Fundamental Studies on Interfacial Tensions in Flotations. III : Tilting-Plate Method of Determining Contact Angle and the Wetting Tension of Aqueous Solutions of Frothers for Paraffin-Wax
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For the study of the theory of flotation process as well as the flotation agents, the wettablility of paraffin-wax in aqueous solutions of pure frothers as iso-amyl alcohol, meta-cresol, a-terpineol, d-camphor and of a few commercial frothers were measured. By considering critically the reciprocal action of interfacial energies among solid, liquid and gas, the product of the surface tension of the liquid and the cosine of the angle of contact was selected as the wettability of solid against liquid. For the measurement of angle of contact, the tilting-plate method was selected and the modified form of the apparatus was developed, in which all parts in contact with liquid under test were made of glass only and the advancing and receding angles were measured more or less readily and precisely by agitating, circulating, and regulating the liquid at any temperature. For the surface tension of solutions, the values obtained by Du Nouy's tensiometer were utilized. A new wetting isotherm was derived, which held good for the wetting of paraffin-wax in solutions of pure as well as commercial frothers. The wetting isotherm was entirely similar in form to Szyszkovski's equation for water-air interface. By analogy, the wetting activity and the orientation of frothers at paraffin-water interface were considered and it was shown that wetting activity and the orientation of frothers at paraffin-water interface was similar to those at water-air interface.
- 東北大学の論文
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