Phase behaviours of amino-acid based anionic surfactants

ABSTRACT

The phase behaviours of three types of amino-acid based surfactants were explored. They are Sodium Cocoyl Glutamate [commercially known as Amisoft CS-11], Sodium Lauroyl Glutamate [commercially known as Amisoft LS-11] and Sodium Cocoyl Glycinate [commercially known as Amilite GCS-11]. The optical polarized microscope was used to observe the liquid crystalline phases and to capture images. The existence of liquid crystalline phases was further investigated by small angle X-ray scattering. The phase diagrams were investigated as a function of surfactant concentration and as a function of temperature as well. The rheological behaviours of liquid crystalline phase were also investigated. All surfactants were found to form two-phase region, micellar region at low concentration while liquid crystalline phases were found to form at high concentration