Salt-Resistant Switchable Pickering Emulsions Stabilized by Mesoporous Nanosilica Hydrophobized In Situ by pH-Insensitive Surfactants
Danhua Xie, Yulong Jiang, Yunjin Zhang, Binglei Song
Abstract
= 1), stable PEs re-formed after homogenization. These emulsions remained stable for over 30 days after 60 cycles, switching from stable to unstable and back to stable states, and showed a high salt tolerance. A mechanism for the switching of the Pickering emulsion (PE) to unstable and back to stable states was derived and involved anionic and neutral forms of hydroxyl groups at the mesopores of the mesoporous silica nanoparticles (MSNPs). This work reveals a switchable PE system involving a pH-insensitive surfactant, in which the species of oils and cationic surfactants can be arbitrarily selected, a feature that greatly expands the applicability of PEs.
Topics & Concepts
Cationic polymerizationPickering emulsionPulmonary surfactantMesoporous materialChemical engineeringEmulsionSalt (chemistry)ChemistryMaterials scienceStabilizer (aeronautics)Mesoporous silicaPolymer chemistryOrganic chemistryCatalysisMechanical engineeringEngineeringPickering emulsions and particle stabilizationProteins in Food SystemsSurfactants and Colloidal Systems