Synergism and Interfacial Property Study of Sodium Lauryl Ether Sulfate and Polysorbate 80 at the Air–Water Interface

Abstract

Adsorption and micellization behavior of sodium lauryl ether sulfate (SLES) and Polysorbate 80 (PS80) was investigated using equilibrium and dynamic surface tension and foaming measurements. Critical micelle concentration (CMC) was determined using surface tension and dye (Sudan red III) solubilization method with the help of the Wilhelmy plate method and ultraviolet-visible spectroscopic method, respectively. The strength of the interaction for micellization and adsorption between the mixtures are calculated using the β interaction parameter. The SLES-PS80 mixture shows synergistic interaction with β = −8.0. The dynamic and foaming behavior at constant bulk concentration showed a higher t * value with lowest foaming at 50% mole fraction of SLES. The emulsification index (EI) of pure SLES, pure PS 80, and 1:1 SLES-PS 80 composition was studied using neem, karanja, and sunflower oils. Karanja and sunflower oils show a higher EI for mixture than the pure surfactants, whereas neem shows a lower EI for mixture than pure surfactants.

Formulation and Evaluation of Antifungal Shampoo Containing Modified Coconut Oil for Tinea Capitis Treatment

“…For example, the percent transmittance of mixture containing 30% w/w TLE was increased to 100% as increasing level of PSL to 40% w/w while that containing 70% w/w TLE need only 5% w/w to achieve clearness. The result suggested the ability of PSL to improve to solubility of MCO in surfactant mixtures due to reducing interfacial tension of primary surfactant [14]. Consequently, various ratios of TLE-PLS surfactant mixture that obtained clear solution, including 40:20, 40:30, 40:40, 50:20, 60:20, was selected for fabrication of MCO shampoo.…”