Abstract
Abstract 1. The adsorption of water vapor by gelatin-dodecyl sulfate ion complexes and gelatin-dodecyl ammonium ion complexes has been measured. 2. The adsorption of water vapor by both those kinds of complexes has been found to be less than that by pure gelatin. 3. The amount of adsorption on the gelatin-dodecyl sulfate ion complexes is always smaller than on the gelatin-dodecyl ammonium ion complexes, and this fact indicates that the former complexes are more hydrophobic than the latter. 4. The adsorption isotherms have been interpreted by the B.E.T. theory and the amount of the first monolayer adsorption has been calculated. 5. In both types of complexes, there is a certain parallel correlation but no stoichiometric relationship between the reduction in the amount of the first monolayer adsorption and the amount of combined detergent.
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