scattering, fluorescence polarization, viscosity, turbidity, static and dynamic light scattering experiments) have been employed to investigate ...

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• (1989)
The development of experimental high pressure high resolution $\sp1$H-decoupled $\sp{13}$C NMR spectroscopy is described. The design of an pulsed NMR spectrometer with increased sensitivity and versatility is presented and ...

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• (1997)
Pressure effects on rate constants for hydrogen exchange between N-methylacetamide (NMA) and water were measured at pressures up to 5 kbar at three different pH values and temperatures using proton/nitrogen-14 decoupled ...

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• (1987)
The spin-lattice relaxation times, viscosities, and densities of several supercooled viscous fluids have been previously measured as a function of temperature and pressure in order to investigate the adequacy of the modified ...

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• (1987)
The design and testing of a nuclear magnetic resonance probe for studying homogeneous catalysts from $-40\sp\circ$C to $100\sp\circ$C and pressures up to 4000 psi is described. Its significant features are a built-in ...

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• (1998)
A study of methyl and 2-ethylhexyl phthalates was done as a function of mole fraction in acetonitrile and 1,4-dioxane. The dilution allowed investigation into intramolecular non-coincidence, which has not previously been ...

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• (1991)
The effect of pressure on exchange rates, of varied systems in condensed media, were observed and typically related to stochastic theoretical models of exchange processes. Rates of exchange were determined using, the total ...

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• (1991)
The pressure and anesthetic effects on lineshapes and various relaxation times of phospholipid model membranes DPPC in multilamellar dispersions and in unilamellar vesicles have been investigated by using $\sp{31}$P NMR, ...

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• (1987)
The inorganic polymeric materials known as oxide glasses are normally prepared by the fusion of refractory oxides, followed by rapid cooling to avoid devitrification. A topic of current interest in materials research is ...

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• (1998)
Because of the extreme temperatures and pressures used to perform the cold denaturation studies, hydrogen exchange rates in model amides were measured at various temperatures and pressures to determine the effect of the ...

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• (1994)
Nuclear magnetic resonance (NMR) relaxation has been used for the study of confined geometry effects on the translational and rotational dynamics of molecular liquids in sol-gel prepared porous silica glasses. The NMR ...

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• (1993)
Dipalmitoylphosphatidylcholine/cholesterol bilayer membranes were studied using $\sp2$H and $\sp{31}$P NMR spectroscopy over the pressure range from 1 bar to 5 kbar. The phase diagram was constructed, structure and dynamics ...

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• (1988)
Solid solubilities of naphthalene in supercritical carbon dioxide have been measured near the upper critical end point of the binary mixture by using a novel, in situ NMR technique. The pressure-temperature trace of the ...

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• (1990)
Due to its unique advantages, the sol-gel process has attracted considerable attention from both technical and scientific points of view during the past decade. Compared with the conventional method, the sol-gel process ...

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• (1994)
The cold, heat, and pressure unfolding of RNase A has been studied by 1D and 2D $\sp1$H NMR spectroscopy, spin-lattice relaxation time measurements, and the pressure-jump hydrogen-exchange method. It was found that the ...

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