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The heating curves for a number of different materials, including metals and non-metals, were observed while being irradiated with a beam from a C02 gas laser. The radiant energy spectrum emitted by the materials was measured and recorded, and from this data the heating and cooling rates of the materials were determined. Infrared measurements in the 3 to 5 micron and 8 to 14 micron regions were performed using two Barnes Spectral-Master Radiometers. Data was recorded with both stationary and moving target materials to determine the effect of airflow on the heating and cooling characteristics of the materials. The observed initial heating curve for the solid materials up to the melting point are compared with a theoretical model. The procedure for calibration of the equipment and for data collection is also contained in this thesis.These measurements are important because the experimental conditions closely approximate realistic environmental conditions for materials which are used in different types of aircraft during flight.

The thermal conductivity of gases has been the subject of experimental investigations over a period of several decades (54). The thermal conductivity (hereafter simply referred to as the "conductivity"), being, from a physical point of view, one of the basic properties of a gas, much of the classical kinetic theory was concerned with its interpretation. Its measurement was to examine the validity of the theory. The limits of this validity were similar to those imposed on the theory by other gaseous properities, which lead to the concept of the "ideal gas". As to the conductivity, the behaviour of the majority of naturally occuring gases approximated closely that of the "ideal gas" under normal conditions, i.e. at moderate or room temperatures and a pressure range up to atmospheric pressure. Serious deviations from experimental data occured, however, when it was attempted to apply the theory to gases at higher temperatures and pressures.[...]

Theories of the metal-electrolyte interface are reviewed with particular attention to the prediction of thermodynamic quantities. A comparison of the different theories is made using a range of experimental results on Hg-aqueous electrolyte systems. Certain widespread failings of the models are revealed. These are identi- fied as being the results of a neglect of solvent structure and of chemical interactions. Next a solvent-free metal-molten salt system is investigated using a model based on the MSA. Thermodynamic properties, parti- cularly the capacitance and the potential at the point of zero charge and their variation with temperature, are calculated. The magnitudes for a range of ionic species are in agreement with experiments for Pb-alkali halide systems, but the (relatively weak) temperature dependence is not predicted correctly. The success of this application of the MSA compared to applications to aqueous systems shows the great importance of the solvent in determining the properties of these systems. To attempt to improve on the MSA model a new model based on the EXP approximation is developed. The predicted trend of the temperature dependence of capacitance is now given correctly but in other respects the predictions are worse than those of the MSA. In our first MSA model the metal is treated as a hard wall. A more realistic representation is now introduced which incorporates electron spill-out. By a phenomenological analysis the extent of spill-out into the electrolyte is estimated. No direct measurement of this quantity has been made. It is consistent with theoretical estimates made for aqueous systems when allowance ,is made for the effect of the solvent.

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Graduation date: 1998

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Thesis (Ph. D.)--Chemistry and Biochemistry, Georgia Institute of Technology, 2009. / Committee Chair: Wilkinson, Angus; Committee Member: Barefield, E. Kent; Committee Member: Snyder, Robert; Committee Member: Soper, Jake; Committee Member: Zhang, Z. John. Part of the SMARTech Electronic Thesis and Dissertation Collection.

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