通过二氧化硅颗粒、聚合物和表面活性剂的核壳结构封装油和香料：实体概念
Encapsulation of oils and fragrances by core-in-shell structures from silica particles, polymers and surfactants: The brick-and-mortar concept
摘要：
胶体体提供了以核壳结构的形式将油性物质包封在水中的可能性。在这项研究中，我们从胶体颗粒中产生了具有壳的微胶囊，其中颗粒间开口被聚合物和表面活性剂的混合层堵塞，以防止货物分子的泄漏。颗粒和聚合物起到砖和砂浆的作用。我们使用亲水性二氧化硅颗粒，其通过吸附油酸钾而部分疏水化，以使其能够稳定皮克林乳液。测试了各种聚合物以选择最合适的一种。包封过程简单，包括超声单次均质化。所生产的胶囊是pH响应性的。它们在pH范围为3-6的水相中是稳定的，但在pH>6时，它们不稳定并且它们的货物被释放。通过优化二氧化硅颗粒、聚合物、油酸酯和NaCl的配方，我们能够包封各种油和香料，如十四烷、柠檬烯、水杨酸苄酯和香茅醇。所有这些在水中都具有有限的且不太高的溶解度。相反，用具有零水溶性（矿物油和硅油）或较高水溶性（苯氧乙醇和苯甲醇）的油没有获得稳定的微胶囊。通过对附加的界面张力和薄膜实验结果的分析，我们得出结论，获得稳定胶囊的关键因素是聚合物在油/水界面的不可逆吸附。通过表面活性剂吸附（而不是硅烷化）使颗粒疏水化对于所生产胶囊的pH响应性起着重要作用。
英文摘要：
Colloidosomes provide a possibility to encapsulate oily substances in water in the form of core-in-shell structures. In this study, we produced microcapsules with shell from colloidal particles, where the interparticle openings are blocked by mixed layers from polymer and surfactant that prevent the leakage of cargo molecules. The particles and polymer play the role of bricks and mortar. We used hydrophilic silica particles, which were partially hydrophobized by the adsorption of potassium oleate to enable them to stabilize Pickering emulsions. Various polymers were tested to select the most appropriate one. The procedure of encapsulation is simple and includes single homogenization by ultrasound. The produced capsules are pH responsive. They are stable in aqueous phase of pH in the range 3-6, but at pH>6 they are destabilized and their cargo is released. With the optimized formulation of silica particles, polymer, oleate and NaCl, we were able to encapsulate various oils and fragrances, such as tetradecane, limonene, benzyl salicylate and citronellol. All of them have a limited and not too high solubility in water. In contrast, no stable microcapsules were obtained with oils that either have zero water solubility (mineral and silicone oil) or higher water solubility (phenoxyethanol and benzyl alcohol). By analysis of results from additional interfacial-tension and thin-film experiments, we concluded that a key factor for obtaining stable capsules is the irreversible adsorption of the polymer at the oil/water interface. The hydrophobization of the particles by surfactant adsorption (instead of silanization) plays an important role for the pH responsiveness of the produced capsules.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
