Study on the Effects of Biologically Active Amino Acids on the Micellization of Anionic Surfactant Sodium Dodecyl Sulfate (SDS) at Different Temperatures (original) (raw)
2022, Chemistry
The micellar properties of the anionic surfactant, sodium dodecyl sulfate (SDS) are modified by the biologically active amino acids. Amino acids (AAs) have experienced a variety of interactions and are proposed to influence SDS micelles due to their nominated hydrophobic interactions. The present study determines the critical micellar concentration (CMC) of SDS in aqueous solutions as well as in amino aqueous solutions. Three amino acids (glutamic acid, histidine, and tryptophan) are considered here. The conductometric measurements were carried out using a wide range of SDS concentrations at different temperatures. Surface tension experiments have also been applied to estimate many surface parameters including surface excess concentration (Γmax), surface occupied area per surfactant molecule (Amin), surface tension at CMC (γcmc), surface pressure at CMC (Πcmc) and Gibbs free energy of adsorption (∆Gads°), enthalpy ∆Hm° and the critical packing parameter (CPP). Interestingly, CMC val...
Related papers
The surface tension and fluorescence measurements have been carried out to study the interactions present between anionic surfactant, sodium dodecyl benzene sulfonate (SDBS) and cationic surfactant, dodecyltrimethylammonium bromide (DTAB), in aqueous solution, in presence and absence of additives (glutamine, histidine and methionine) at different composition and temperature. Critical micelle concentrations (CMCs) have been determined using surface tension measurement. In case of SDBS, the CMC value increases with rise in temperature while in case of DTAB, it shows a U-type behavior, meaning thereby, both hydrophobic and hydrophilic dehydration becomes prominent in case of DTAB while only hydrophilic dehydration plays decisive role for the micellization to take place in case of SDBS. From surface tension data, the surface excess concentration at air/water interface ( max), minimum area per surfactant molecule (Amin) and the surface pressure at CMC (CMC) have been evaluated. Thermodynamic parameters of transfer, adsorption and micellization have also been evaluated and discussed in detail. Fluorescence probe study has been carried out to outline the results stated above. The CMC values calculated using pyrene as a fluorescent probe at room temperature resembles well with the micellar values determined using surface tension measurement.
The effect of temperature onthe micellization of an anionic surfactant in mixed solvent systems
2015
The micellization and thermodynamic properties of Sodium dodecyl sulphate (SDS) in ethylene glycol-water mixture has been studied at various mole fractions (X) of the solvent mixture and at different temperatures through conductivity measurements. The critical micelle concentration of SDS decreasedas the mole fraction of ethylene glycol (EG) increasedatconstant temperatureand increased with increasing temperature at constant mixture composition. Similarly, the degree of micelle ionization was inverselyproportional to mixture composition but directly proportional to temperature. Thesetrends are indicative of the interactions of SDS ionic head groups and the association of SDS molecules with the binary mixed solvents. The properties of the mixtures also indicate spontaneous formation of thermodynamically stable micelles.
Loading Preview
Sorry, preview is currently unavailable. You can download the paper by clicking the button above.