Intermolecular interactions between a dye and cationic surfactants: Effects of alkyl chain, head group, and counterion

Autor:	Afshin Asadzadeh Shahir, Morteza Moradi, Soheila Javadian, Hussein Gharibi, Mohammad Rashidi-Alavijeh, Ali Reza Tehrani-Bagha
Rok vydání:	2011
Předmět:	chemistry.chemical_classification Colloid and Surface Chemistry Conductometry Pulmonary surfactant Chemistry Critical micelle concentration Inorganic chemistry Thermodynamics of micellization Cationic polymerization Counterion Photochemistry Micelle Alkyl
Zdroj:	Colloids and Surfaces A: Physicochemical and Engineering Aspects. 380:119-127
ISSN:	0927-7757
DOI:	10.1016/j.colsurfa.2011.02.011
Popis:	The interactions between an anionic dye and cationic surfactants were investigated using surface tension measurements, spectroscopy, conductometry, and pulsed field gradient NMR (PFG-NMR). Spectroscopic and surface property characterization of the solution as a function of surfactant concentration in the presence of the dye revealed formation of three species: a dye–surfactant ion pair, small mixed aggregates of the dye and surfactant (below the critical micelle concentration (CMC) of these surfactants), and micelles composed of the cationic surfactant. Above the CMC, the dye reverted to its monomeric state or bound to the surface of the micelle. Chemometric resolution analysis confirmed the formation of three species. The hydrodynamic radii of the micelles were determined by self-diffusion coefficient measurements. The average size of the micelles was larger in the presence than in the absence of the dye. Regular solution theory was used to describe the synergistically enhanced ability to form mixed aggregates of dyes and surfactants.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::27c7c92e11f975f678715e520368c210 https://doi.org/10.1016/j.colsurfa.2011.02.011 Zobrazit plný text záznamu Full Text from ScienceDirect