Effect of Adding Lecithin and Nonionic Surfactant on ?-Gels Based on a Cationic Surfactant-Fatty Alcohol Mixture

?-Gels are often used as base materials for cosmetics and hair conditioners. ?-Gel-based commercial products typically contain many types of additives, such polymers, electrolytes, oily components, other surfactants, in addition to the three basic components. However, few systematic studies have been conducted on effect additives ?-gels. In this study, we chose surfactant an example initiate structure rheological properties ?-gel samples formulated using cetyl alcohol (C16OH) cetyltrimethylammonium chloride (CTAC). Optical microscopy analysis demonstrated that size vesicles study was decreased via hydrogenated soybean lecithin (HSL) penta(oxyethylene) ether (C16EO5), a nonionic surfactant, them. Rheological measurements revealed at high C16OH/CTAC ratios, viscosity yield stress owing surfactants Conversely, low opposite tendency observed. Small-angle X-ray scattering indicated with HSL or C16EO5 them interlayer spacing their lamellar bilayer stack, which led changes samples.