Stabilization of Pickering Emulsions with Oppositely Charged Latex Particles: Influence of Various Parameters and Particle Arrangement around Droplets

Nallamilli, Trivikram; Binks, Bernard P.; Mani, Ethayaraja; Basavaraj, Madivala G.

Abstract

© 2015 American Chemical Society. In this study we explore the fundamental aspects of Pickering emulsions stabilized by oppositely charged particles. Using oppositely charged latex particles as a model system, Pickering emulsions with good long-term stability can be obtained without the need for any electrolyte. The effects of parameters like oil to water ratio, mixed particle composition, and pH on emulsion type and stability are explored and linked to the behavior of the aqueous particle dispersion prior to emulsification. The particle composition is found to affect the formation of emulsions, viz., stable emulsions were obtained close to a particle number ratio of 1:1, and no emulsion was formed with either positively or negatively charged particles alone. The emulsions in particle mixtures exhibited phase inversion from oil-in-water to water-in-oil beyond an oil volume fraction of 0.8. Morphological features of emulsion droplets in terms of particle arrangement on the droplets are discussed.

Citation

Nallamilli, T., Binks, B. P., Mani, E., & Basavaraj, M. G. (2015). Stabilization of Pickering Emulsions with Oppositely Charged Latex Particles: Influence of Various Parameters and Particle Arrangement around Droplets. Langmuir : the ACS journal of surfaces and colloids, 31(41), 11200-11208. https://doi.org/10.1021/acs.langmuir.5b02443

• Journal Article Type: Article
• Acceptance Date: Jul 2, 2015
• Online Publication Date: Sep 27, 2015
• Publication Date: Oct 20, 2015
• Deposit Date: Oct 29, 2015
• Publicly Available Date: Nov 23, 2017
• Journal: Langmuir
• Print ISSN: 0743-7463
• Electronic ISSN: 1520-5827
• Publisher: American Chemical Society
• Peer Reviewed: Peer Reviewed
• Volume: 31
• Issue: 41
• Pages: 11200-11208
• DOI: https://doi.org/10.1021/acs.langmuir.5b02443
• Keywords: Pickering emulsion; Oppositely charged particles; Heteroaggregation; Limited coalescence; Zeta potential
• Public URL: https://hull-repository.worktribe.com/output/380549
• Publisher URL: http://pubs.acs.org/doi/10.1021/acs.langmuir.5b02443
• Additional Information: This document is the Accepted Manuscript version of a Published Work that appeared in final form in Langmuir, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see http://dx.doi.org/10.1021/acs.langmuir.5b02443 .