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Janus Membrane for Water/Bubble Unidirectional Penetration Based on Nanosecond Laser Processing.

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Researchers developed a novel Janus membrane using laser drilling for tunable water and bubble transport. This innovation shows promise for sustainable water management and energy applications.

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Area of Science:

  • Materials Science
  • Surface Chemistry
  • Nanotechnology

Background:

  • Janus membranes with asymmetric wettability enable unidirectional transport of fluids and particles.
  • These membranes are crucial for applications in sustainable water management, energy conversion, and biomedical devices.
  • Developing efficient and tunable Janus membranes remains an active area of research.

Purpose of the Study:

  • To fabricate a novel Janus wettable membrane using a simple nanosecond laser drilling and texturing method.
  • To investigate the tunable penetration rate of water droplets and underwater bubbles through the fabricated membrane.
  • To analyze the mechanism of unidirectional penetration and flow rate differences in the Janus membrane.

Main Methods:

  • Fabrication of Janus membranes via nanosecond laser drilling and texturing.
  • Tuning membrane properties by adjusting drilling pore size and porosity.
  • Analysis of water droplet and underwater bubble penetration rates.
  • Investigation of the unidirectional transport mechanism and flow rate differences.

Main Results:

  • A novel Janus wettable membrane was successfully fabricated using laser-based techniques.
  • The membrane exhibited tunable penetration rates for both water droplets and underwater bubbles.
  • An approximately linear correlation was found between the optimal penetration rate and the ratio of pore size and porosity.
  • Effective fog harvesting and selective water-bubble collection were demonstrated.

Conclusions:

  • Laser precision and adaptive structural design enable the creation of advanced Janus membranes.
  • The developed Janus membrane offers tunable transport properties for diverse applications.
  • This work paves the way for next-generation Janus membranes with significant industrial and environmental impact.