Microencapsulation of Hydrophobic Liquids in Closed All-Silica Colloidosomes

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• 作者：Yongliang Zhao ; Yanqing Li ; Dan E. Demco ; Xiaomin Zhu ; Martin M枚ller
• 刊名：Langmuir
• 出版年：2014
• 出版时间：April 22, 2014
• 年：2014
• 卷：30
• 期：15
• 页码：4253-4261
• 全文大小：661K
• 年卷期：v.30,no.15(April 22, 2014)
• ISSN：1520-5827

文摘

A facile approach for the microencapsulation of hydrophobic liquids in closed solid all-silica colloidosomes is reported. The method is based on the formation of oil-in-water emulsions stabilized by silica nanoparticles and subsequent gluing of the particles at the water/oil interface by a silica precursor polymer鈥攈yperbranched polyethoxysiloxane. By this means different oils are successfully enclosed in hence formed all-silica colloidosomes with almost 100% efficiency. Via a systematical study it is demonstrated that this process is a delicate interplay between the emulsion stability, oil polarity, and sol鈥揼el reaction kinetics. This approach allows fabricating microcapsules of hydrophobic liquid substances in a mechanically stable, chemically inert, and biocompatible matrix, silica, with high encapsulation capacity and a controlled release profile.