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

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.