Fragrance emulsions are used in many applications in daily life. Since a lot of fragrances are quite volatile substances, their release rate from emulsions is a crucial factor. Since in most cases a mixture of fragrances is applied, the olfactory impression might change over time if the release rates of individual components differ significantly. For such applications, encapsulation with barrier materials is sought to retard release in an unselective manner. Stable fragrance-in-water emulsions were made by applying a synthetic hectorite as Pickering emulsifier which was fixed as a multilayer stack at the oil–water interface by adding poly(ethylene imine). The release of different fragrance molecules (eucalyptol, limonene, α-pinene, and ethyl-2-methylbutyrate) from these emulsions was studied as the ratio between hectorite and poly(ethylene imine) was varied. While the release rates of all fragrances were retarded by the hybrid capsule acting as a nonselective barrier, the relative release was determined by the solubility of individual fragrances in the capsule material. Fragrance release could be further reduced by additional chemical cross-linking of poly(ethylene imine).

中文翻译：

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层状合成锂蒙脱石在水性乳液中的香气包封。

香精乳液在日常生活中有许多用途。由于许多香料是非常易挥发的物质，因此它们从乳液中的释放速度是至关重要的因素。由于在大多数情况下使用的是芳香剂混合物，因此如果各个成分的释放速率明显不同，则嗅觉可能会随时间而变化。对于这样的应用，寻求用阻挡材料包封以非选择性方式延迟释放。通过使用合成的锂蒙脱石作为Pickering乳化剂来制备稳定的水包香乳剂，并通过添加聚乙烯亚胺将其固定为油水界面的多层堆栈。释放出不同的香气分子（桉油精，柠檬烯，α-pine烯，改变锂蒙脱石与聚（亚乙基亚胺）之比，研究了由这些乳剂制得的（2-甲基丁酸乙酯和2-甲基丁酸乙酯）。尽管所有香精的释放速率都受到杂化胶囊作为非选择性屏障的阻碍，但相对释放却取决于单个香精在胶囊材料中的溶解度。聚（乙烯亚胺）的其他化学交联可进一步减少香味的释放。