title: Mixed micelle behavior of Pluronic L64 and Triton X-100 with conventional and dimeric cationic surfactants.
abstract: The mixed micellar properties of a triblock copolymer, Pluronic L64, (EO)13(PO)30(EO)13, and a nonionic surfactant, Triton X-100, in aqueous solution with conventional alkyl ammonium bromides and their dimeric homologues were investigated with the help of fluorescence and cloud point measurements. The composition of mixed micelles and the interaction parameter, beta, evaluated from the critical micelle concentration (cmc) data for different mixtures using Rubingh's and Motomura's theories are discussed. It has been observed that the mixed micelle formation between monomeric/dimeric alkyl ammonium bromides and L64 was due to synergistic interactions which increase with the increase in hydrophobicity of the cationic component. On the other hand, synergistic mixing was observed in the mixed micelles of Triton X-100 and monomeric cationic surfactants, the magnitude of which decreases slightly with the increase in hydrophobicity of the cationic component. Antagonistic interactions were observed in the case of Triton X-100 and dimeric cationic surfactants.
authors.affiliation: Department of Chemistry, Guru Nanak Dev University, Amritsar 143005, Punjab, India. ms_bakshi@yahoo.com
authors.forename: Mandeep Singh
authors.initials: MS
authors.lastname: Bakshi
authors.forename: Shweta
authors.initials: S
authors.lastname: Sachar
authors.forename: Kulbir
authors.initials: K
authors.lastname: Singh
authors.forename: Arifa
authors.initials: A
authors.lastname: Shaheen
mesh_terms: D002412:Cations; D019281:Dimerization; D008823:Micelles; D017830:Octoxynol / Q000737:chemistry*; D020442:Poloxamer / Q000737:chemistry*; D000644:Quaternary Ammonium Compounds / Q000737:chemistry; D013050:Spectrometry, Fluorescence; D013501:Surface-Active Agents / Q000737:chemistry*; D014867:Water / Q000737:chemistry
chemical_list: D002412:Cations; D008823:Micelles; D000644:Quaternary Ammonium Compounds; D013501:Surface-Active Agents; D014867:Water; D020442:Poloxamer; D017830:Octoxynol; C514452:pluronic L64