Decylammonium Chloride and Cesium Perfluorooctanoate Surface Free Energy and Their Critical Micelle Concentration

• Published in: Journal of colloid and interface science Vol. 184; no. 2; pp. 607 - 613
• Main Authors: Jańczuk, B., Méndez-Sierra, J.A., González-Martin, M.L., Bruque, J.M., Wójcik, W.
• Format: Journal Article
• Language: English
• Published: San Diego, CA Elsevier Inc 25.12.1996; Elsevier
• Subjects: acid-base interactions; cesium perfluorooctanoate; Chemistry; Colloidal state and disperse state; decylammonium chloride; electrostatic interactions; Exact sciences and technology; General and physical chemistry; interfacial free energy; Lifshitz–van der Waals interactions; Micelles. Thin films; micellization; decylammonium chloride; cesium perfluorooctanoate; acid-base interactions; Lifshitz–van der Waals interactions; interfacial free energy; electrostatic interactions; micellization; Anionic surfactant; Micellar critical concentration; Electrostatic interaction; Cationic surfactant; Surface tension; Thermodynamic properties; Experimental study; Primary amine
• ISSN: 0021-9797; 1095-7103
• DOI: 10.1006/jcis.1996.0658

Measurements of the surface tension of decylamine and perfluoroheptane and interfacial tension of water–perfluoroheptane were carried out. Measurements of the contact angle were also made for water, glycerol, formamide, diiodomethane, bromoform, and benzene on DACl and CsPFO layers formed on Teflon and on DACl and CsPFO pellets, as well as of zeta potential for surfactants adsorbed on latex. From the results obtained and the literature data the surface free energy of DACl and CsPFO for both tails and heads parts of their molecules, and their free energy of interaction through water were determined. It was shown that the free energy of interaction between –CH2– groups through water, determined from interfacial tension, is in agreement with that obtained from the relationship between logCMC and the number of carbon atoms in the chain of molecules of surfactants having the same head. It was also shown that there is agreement between the total free energy of interaction between molecules of surfactants through water and their critical micelle concentration (CMC).