Interfacial and aggregation properties of the binary mixture of decanoyl-N-methyl-glucamide and hexadecyltriphenylphosphonium bromide |
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Authors: | Pankaj Sehgal Osamu Kosaka Hidekazu Doe |
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Institution: | (1) Department of Chemistry, Graduate School of Science, Osaka City University, 3-3-138 Sugimoto Cho, Sumiyoshi-ku, Osaka 558-8585, Japan |
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Abstract: | The interfacial and aggregation behavior of the nonionic surfactant decanoyl-N-methyl-glucamide (Mega-10) with the cationic surfactant hexadecyltriphenylphosphonium bromide (HTPB) have been studied using
interfacial tension measurements and fluorescence techniques. From interfacial tension measurements, the critical micellar
concentrations (cmc) and various interfacial thermodynamic parameters have been evaluated. The experimental results were analyzed
in the context of the pseudophase separation model, the regular solution theory, and the Maeda’s approach. These approaches
allowed us to determine the interaction parameter and composition in the mixed state. By using the static quenching method,
the mean micellar aggregation numbers of pure and mixed micelles of HTPB+Mega-10 were obtained. It was found that that the
aggregation number decreases with increasing mole fraction of HTPB. This behavior is attributed to the presence of the bulky
head group of HTPB, which creates steric head group incompatibility and/or electrostatic repulsion. The micropolarity of the
micelle was monitored with pyrene fluorescence intensity ratio. It was observed that the increasing participation of HTPB
induces the formation of micelles with a hydrated structure. The polarization of the fluorescent probe Rhodamine B was monitored
in micellar medium and found to increase with the increase of ionic content. This behavior suggests the formation of mixed
micelles with a more ordered or rigid structure. |
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Keywords: | Hexadecyltriphenylphosphonium bromide (HTPB) Decanoyl-N-methyl-glucamide (Mega-10) Mixed monolayer Mixed micelles |
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