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Oil-in-water emulsions based on hydrophobic eutectic systems

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Abstract

We demonstrate that oil-in-water emulsions can be prepared from hydrophobic eutectic systems (ES). Light microscopy and dynamic light scattering show that droplets are formed and zeta potential measurements indicate sufficient stability against coalescence. We investigate whether Ostwald ripening occurs in these ES-in-water emulsions by following the droplet growth over time and comparing it with an emulsion comprising decane in water. At first sight, the Ostwald ripening rate of the ES-in-water emulsion is expected to be orders of magnitude larger than the ripening of the decane-in-water emulsion due to a much higher solubility of the dispersed phase. However, experimentally we find that the ES-in-water emulsion actually grows a factor of two slower than the decane-in-water emulsion. We attribute this to the two-component nature of the ES, since the growth rate is mainly set by the least-soluble component of the ES. Thus, ESs offer the advantage of creating liquid emulsions of solid components, while setting the emulsion stability through their composition.

Graphical abstract: Oil-in-water emulsions based on hydrophobic eutectic systems

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Supplementary files

Article information


Submitted
16 Dec 2019
Accepted
21 Dec 2019
First published
08 Jan 2020

This article is Open Access

Phys. Chem. Chem. Phys., 2020, Advance Article
Article type
Paper

Oil-in-water emulsions based on hydrophobic eutectic systems

D. J. G. P. van Osch, J. van Spronsen, A. C. C. Esteves, R. Tuinier and M. Vis, Phys. Chem. Chem. Phys., 2020, Advance Article , DOI: 10.1039/C9CP06762K

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