Oil-in-oil pickering emulsions stabilized by diblock copolymer nanoparticles

Abstract

Hypothesis

Diblock copolymer nanoparticles have been shown to be Pickering emulsifiers for both oil-in-water and water-in-oil emulsions. Recently, we reported the preparation of sterically-stabilized diblock copolymer spheres in a low-viscosity silicone oil (Macromolecules 53 (2020) 1785–1794). We hypothesized that such spheres could be used as a Pickering emulsifier for a range of oil-in-oil emulsions comprising droplets of a bio-sourced oil dispersed in silicone oil.

Experiments

Diblock copolymer spheres were prepared via reversible addition-fragmentation chain transfer (RAFT) dispersion polymerization of benzyl methacrylate in silicone oil and characterized by dynamic light scattering and transmission electron microscopy. These spheres were evaluated as Pickering emulsifiers for a series of oil-in-oil Pickering emulsions. The influence of both sphere size and core-forming block composition was investigated.

Findings

Optimization of the nanoparticle size and core-forming block composition enabled stable bio-sourced oil-in-silicone emulsions to be obtained for nine out of the ten bio-sourced oils investigated. These emulsions were characterized in terms of their mean droplet size by optical microscopy.

Metadata

Item Type:	Article
Authors/Creators:	Rymaruk, M.J. Cunningham, V.J. Brown, S.L. Williams, C.N. Armes, S.P. https://orcid.org/0000-0002-8289-6351
Copyright, Publisher and Additional Information:	© 2020 Elsevier. This is an author produced version of a paper subsequently published in Journal of Colloid and Interface Science. Uploaded in accordance with the publisher's self-archiving policy. Article available under the terms of the CC-BY-NC-ND licence (https://creativecommons.org/licenses/by-nc-nd/4.0/).
Keywords:	Pickering emulsions; Nanoparticles; Block copolymers; Self-assembly
Dates:	Published: 15 November 2020 Published (online): 9 July 2020 Accepted: 3 July 2020
Institution:	The University of Sheffield
Academic Units:	The University of Sheffield > Faculty of Science (Sheffield) > Department of Chemistry (Sheffield)
Funding Information:	Funder Grant number Engineering and Physical Science Research Council EP/R003009/1; EP/L016281/1
Depositing User:	Symplectic Sheffield
Date Deposited:	30 Jul 2020 13:09
Last Modified:	09 Jul 2021 00:38
Status:	Published
Publisher:	Elsevier
Refereed:	Yes
Identification Number:	10.1016/j.jcis.2020.07.010
Related URLs:	Author
Open Archives Initiative ID (OAI ID):	oai:eprints.whiterose.ac.uk:163861

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Oil-in-oil pickering emulsions stabilized by diblock copolymer nanoparticles

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