Temperature controlled comparative physico-chemical studies of DTAB and 12-2-12 Gemini surfactants in aqueous solutions of fructose, maltose and raffinose

摘要

The Micellar behaviour of synthesised cationic Gemini surfactant ethanediyl-1,2-bis (dimethyldodecylammonium bromide) and its single-chain counter-part i.e., Dodecyltrimethylammonium bromide (DTAB) in absence and presence of carbohydrates (fructose, maltose and raffinose) has been investigated. The conventional technique viz. surface tension measurements over a wide range of temperature, (293.15-313.15 K with an interval of 5 K) and spectroscopic method i.e. fluorescence probe at room temperature have been employed to determine critical micelle concentrations (CMCs) of both the surfactants. The decrease in CMC have been found for both the studied surfactants; however the effect being more prominent in case of Gemini surfactant (GS). From surface tension data, various interfacial parameters have been evaluated that reflects the presence of stronger electrostatic attractions between carbohydrates and the micelle of surfactants. The CMC values calculated using both the studies have been found to be in good agreement and corroborate each other's observations. (C) 2018 Published by Elsevier B.V.