Micellisation thermodynamics of sodium lauroylsarcosinate in water–alcohol binary mixtures

Abstract

Aggregation of sodium lauroylsarcosinate (SLS) in aqueous solutions of methanol, ethanol, propanol and ethylene glycol at 288-313 K has been determined from conductivity measurement in the range 0-20% v/v of additives. The precise values of the critical micelle concentration (CMC) and the degree of counter-ion dissociation of micelles were obtained at each temperature by fitting the specific conductivitysurfactant concentration curve to the integrated form of the Boltzmann-sigmoid equation. The CMC was found to increase with increase in additive concentrations in the case of methanol and ethylene glycol, while it decreases with increase in ethanol and propanol concentration. The equilibrium model of micelle formation was applied to obtain the thermodynamic parameters of micellisation. The Gibbs free energies were observed to vary only slightly with temperature and additive concentrations. Enthalpyentropy compensation was observed for all the systems with a constant compensation temperature of ≈300 K and negative compensation enthalpy.

Exploring Physicochemical Interactions of Different Salts with Sodium N-Dodecanoyl Sarcosinate in Aqueous Solution

“…21 Other anions, such as phosphate, thiosulfate, succinate, and oxalate, are highly polarizable due to high negative charge density, and as a result, A min values are high. 14 The data are given in Table S2.…”

“…10−13 SDDS is nonirritating and nonsensitizing to the human skin, and it possesses antimicrobial activities. 14 It should not be used in such cosmetic products where N -nitrososarcosine, a known carcinogen, can be formed. It is also used in formulating textile treatment agent.…”

Conductometric study of the mixing behaviour of sodium benzoate and salicylate with an anionic surfactant sodium lauroylsarcosinate

“…The cmc value for SLS of 0.0126 mol dm −3 was in reasonable agreement with that in the literature. [18][19][20] The MHC value obtained for NaBz is 0.54 mol dm −3 and 0.63 mol dm −3 for NaSal. These values are in close agreement with the literature values.…”

“…[18] The mixed surfactant properties of this surfactant with sodium dodecylsulphate (SDS) and the effects of short-chain alcohols on its micellisation have also been investigated by our group. [19,20] Sodium benzoate (NaBz) and sodium salicylate (NaSal) are salts of benzoic acid that are commonly used in preservation of foods and fruit juices besides being used as important components in the preparations of resins, plasticisers, dyes, inks, and pharmaceutical products. [21,22] They are also known to exhibit hydrotropic behaviour.…”

A Mathematical Approach to a More Accurate Determination of Critical Micelle Concentration and Other Thermodynamic Parameters of 14‐2‐14 Gemini Surfactant in Water–Organic Solvent Mixed Media at Variable Temperatures

“…Gemini surfactants have gained extensive consideration due to their enhanced interfacial and solution properties in comparison to the analogues of single head-single tail surfactants [33][34][35][36][37] and are in most of the instances, preferred over conventional surfactants [38]. However, it has been seen from the literature that the studies on the behavior of single chain surfactants are much more numerous [9][10][11][12][13][14][15][16][17][18][19][20][21][22] compared to gemini surfactants [23][24][25][26][27][28], although gemini surfactants show superior performance in many applications.…”