4.6 Article

Oil-in-water emulsions based on hydrophobic eutectic systems

Journal

PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 22, Issue 4, Pages 2181-2187

Publisher

ROYAL SOC CHEMISTRY
DOI: 10.1039/c9cp06762k

Keywords

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Funding

  1. ISPT Deep Eutectic Solvents in the pulp and paper industry consortium
  2. Bio-Based Industries Joint Undertaking under the European Union's Horizon 2020 research and innovation programme [668970]
  3. Netherlands Organisation for Scientific Research (NWO) [722.017.005]
  4. H2020 Societal Challenges Programme [668970] Funding Source: H2020 Societal Challenges Programme

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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.

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