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Programmable Liquid Adhesion on Bio-Inspired Re-Entrant Structures.

Xiaojiang Liu1, Hongcheng Gu1, Haibo Ding1

  • 1State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing, 210096, China.

Small (Weinheim an Der Bergstrasse, Germany)
|July 16, 2019
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Summary
This summary is machine-generated.

Researchers developed 3D-printed micro doubly re-entrant arrays to control liquid droplet adhesion. These surfaces enable programmable adhesion behaviors, from no residue to absolute adhesion, for diverse liquid manipulation applications.

Keywords:
droplet manipulationmicropatternsprogrammable liquid adhesionre-entrant structuressuperrepellent

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Area of Science:

  • Materials Science
  • Surface Science
  • Nanotechnology

Background:

  • Traditional methods for creating surfaces with antispreading and high adhesion properties are often multi-step, require chemical modification, and are ineffective for low surface energy liquids.
  • Multiply re-entrant structures offer universal, modification-independent antiadhesion properties, but their liquid adhesion behavior and applications are not well-understood.

Purpose of the Study:

  • To demonstrate programmable liquid adhesion on 3D-printed micro doubly re-entrant arrays.
  • To explore the tunable adhesion behaviors of these structures for liquid manipulation.
  • To investigate applications in droplet transport, enrichment, and micropatterning.

Main Methods:

  • Fabrication of micro doubly re-entrant arrays using 3D printing.
  • Investigation of liquid adhesion behaviors based on array arrangement.
  • Design of various arrays to tune macro/micro liquid droplet manipulation.

Main Results:

  • Achieved programmable liquid adhesion by arranging micro doubly re-entrant arrays.
  • Demonstrated three distinct Cassie adhesion behaviors: no residue adhesion, tunable adhesion, and absolute adhesion.
  • Successfully tuned macro/micro liquid droplet manipulation for various applications.

Conclusions:

  • 3D-printed micro doubly re-entrant arrays provide a versatile platform for controlling liquid adhesion.
  • Programmable adhesion enables precise manipulation of liquid droplets, with potential in microfluidics and surface engineering.
  • This approach overcomes limitations of traditional methods, offering a pathway for advanced liquid handling technologies.