Paper Title
Physicochemical Properties of Dodecyltrimethylammonium Bromide and Sodium Dodecyl Sulfate Rich Surfactants in Aqueous Medium at 293.15, 298.15 and 303.15 K

Abstract
The physicochemical properties of Dodecyltrimethylammonium Bromide (DTAB) and Sodium Dodecyl Sulfate (SDS) rich surfactants in aqueous medium have been studied by conductivity, surface tension, viscosity, density, sound velocity and spectroscopic measurements at 293.15, 298.15 and 303.15 K and at p = 0.1MPa. The concentration of DTAB varied from 0.0001 to 0.03 mol.L-1 in the presence of~ 0.01 mol�L-1 SDS and the concentration of SDS varied from 0.001 to 0.015 mol�L-1 in the presence of ~ 0.005 mol�L-1 DTAB, so that the concentrations of cationic (DTAB-rich) and anionic (SDS-rich) solutions were taken in the ratio of 3:1. The density ( ) and sound velocity ( ) data were used for calculating apparent molar volume ( ), friccohesity ( ), isentropic compressibility ( ), and viscosity ( ). This parameter reveals that the relative solute-solvent and solute-solute interactions of SDS-DTAB and DTAB-SDS, in aqueous medium have been depicted by utilizing physicochemical properties (PCPs). Keywords- Apparent molar volume, isentropic compressibility, friccohesity