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.

中文翻译：

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基于疏水共晶体系的水包油乳液。

我们证明，可以从疏水共晶体系（ES）制备水包油乳液。光学显微镜和动态光散射表明形成了液滴，并且ζ电势测量表明对聚结具有足够的稳定性。我们通过追踪液滴随时间的增长并将其与水中包含癸烷的乳液进行比较，研究了这些水包水ES乳液中是否发生了奥斯特瓦尔德熟化。乍看之下，由于分散相的溶解度高得多，预计ES水包乳剂的Ostwald成熟速率比水癸烷乳液的成熟速率大几个数量级。但是，从实验上我们发现，水包ES乳液的生长速度实际上比水癸烷乳液的增长慢两倍。我们将此归因于ES的两部分性质，因为增长率主要由ES的最不溶成分决定。因此，ES提供了产生固体组分的液体乳液的优点，同时通过其组成来设定乳液稳定性。