CO₂-responsive surfactants for switchable Pickering emulsions with a recyclable aqueous phase

Abstract

Residual of surfactants in oil phase after demulsification may cause several problems, such as self-emulsification of the oil and contamination of oil-soluble products. Due to the amphipathic properties of surfactants,...

CO2-Switchable colloids

“…Alumina, like silica, is negatively charged and by itself is too hydrophilic to act as a Pickering stabilizer. Li et al 73 used a CO 2 -switchable surfactant containing a carboxylate group, ((11-( N , N -dimethylamino)) sodium undecanoate, NCOONa), together with alumina nanoparticles to form a Pickering stabilizer. In the absence of CO 2 , the surfactant is anionic and amphiphilic.…”

CO2 Switchable Pickering Emulsion Stabilized by Responsive Janus SiO2 Nanoparticles for Enhanced Oil Recovery

“…It is anticipated that the emulsion will have controllable stability . For these purposes, stimuli-responsive and switchable Pickering emulsions have been demonstrated advantages due to their ability to undergo emulsification and demulsification in a controlled manner, triggered by various stimuli such as pH, magnetic fields, light, temperature, CO 2 /N 2 , etc. − …”

“…In light of the safety, nontoxicity, recyclability, stability, and rapid stimulus-responsive behavior of the materials, the prepared W/O Pickering emulsions are expected to provide new insights into the further development of enhanced oil recovery, such as the enhanced oil recovery agents, the delivery of crude and oilfield produced fluid treatment. 30…”

“…Moreover, SiO 2 nanoparticles exhibit a green and environmentally friendly nature; as well as being economical and readily accessible, the modified Janus nanoparticles can also be recycled in the aqueous phase following stimulation response. In light of the safety, nontoxicity, recyclability, stability, and rapid stimulus-responsive behavior of the materials, the prepared W/O Pickering emulsions are expected to provide new insights into the further development of enhanced oil recovery, such as the enhanced oil recovery agents, the delivery of crude and oilfield produced fluid treatment …”

Pickering Emulsions and Viscoelastic Solutions Constructed by a Rosin-Based CO2-Responsive Surfactant

“…Yu reported a CO 2 /N 2 responsive Pickering emulsion that provided a microenvironment for enzymatic hydrolysis reactions and could recover particles and enzymes from the water phase by bubbling N 2 to demulsifier the emulsion. Li reported a CO 2 -convertible surfactant co-stabilized a CO 2 -convertible Pickering emulsion with trace amounts of alumina nanoparticles.…”