Li Dan, Zhao Ying, Zhang Yunxiao, An Jinliang, Huang Jiaqiang, Yang Jinglei
Academy of Interdisciplinary Studies, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong 999077, China.
Department of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong 999077, China.
ACS Appl Mater Interfaces. 2024 Sep 11;16(36):48428-48437. doi: 10.1021/acsami.4c04926. Epub 2024 Sep 3.
The facile encapsulation of perfluoro liquids that are hydrophobic but not lipophilic into liposomes or microcapsules presents a significant challenge in the fields of biomedicine, dynamic optics, functional chemical applications, etc. This is due to their chemical inertness and physical immiscibility, particularly those with low boiling points. In this study, a novel strategy based on a double emulsion template via solvent evaporation is proposed after investigating the mechanism of three-phase emulsion systems. The perfluoro liquid droplets can be easily emulsified into a polymer solution as the second emulsion layer, where the polymer shell is formed during solvent evaporation in the continuum medium under proper processing controls. The morphology of particles is predictable and fits well with the linear model derived from Neumann's triangle in three-phase systems. Furthermore, a comprehensive study on the encapsulation of perfluoro ketone, which is widely used as a green fire extinguisher agent, is conducted as an example. The encapsulated perfluoro ketone showed instant thermal response upon heating while maintaining a good shelf life at room temperature. The remarkable fire suppression performance exhibited great potential for practical applications. This work offers more insight into the encapsulation of "naughty" perfluorinated chemicals and provides more possibilities for extended applications.
将疏水性但非亲脂性的全氟液体轻松封装到脂质体或微胶囊中，在生物医学、动态光学、功能化学应用等领域面临重大挑战。这是由于它们的化学惰性和物理不混溶性，特别是那些沸点低的全氟液体。在研究了三相乳液体系的机理后，本研究提出了一种基于双乳液模板通过溶剂蒸发的新策略。全氟液体滴可以很容易地乳化到聚合物溶液中作为第二乳液层，在适当的加工控制下，聚合物壳在连续介质中的溶剂蒸发过程中形成。颗粒的形态是可预测的，并且与三相体系中从诺伊曼三角形导出的线性模型非常吻合。此外，以广泛用作绿色灭火剂的全氟酮的封装为例进行了全面研究。封装的全氟酮在加热时表现出即时热响应，同时在室温下保持良好的保质期。其显著的灭火性能在实际应用中显示出巨大潜力。这项工作为“棘手”的全氟化学品的封装提供了更多见解，并为扩展应用提供了更多可能性。
