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<p>The fabrication process of the liquid-infused surface (LIS) usually involves complicated surface modifications or is substrate-limited. In this study, a new LIS coating on various material surfaces is reported, in which a highly porous polytetrafluoroethylene (p-PTFE) film is initially deposited and followed by the lubricant infusing into the nanostructures. The LIS-coated glass slides present improved transparency compared to bare ones and low contact angle hysteresis with different droplets. The capability of p-PTFE film in lubricant retention is demonstrated, and the durability test of the LIS is conducted. Small droplets (5 µL) can slide easily in a stereoscopic LIS-coated resin channel, exhibiting the adaptation of LIS in coating on complex topography surfaces. By applying a metallic shadow mask during the p-PTFE film deposition, the substrate’s surface is thus selectively modified, presenting various hydrophobic-hydrophilic patterns. Lastly, this LIS is applied in a digital microfluidics (DMF) chip on the Parylene-C and Indium Tin Oxide (ITO) surface. By patterning the chip’s surface, the precision of the droplets’ separation is significantly improved, and single polystyrene bead isolation is realized.</p> Graphical Abstract <p></p>

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Area-selective patterning of a liquid-infused surface for droplet manipulation

  • 期刊论文

  • 发表日期：

    2026年1月7日

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  • Zhen Liu,
  • Rifei Chen,
  • Chunhui Wu,
  • Hongjun Liu,
  • Liqiu Wang,
  • Xing Cheng

摘要

The fabrication process of the liquid-infused surface (LIS) usually involves complicated surface modifications or is substrate-limited. In this study, a new LIS coating on various material surfaces is reported, in which a highly porous polytetrafluoroethylene (p-PTFE) film is initially deposited and followed by the lubricant infusing into the nanostructures. The LIS-coated glass slides present improved transparency compared to bare ones and low contact angle hysteresis with different droplets. The capability of p-PTFE film in lubricant retention is demonstrated, and the durability test of the LIS is conducted. Small droplets (5 µL) can slide easily in a stereoscopic LIS-coated resin channel, exhibiting the adaptation of LIS in coating on complex topography surfaces. By applying a metallic shadow mask during the p-PTFE film deposition, the substrate’s surface is thus selectively modified, presenting various hydrophobic-hydrophilic patterns. Lastly, this LIS is applied in a digital microfluidics (DMF) chip on the Parylene-C and Indium Tin Oxide (ITO) surface. By patterning the chip’s surface, the precision of the droplets’ separation is significantly improved, and single polystyrene bead isolation is realized.

Graphical Abstract