Study of Methyl Orange-Cetyltrimethyl Ammonium Bromide Interaction by Conductivity Method in Methanol-Water Mixed Solvent Media

Abstract

The interaction of an anionic dye (Methyl Orange) with cationic surfactant (Cetyltrimethylammonium Bromide, CTAB) in the series of solvent containing variable compositions of methanol-water mixture (10%, 20%, 30% and 40%) was studied at room temperature (31±2 o C). Conductivity measurements were done for the investigation of interaction of dyes. The specific conductance of 6.58x10-5 M to 59.22x10 M surfactant (CTAB) and these surfactants with 1.008x10 -3 M dye (MO) mixtures were noted at room temperature. A theoretical model was used to calculate conductance ratio from the data of measured specific conductance values.Values of conductance ratio of CTAB-MO mixtures were found to be all less than 1 which indicated that CTAB-MO dye -surfactant mixture exert significant influence on the degree of interaction.

Thermodynamic Studies of the Interactions of Cetyltrimethyl Ammonium Bromide (Ctab) and Methyl Orange Dye in Ethanol-Water Mixed Solvents

“…There is observed increase in CMC with temperature rise. The effect of temperature on the CMC of surfactant solutions is usually influenced by (1) decrease in hydration of hydrophilic head-group with increase in temperature which favours micelle formation and so value of CMC decreases and (2) rise in temperature may cause breakdown of water structure surrounding the hydrophobic group resulting in water-hydrophobic chain contact (25).…”