Frozen Cyclohexane-in-Water Emulsion as a Sacrificial Template for the Synthesis of Multilayered Polyelectrolyte Microcapsules

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• 作者：Sachin Khapli ; Jin Ryoun Kim ; Jin Kim Montclare ; Rastislav Levicky ; Maurizio Porfiri ; Stavroula Sofou
• 刊名：Langmuir
• 出版年：2009
• 出版时间：September 1, 2009
• 年：2009
• 卷：25
• 期：17
• 页码：9728-9733
• 全文大小：765K
• 年卷期：v.25,no.17(September 1, 2009)
• ISSN：1520-5827

文摘

This paper reports the application of frozen cyclohexane-in-water emulsions as sacrificial templates for the fabrication of hollow microcapsules through layer-by-layer assembly of polyelectrolytes, poly(styrenesulfonate sodium salt), and poly(allylamine hydrochloride). Extraction of the cyclohexane phase from frozen emulsions stabilized with 11 polyelectrolyte layers by compatibilization with 30% v/v ethanol leads to the formation of water-filled microcapsules while preserving the spherical geometry. The majority of microcapsules (>90%) are prepared with intact polyelectrolyte membranes as measured by their deformation induced by osmotic pressure. This work provides a new route for the synthesis of hollow multilayered microcapsules under mild operating conditions.