Properties of Decylammonium Chloride and Cesium Perfluorooctanoate at Interfaces and Standard Free Energy of Their Adsorption

✍ Scribed by B. Jańczuk; J.A.Méndez Sierra; M.L. González-Martı́n; J.M. Bruque; W. Wójcik

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 141 KB
• Volume: 192
• Category: Article
• ISSN: 0021-9797
• DOI: 10.1006/jcis.1997.5054

✦ Synopsis

tension (4,5). Standard free energy of adsorption for sur-Measurements of the surface tension of aqueous solutions of face-active solutes of aqueous solution at aqueous solutiondecylammonium chloride (DACl) and cesium perfluorooctanoate air (hydrocarbon) interfaces has been calculated by a num-(CsPFO) and the interfacial tension of DACl (CsPFO) solutionber of different methods from surface and interface tension decane and DACl (CsPFO) solution-benzene systems were made data (2). However, despite the large amount of surface and at 293 and 303 K. On the basis of these measurements, the adsorpinterface tension data in the literature and the variety of tion isotherms and the standard free energies of adsorption were methods available for calculating standard free energies of determined. Also, the standard free energy of adsorption was deadsorption, there is a lack of correlation between standard termined from the surface free energy of the tails of DACl and free energy of adsorption and surface free energy of the tail CsPFO and the interfacial free energy of the tail-water system.

It was found that the standard free energy of adsorption at a given and head of surfactant molecules.

temperature only slightly depends on the type of phase in contact

Recent studies (6-8) have proven that there is a relationwith the solutions of the surfactants and can be determined on ship between the free energy of micellization of surfactants the basis of the surface and interfacial free energy of systems in aqueous media and the free energy of interaction between including the tails of the surfactants. It was also found that stantails and heads of surfactants in water calculated on the basis dard free energy of adsorption depends on temperature, and is of the surface free energy components of surfactants.

considerably smaller for CsPFO than for DACl.