Effects of concentration, temperature and solvent composition on density and apparent molar volume of the binary mixtures of cationic-anionic surfactants in methanol–water mixed solvent media

Abstract

The accurate measurements on density of the binary mixtures of cetyltrimethylammonium bromide and sodium dodecyl sulphate in pure water and in methanol(1) + water (2) mixed solvent media containing (0.10, 0.20, and 0.30) volume fractions of methanol at 308.15, 318.15, and 323.15 K are reported. The concentrations are varied from (0.03 to 0.12) mol.l-1 of sodium dodecyl sulphate in presence of ~ 5.0×10-4 mol.l-1 cetyltrimethylammonium bromide. The results showed almost increase in the densities with increasing surfactant mixture concentration, also the densities are found to decrease with increasing temperature over the entire concentration range, investigated in a given mixed solvent medium and these values are found to decrease with increasing methanol content in the solvent composition. The concentration dependence of the apparent molar volumes appear to be negligible over the entire concentration range, investigated in a given mixed solvent medium and the apparent molar volumes increase with increasing temperature and are found to decrease with increasing methanol content in the solvent composition.

Volumetric Properties of Sodium Lauroylsarcosinate in Aqueous Alcohol Solutions of Methanol, Ethanol, and 1-Propanol

“…Table 1 presents the density of water and aqueous alcohol solutions of various mass fractions of alcohol in the temperature range from 298.15 to 313.15 K. The density values are in close agreement as reported in the literature. 24,25,29 The variation of density as a function of the concentration of SLS is given in Tables 2−5, respectively, for water, methanol (aq), ethanol (aq), and 1-propanol (aq) and plotted as Supporting Information (Figures S1 to S4). As is evident, at constant temperature the density of the aqueous and aqueous alcohol solutions of SLS increases linearly with surfactant concentration.…”

“…The effect of alcohols on surfactant micellization can be rationalized in terms of penetration power of alcohol molecules into the stern layer of micelles and the solvent modifying ability of alcohols, the relative magnitude of both of which depends on the concentration of the alcohol used. , It is known that the volumetric properties serve as important tools which allow us to gain insight into the various solute–solute and solute–solvent interactions occurring in mixed systems . Although a lot of work has been done on short chain alcohol–surfactant systems, most of it concerns the effect of alcohols on the micellization process of conventional surfactants and surfactant mixtures. ,,,, Nevertheless, there are a few instances in the literature where one comes across a study of short chain alcohol–surfactant systems involving commercial surfactants in which the effect of alcohols on the volumetric properties has been studied. − Moreover, in many of their applications surfactants are used in concentrations higher than their CMC and therefore deserve attention. Sodium lauroylsarcosinate (SLS) is very popular in industrial and personal care applications because of its mild nature, good biodegradability, antimicrobial properties, and better stability toward hard water .…”

Density, Viscosity and Ultrasonic Velocity of Brij-35 in Presence of Water-Soluble Polymers

“…According to "flickering cluster" model of water, there are large void spaces within the hydrogen bonded framework of the water structure, the molecules may have penetration into the void spaces and may have positive interaction with water. The increase in viscosity due to increase in ion size, orientation of polar molecules by the ionic field, since the freedom of movements of these molecules is restricted; this generally results in a stiffening of the solution (Bhattarai, A., et al,2013;Chimankar, O. P., at al.,2010). Viscosity increases due to stronger hydrophilic and hydrophobic interactions in aqueous media the hydrophobic units of surfactant associate with each other forming hydrophobic domain, they play important role of intermolecular cross links which can lead to a significant increase in viscosity.…”

Influence of Imidazolium Ionic Liquids on the Interactions of Human Hemoglobin with DyCl3, ErCl3, and YbCl3 in Aqueous Citric Acid at T = (298.15, 303.15, and 308.15) K and 0.1 MPa

“…At very low LnCl 3 concentration (higher solvent mole fraction), the solute−solvent interactions dominate while solute−solute interactions can be ignored. As the concentration of LnCl 3 increases (solvent mole fraction decreases), there is a 68,69 The concentration independence of the apparent molar volume at infinite dilution, V ϕ 0 , of LnCl 3 is obtained by fitting the V ϕ values in the Redlich−Rosenfeld− Meyer eq 2: 54,55…”