02327nas a2200241   4500008004100000022001400041245015600055210006900211260007300280300001000353490000800363520136000371653002201731653004101753653003901794653002801833653003101861100001801892700001901910700001601929700001301945856012701958       2006                        eng d  a0927-775700aMicellar behavior of dodecyldimethylethyl ammonium bromide and dodecyltrimethyl ammonium chloride in aqueous media in the presence of diclofenac sodium0 aMicellar behavior of dodecyldimethylethyl ammonium bromide and d  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcAPR  a17-250 v2783 a<p>The micellar properties of cationic surfactants (S) viz. dodecyldimethylethyl ammonium bromide (DDAB) and dodecyltrimethylammonium chloride (DTAC) in aqueous media in the presence of diclofenac sodium (D) have been investigated by spectroscopic and conductivity measurements. The UV-vis and H-1 NMR studies suggest possible packing of diclofenac sodiurn molecules in the micelles. The conductivity studies were carried out over the temperature range 288.15-308.15 K. The critical micelle concentration (cmc) and degree of counterion binding (beta) of the micelles were determined at different temperatures. Delay in micellisation was observed for both DDAB and DTAC. Thermodynamic parameters (Delta G(m)(0) Delta H-m(0) and Delta S-m(0).) for the micelle system were estimated by applying the charged pseudo-phase separation model. The results of the ternary S/D/W system were analysed in comparison with the reported results of binary SAV system. The Delta G(m)(0) values for the ternary S/D/W system in both the cases show an increase in comparison to the respective binary SAV system. However, Delta S-m(0) decreased with temperature and remained positive in both the systems. At lower temperatures, the micellisation was found to be entropy-driven while at higher temperatures it was enthalpy-dfiven. (c) 2005 Elsevier B.V. All rights reserved.</p>10adiclofenac sodium10adodecyldimethylethylammonium bromide10adodecyltrimethylammoniurn chloride10aElectrical conductivity10aspectroscopic measurements1 aMehta, S., K.1 aBhasin, K., K.1 aKumar, Anil1 aDham, S.  uhttps://library.ncl.res.in/content/micellar-behavior-dodecyldimethylethyl-ammonium-bromide-and-dodecyltrimethyl-ammonium-0