Switchable Pickering Emulsions Stabilized by Silica Nanoparticles Hydrophobized In Situ with a Switchable Surfactant

Abstract

Back and forth: The CO2 /N2 trigger of a switchable surfactant (neutral amidine/cationic amidinium) was transferred to mineral nanoparticles through in situ hydrophobization in water. Switchable oil-in-water Pickering emulsions that entail a CO2 /N2 trigger were obtained by using negatively charged silica nanoparticles and a trace amount of the switchable surfactant as the stabilizer.

CO2-Controllable Foaming and Emulsification Properties of the Stearic Acid Soap Systems

“…16 CO 2 has been reported as a smart gas to control the transition in the literature. 18,19 The main problem of using fatty acids is their insolubility in aqueous solution. Common alkalis such as NaOH and KOH usually dissolve fatty acids at high temperature with a high Krafft point.…”

Novel and Environmentally Friendly Oil Spill Dispersant Based on the Synergy of Biopolymer Xanthan Gum and Silica Nanoparticles

“…13 The potential applications of Pickering emulsion include drug delivery, oil recovery, food, material fabrication, and personal products. 14−16 Various solid particles have been employed for preparing Pickering emulsion, such as silica, 17 iron oxide, 18 clay, 19 polystyrene, 20 chitin nanocrystals, 21 and carbon black. 22 In addition, one of the exciting features of Pickering emulsion is that they are highly stable to coalescence even when the oil droplets are large.…”

Antagonistic effect in pickering emulsion stabilized by mixtures of hydroxyapatite nanoparticles and sodium oleate

“…1 Because of the strong steric repulsion of particle layers at the interface, solid-stabilized emulsions ( , porous materials 4 , core shell materials 5 , nanocomposites 6,7 , and colloidosomes 8-10 and designing smart emulsion systems 11,12 .…”

“…So usually modification of particles is necessary. Generally, in situ surface modification with surfactant is used as a preferable alternative considering its simplicity and low cost 12 .Thus, the understanding of the behavior of emulsion stabilized by mixture of inorganic particles and surfactant is crucial.…”