Vasantha, V. A.; Ng, Q. H.; Rusli, W.; Hadia, N. J.; Stubbs, L. P., Unique oil-in-brine pickering emulsion using responsive antipolyelectrolyte functionalized latex : a versatile emulsion stabilizer. ACS Applied Materials & Interfaces 2020, 12 (20), 23443-23452.
Abstract:
A simple and straightforward approach to synthesize oil-in-water (O/W) emulsions under high salinity and temperature using zwitterion-functionalized latexes are presented in this work. First, well-defined functionalized latexes were synthesized by emulsifier-free emulsion copolymerization in the presence of precursor sulfobetaine comonomer using brine as a continuous phase. The surface-functionalized latex particles were then characterized by DLS, SEM, TEM, XPS, and TGA. The functionalized latex exhibited antipolyelectrolyte behavior in high salinity brine and at high temperatures. The effects of salinity, temperature, and pH on the long-term stability of the particles were investigated. Further, to evaluate the potential in high salinity brine and high temperature, the saltphilic functionalized latexes were utilized to stabilize the oil/brine (O/W) interface without any other additives. The latex enabled the formation of a stable Pickering emulsion system with low solid content (
License type:
PublisherCopyrights
Funding Info:
This work was supported by the Industry Alignment Fund - Pre-Positioning Programme (IAF-PP) of Agency for Science, Technology and Research (A*STAR) (A18B4a0094).