1 research outputs found
CO<sub>2</sub>‑Controllable Foaming and Emulsification Properties of the Stearic Acid Soap Systems
Fatty
acids, as a typical example of stearic acid, are a kind of
cheap surfactant and have important applications. The challenging
problem of industrial applications is their solubility. Herein, three
organic aminesî—¸ethanolamine (EA), diethanolamine (DEA), and
triethanolamine (TEA)î—¸were used as counterions to increase
the solubility of stearic acid, and the phase behaviors were investigated
systematically. The phase diagrams were delineated at 25 and 50 °C,
respectively. The phase-transition temperature was measured by differential
scanning calorimetry (DSC) measurements, and the microstructures were
vesicles and planar sheets observed by cryogenic transmission electron
microscopy (cryo-TEM) observations. The apparent viscosity of the
samples was determined by rheological characterizations. The values, <i>r</i><sub>cmc</sub>, for the three systems were less than 30
mN·m<sup>–1</sup>. Typical samples of bilayers used as
foaming agents and emulsifiers were investigated for the foaming and
emulsification assays. CO<sub>2</sub> was introduced to change the
solubility of stearic acid, inducing the transition of their surface
activity and further achieving the goal of defoaming and demulsification