Photo-responsive droplet manipulation slippery lubricant-infused porous surface with ultra-high durability  

作　　者：刘泽志 张琛 文通 李荟竹 高文萍 王新孔 赵伟 王凯歌 白晋涛 Ze-Zhi Liu;Chen Zhang;Tong Wen;Hui-Zhu Li;Wen-Ping Gao;Xin-Kong Wang;Wei Zhao;Kai-Ge Wang;Jin-Tao Bai(State Key Laboratory of Photon-Technology in Western China Energy,Xi’an 710069,China;International Collaborative Center on Photoelectric Technology and Nano Functional Materials,Xi’an 710069,China;Key Laboratory of Optoelectronics Technology in Shaanxi Province,Xi’an 710069,China;Institute of Photonics&Photon Technology,Northwest University,Xi’an 710069,China)

机构地区：[1]State Key Laboratory of Photon-Technology in Western China Energy,Xi’an 710069,China [2]International Collaborative Center on Photoelectric Technology and Nano Functional Materials,Xi’an 710069,China [3]Key Laboratory of Optoelectronics Technology in Shaanxi Province,Xi’an 710069,China [4]Institute of Photonics&Photon Technology,Northwest University,Xi’an 710069,China

出　　处：《Chinese Physics B》2023年第11期87-95,共9页中国物理B（英文版）

基　　金：Project supported by the National Major Scientific Research Instrument Development Project of China (Grant No. 51927804);the National Natural Science Foundation of China (Grant No. 62275216);the Science and Technology Innovation Team Project of Shaanxi Province (Grant Nos. S2018-ZC-TD-0061 and 2023-CX-TD-06)。

摘　　要：Photo-responsive slippery lubricant-infused porous surface(SLIPS) for droplet manipulation is flexible, noncontact and non-destructive in droplet manipulation, which has promising applications in flexible robotics, microfluidics,biomedicine, and chemical analysis. However, the repeated manipulations for droplets of SLIPSs are quite limited in the works reported so far, the poor durability of droplet manipulation severely limits the practical application of the surfaces. In this paper, an Fe3O4-doped polydimethylsiloxane(PDMS)-based SLIPS is proposed and implemented to achieve ultra-high repeated droplet manipulation numbers under near-infrared ray(NIR) laser irradiation. Firstly, a micron columnar array structure with micro-pits on the top side, as well as, a wall structure out of the array is designed on SLIPS to reserve the lubricant. Secondly, the prototype of the SLIPS is fabricated by a 3-step ultraviolet(UV) lithography, and subsequently immersed in silicone oil for more than 96 h to obtain the ultra-high durability slippery lubricant-infused porous surface(UD-SLIPS). With a power of 25 m W–85 m W NIR laser, the repeated manipulation of microdroplets(≤ 5 μL) in the scale of 1 cm can exceed more than 3000 times which is far beyond that in previous reports. Finally, the droplet manipulation performance of this photo-responsive UD-SLIPS and the influence of infusion time on durability are investigated. The mechanism of the PDMS swelling effect is found to be the key factor in improving the droplet manipulation durability of SLIPS. The findings of this work would be of great significance for the development of highly durable photo-responsive functional surfaces for droplet manipulation.

关 键 词：PHOTO-RESPONSIVE droplet manipulation slippery lubricant-infused porous surface(SLIPS) ultra-violet(UV)lithography 

分 类 号：O43[机械工程—光学工程]