Physicochemical studies on the micellization behavior of cetylpyridinium chloride and triton X-100 binary mixtures in aqueous medium |
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Authors: | S Mukherjee D Mitra S C Bhattacharya A K Panda S P Moulik |
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Institution: | 1.Centre for Surface Science, Department of Chemistry,Jadavpur University,Kolkata,India;2.Department of Chemistry,University of North Bengal,Darjeeling,India |
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Abstract: | Physicochemistry of micellization of binary mixtures of cetylpyridinium chloride (CPC) and Triton X-100 (TX-100) have been investigated and the data collected have been analyzed and correlated. Tensiometric, conductometric, spectrophotometric,
calorimetric and polarographic methods have been employed in the study. Parameters like critical micellar concentration (CMC), counter-ion binding, energetics of micellization, interfacial surfactant adsorption and minimum area of amphiphile head
groups at CMC have been determined. The diffusion coefficients of pure and mixed micelles in solution have been determined
by the polarographic method. The regular solution theory of Rubingh has been considered to get information on the micellar
composition and their mutual interaction (synergistic for the studied system) in solution. The packing of the monomer in micelle
has been estimated to witness spherical geometry for CPC and its mixtures with TX-100, whereas the later has been found to
be spheroidal. Polarographic measurements have evidenced comparable diffusion coefficients of CPC and TX-100 micelles whereas
their mixed micelles have shown lower values with a minimum, at equimolar composition. |
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