QUARTERLY REPORT NO.4 (Semifinal Report) RESEARCH ON SURFACE PROPERTIES OF FINE PARTICLES

摘要

Particle size measurements received primary attention in a preceding study, and surface area measurements have been investigated in both the preceding study and in the present work. In addition, the present work covers the initiation and first results of a study of catalytic activity as related to particle size, surface area, and other parameters.nSurface area, determined by either the liquid-phase adsorption of stearic acid or by gas adsorption methods employing a measurement of the rate of adsorption or utilizing a constant rate of gas addition, was studied. Results of stearic acid adsorption for a variety of materials have indicated agreement with gas adsorption results when the surface of the adsorbing material did not consist of capillary pores and cracks too small for the solvent and stearic acid to penetrate.