Abstract
The surface nature of quartz powder pulverized in a hexane solution of cetyl alcohol or octadecyltriethoxysilane by means of a ball mill was investigated. The original quartz powder showed itself to be hydrophilic since it dispersed in water as well in an immiscible mixed dispersive medium. While quartz pulverized in a hexane solution of cetyl alcohol was hydrophilic since it dispersed in water, for an immiscible mixed dispersive medium, guartz after pulverization for 8hrs. dispersed in water, but that after pulverization for 16hrs, or longer, dispersed in hexane. These pulverized quartz powders were much more hydrophobic than the original quartz powder. The quarts powder after pulverization in a hexane solution of octadecyltriethoxysilane showed that the one after pulverization for 24hrs, dispersed in water, while the one after pulverization for 32hrs., or longer floats on water. Therefore, these quartz powder were found to be hydrophobic, but for an immiscible mixed disperse medium, the ones after pulverization for 8hrs, or longer, dispersed in the hexane phase. The characteristic absorptions due to the surface group on the quartz powder after pulverization for 64hrs. were observed in the infrared adsorption spectra. The evolved vapors of the surface group were observed in their pyrolysis curves. The increase in carbon content was found to be accompanied with an increase in surface area due to pulverization. Accordingly, the quartz powder was found to be surface-treated effectively due to pulverization. The quartz powder pulverized in the hexane solution of cetyl alcohol was hydrophilic, more hydrophobic than the original quartz powder. This is due to the formation of the equilmol OH-group as that of the alcoxy-group.
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