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Stabilization of Pickering Emulsions by Hairy Nanoparticles Bearing Polyanions

1
State Key Laboratory of Chemical Engineering, School of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China
2
College of Chemistry and Chemical Engineering, Shanghai University of Engineering Science, Shanghai 201620, China
*
Authors to whom correspondence should be addressed.
Polymers 2019, 11(5), 816; https://doi.org/10.3390/polym11050816
Received: 28 March 2019 / Revised: 13 April 2019 / Accepted: 28 April 2019 / Published: 7 May 2019
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Abstract

Pickering emulsions are increasingly applied in drug delivery, oil–water separation, composite materials preparation, and other fields. However, systematic studies on the stabilization of Pickering emulsions to satisfy the growing application demands in multiple fields with long-term conservation are rare. Compared to conventional solid nanoparticles, polyanion-modified hairy nanoparticles are more stable in practical environments and are investigated in this study. Poly (sodium p-styrenesulfonate) was grafted to a polystyrene (PS) core via a photoemulsion polymerization. A hairy nanoparticle bearing polyanions called poly (sodium p-styrenesulfonate) brush ([email protected]) was synthesized. The size and uniformity of the Pickering emulsions stabilized by [email protected] were investigated via a polarizing microscope. The stability of Pickering emulsions were optimized by adjusting critical factors like ultrasonic power and time, standing time, oil phases, salt concentration, and water:oil ratio. Results indicated that the Pickering emulsions could be stabilized by [email protected] nanoparticles, which showed remarkable and adjustable partial wetting properties. It was found that the optimized conditions were ultrasonic power of 150 W, ultrasonic time of 3 min, salt concentration of 0.1 mM, oil phase of hexadecane, and water:oil ratio of 1:1. The formation and stability of Pickering emulsion are closely related to the hairy poly (sodium p-styrenesulfonate) brush layer on the nanoparticle surface. View Full-Text
Keywords: hairy nanoparticles; pickering emulsion; photoemulsion polymerization hairy nanoparticles; pickering emulsion; photoemulsion polymerization
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Zhang, Y.; Chen, K.; Cao, L.; Li, K.; Wang, Q.; Fu, E.; Guo, X. Stabilization of Pickering Emulsions by Hairy Nanoparticles Bearing Polyanions. Polymers 2019, 11, 816.

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