Wu Zhang, Werner Jörg G, Weitz David A
John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, United States.
Department of Mechanical Engineering and Division of Materials Science and Engineering, Boston University, Boston, Massachusetts 02215, United States.
ACS Macro Lett. 2021 Jan 19;10(1):116-121. doi: 10.1021/acsmacrolett.0c00858. Epub 2020 Dec 28.
Microcapsules with liquid cores and solid shells are attractive as dispersible protective micron-sized containers. Applications that rely on molecular mass transport often require a combination of size selectivity, high permeability, and mechanical stability. Capsule architectures that combine all these features represent a material property, design, and fabrication challenge. In this work, the design of an asymmetric microcapsule shell architecture is reported to achieve a good combination of the desired features. Poly(methyl methacrylate) phase-inverted microcapsules featuring an asymmetric graded macroporous shell covered with a dense skin separation layer are obtained from water-in-oil-in-water double emulsion drops that are phase-inverted in a water-based coagulation bath. The phase-inverted microcapsules exhibit good mechanical stability and allow for high permeability of its shell membrane with molecular size dependence.
具有液芯和固体壳的微胶囊作为可分散的保护性微米级容器很有吸引力。依赖分子质量传输的应用通常需要尺寸选择性、高渗透性和机械稳定性的结合。结合所有这些特性的胶囊结构代表了材料性能、设计和制造方面的挑战。在这项工作中，报道了一种不对称微胶囊壳结构的设计，以实现所需特性的良好组合。具有不对称梯度大孔壳且覆盖有致密皮层分离层的聚（甲基丙烯酸甲酯）相转化微胶囊是由水包油包水型双乳液滴在水基凝固浴中相转化得到的。相转化微胶囊表现出良好的机械稳定性，并使其壳膜具有与分子大小相关的高渗透性。
