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A Method to Manipulate Surface Tension of a Liquid Metal via Surface Oxidation and Reduction
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Electrodeposited surfaces with reversibly switching interfacial properties.

Yue Liu1, Liyan Zhao1, Jianjian Lin2

  • 1Institute for Composites Science Innovation, School of Materials Science and Engineering, Zhejiang University, Hangzhou, Zhejiang 310027, China.

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Researchers developed a novel electrochemical method to create metallic porous surfaces with switchable wettability and liquid repellency. These surfaces can be functionalized with lubricants for advanced applications like water harvesting and smart liquid gates.

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Area of Science:

  • Materials Science
  • Surface Chemistry
  • Nanotechnology

Background:

  • Engineered surfaces with switchable interfacial properties like wettability are crucial for advanced applications but remain scarce.
  • Developing robust and easily fabricated surfaces with tunable liquid-repellent characteristics is a significant challenge.

Purpose of the Study:

  • To develop a general and simple method for creating metallic porous surfaces with powerful, reversible wettability switching capabilities.
  • To explore the potential of these surfaces in diverse applications requiring controlled liquid interactions.

Main Methods:

  • A one-step electrochemical deposition process was employed to fabricate metallic porous membranes.
  • The switching mechanism relies on the controlled orientation of dodecyl sulfate ions within the porous structure.
  • Lubricants were infused into the porous membranes to create liquid-infused surfaces with tunable properties.

Main Results:

  • The fabricated surfaces exhibited exceptional wettability switching and liquid-repellent properties.
  • Adjustable wettability allowed for the on-demand trapping of various lubricants, creating versatile liquid-infused surfaces.
  • Demonstrated applications include encryption, controllable droplet transfer, and efficient water harvesting.

Conclusions:

  • The electrochemical deposition method offers a facile route to advanced functional surfaces with switchable properties.
  • The developed liquid-infused porous membranes show significant promise for applications in smart materials, microfluidics, and environmental technologies.
  • A silver porous membrane coating on copper mesh created a smart antifouling liquid gate with selective water or oil passage.