Jiao Shouzheng, Cheng Peng, Li Qian, Wang Xiaonan, Li Yufen, Cheng Zhongjun, Lai Hua, Liu Yuyan
State Key Laboratory of Urban Water Resource & Environment, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China.
Institute of Radiation Technology, Beijing Academy of Science and Technology, Beijing 100875, China.
J Colloid Interface Sci. 2025 Jan;677(Pt B):303-311. doi: 10.1016/j.jcis.2024.08.041. Epub 2024 Aug 14.
Perfluorocarbon is commonly used as a coolant, chemical reaction carrier solvent, medical anti-hypoxic agents and blood substitutes. The realization of non-contact complex manipulation of perfluorocarbon liquids is urgently needed in human life and industrial production. However, most liquid-repellent interfaces are ineffective for the transport of ultra-low surface tension perfluorocarbon liquids, and struggle to maintain good durability due to unstable air or oil cushions in the surface. Therefore, preparing surfaces for stable non-contact complex manipulation of ultra-low surface tension droplets remains a challenge.
In this paper, a novel solution, a photothermal responsive droplet manipulation surface based on polydimethylsiloxane brushes, has been reported. On this surface, droplets with different surface tensions (as low as 10 mN/m) can be efficiently manipulated through induced near-infrared light. Notably, this surface maintains its effectiveness after exposure to extreme anthropogenic conditions.
The interface effect between perfluorocarbon droplets and polydimethylsiloxane brushes by near-infrared light-induced was investigated in detail. In addition, ultra-low surface tension droplets demonstrate the ability to transport solid particles. The conductive droplets exhibit sophisticated manipulation realizing the controlled switching of smart circuits. This research opens up new possibilities for advancing the capabilities and adaptability of ultralow surface tension droplets in a range of applications.
全氟化碳通常用作冷却剂、化学反应载体溶剂、医用抗缺氧剂和血液替代品。在人类生活和工业生产中，迫切需要实现对全氟化碳液体的非接触式复杂操控。然而，大多数拒液界面对于超低表面张力的全氟化碳液体的传输无效，并且由于表面不稳定的气垫或油垫而难以保持良好的耐久性。因此，制备用于稳定非接触式复杂操控超低表面张力液滴的表面仍然是一个挑战。
本文报道了一种新颖的解决方案，即基于聚二甲基硅氧烷刷的光热响应液滴操控表面。在该表面上，通过近红外光诱导可以有效地操控具有不同表面张力（低至10 mN/m）的液滴。值得注意的是，该表面在暴露于极端人为条件后仍能保持其有效性。
详细研究了近红外光诱导下全氟化碳液滴与聚二甲基硅氧烷刷之间的界面效应。此外，超低表面张力液滴表现出运输固体颗粒的能力。导电液滴展示了实现智能电路可控切换的复杂操控。这项研究为提升超低表面张力液滴在一系列应用中的性能和适应性开辟了新的可能性。
