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Drop Impact on Submillimeter-Structured Surfaces with Different Wetting Behaviors.

Jiangen WuJun ZouHaojun MaJiayan WangChunbo LiCan YangLeimin DengMeng WangHuan Yang
Published in: Langmuir : the ACS journal of surfaces and colloids (2023)
Droplet impact behaviors are crucial in controlling infectious diseases, inkjet printing, and anti-icing applications. The wettability and microstructure of the material surface are critical factors in this regard. Compared to microstructures, submillimeter structures are more damage-resistant, thereby ensuring droplet impact behaviors' stability. Herein, submillimeter-structured PDMS surfaces with varying wetting properties were prepared to investigate droplet impact behaviors. Experimental results indicate that submillimeter-structured surfaces are more prone to droplet splashing than flat surfaces, which can be suppressed by increasing surface hydrophilicity. An increase in the submillimeter pillar height and a decrease in spacing result in an increased critical Weber number. Additionally, the capillary forces of the superhydrophilic surface lead to droplet impact, accompanied by deposition. This study supports the long-term stable use of the droplet impact effect to achieve fluid separation.
Keyphrases
  • high throughput
  • single cell
  • escherichia coli
  • infectious diseases
  • body mass index
  • biofilm formation
  • staphylococcus aureus
  • high resolution
  • physical activity
  • cystic fibrosis