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• W251728678 abstract "Several methods for preparing suitable sols were used with moderate success. The methods used were selected on the basis of various favorable sol characteristics obtainable. A ferric oxide sol was prepared by oxidizing ferric chloride with boiling water. Portions of the resulting sol were then dialysed for varying periods of time. The result of dialysis was a difference in particle size and sol stebility upon dilution. A silver iodide sol exhibiting excellent stability but very small particle size (about 1 mu diameter) was prepared. The problem of small particle size was overcome by preparing sols contnining excess I/ sup -/ or excess Ag/sup +/, since it was observed that particle size was dependent on the excess I/sup -/ or Ag/sup +/ concentration. Qualitative observation of the electrophoretic mobility of the sols was studied to examine the reliability of equipment. Particles of about 2 mu were found most suitable since the cell construction presently deemed neceasary limite the examination of smaller particles. A variety of aerosols was prepared and studied including polymethylmethacrylate, sodium chloride, ammonium sulfate, naphthalene, and stearic acid. Carefully controlled concentrations and spraying conditions yielded particulates of approximately 1 mu or less in diameter. It was found that solventsmore » used in the production of the aerosols contribute significantly to its composition, hence it is necessary to establish behavior due solely to the solvent and its inherent contaminants. Experiments with polymethylmethacrylate aerosol indicated that x radiation resulted in the loss of detectable charging. This was confirmed by further modifications of the experimental apparatus. In the cases of sodium chloride and ammonium suifate aerosols, electron micrographs of samples collected on the walls of the conduits carrying the aerosols, following their exposure to the x-ray beam, showed insignificant particle deposition. Hence, almost complete discharging was apparently the only effect. In contrast, naphthalene and glycerine aerosols exhibited substantial charging effects when exposed to x radiation. These aerosols normally have small residual charges but exposure to x radiation greatly increased the charge both positively and negatively. A study was made of the effects of radiation on the filterability of glycerine and barium suifate aerosols. Various methods for preparing foams of uniform bubble size and high stability were examined. The foams produced were collected in graduated tubes and examined for stability by measuring their drainage rates, densities, and bubble sizes. A modification of a similar tube is being prepared for irradiation studies in the Cs/sup 137/ research irradiator. Emulsions of mineral oil in water were produced utilizing a wide variety of surfactants and peptizing agents. Of prime consideration was the desirability of producing a stable emulsion with a minimum of emulsifying agent. Emulsions thus produced were studied at pH values ranging from 1.75 to 9.82, and relationships of settling rate to pH were observed. Methods for observing the samples before and after irradiation were devised. (auth)« less" @default.
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• W251728678 date "1962-09-10" @default.
• W251728678 modified "2023-09-26" @default.
• W251728678 title "EFFECTS OF HIGH DENSITY IONIZING RADIATION ON COLLOIDAL SYSTEMS AND SUSPENSIONS. Quarterly Technical Status Report No. 2, June 1, 1962 to August 31, 1962" @default.
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