赤鉄鉱および石英に対するドデシル・アンモニウム・アセテートの吸着に関する考察

抄録

We reviewed the Gibbs' adsorption equation and the relationship between contact angle and surface coverage presented by Rehbinder or Cook from the adsorption isotherm of dodecylammonium acetate on hematite reported by Gaudin and Morrow.
New equation γls=αX+_b was proposed, where γls and X denote the interfacial tension between solid and liquid and the surface coverage respectively and both α and b are constants. It was shown that this equation agreed well with the results obtained from the data in the range of the concentrations which is of interest from the flotation standpoint.
The bend in the adsorption isotherm of dodecylammonium acetate on hematite was speculated to be the saturated point of adsorbed ion lain flat on the interface and corresponded to the surface coverage of 25% from the dimension of the adsorbed ion. The same condition may also exist in the adsorption isotherm on quartz.
Discussions were also made on the surface coverage required to give the proper flotation performance.