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|Title:||Energetic, surface-chemical and hydrodynamic studies on cetyltrimethylammonium bromide and sodium salicylate|
|Authors:||Roy, B K|
Moulik, S P
|Abstract:||Molecular interaction between cetyltrimethylammonium bromide (CTAS) and sodium salicylate (NaSal) has been investigated. A 1:1 complex is formed in solution. The mixed solution at this composition micellizes at 0.12 mmol dm-3 at 30o C , and the mixed micelle binds nearly 55% counter-ions. The molecular complex formation between CTAS and NaSal combination is an exothermic process. The micellization of CTAS-NaSal combination is also exothermic and a two-step process, the overall enthalpy values falling in the range of 10-15 kJ mol-1 at 30o C. The micellization process is prominently entropy controlled. The surface excess of CTAB and its minimum area at the air-water interface in NaSal, NaCI and NaSr environments have been determined. The CTAS-NaSal system is non-Newtonian and viscoelastic, and show shear thinning properties.|
|Appears in Collections:||IJC-A Vol.38A(01) [January 1999]|
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