SANTOS GARCÍA, JENIFER, Calero, N. , Trujillo-Cayado, L. A. , Munoz, J.
Si
Colloid Surf. A-Physicochem. Eng. Asp.
Article
Científica
3.131
20/10/2018
000443153100040
Different ecological continuous phases were developed as a function of a green surfactant (Amidet N) and a fumed silica (Aerosil 200) concentration. The suitability of these systems was analysed by means of Small Amplitude Oscillatory Shear tests, flow curves, Cryo-SEM (Scanning Electron Microscopy) and the Multiple Light Scattering technique. An important rheological change in viscoelastic and flow properties was detected from 8 wt% to 9 wt% for binary systems of Aerosil/water. This rheological change was related to the interaction of Aerosil chains, which was reflected through the Cryo-SEM. As a consequence of the microstructure and, therefore, rheological properties, an increase in the physical stability of the more concentrated systems was observed. The addition of Amides N provoked an increase in viscoelastic properties related to the effective interaction between Aerosil chains. Finally, a stable lemongrass essential oil-in-water was developed. In this study, the role of Aerosil 200 as rheological modified and stabilizer has been studied. On top of that, the synergic rheological effect between this fumed silica and Amides N has been proved.
Aerosil 200; Fumed silica; Green surfactant; Sedimentation; Lemongrass essential oil; Continuous phase