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When a paint brush is immersed in water, the bristles wave freely inside the water. When it is taken out, the bristles stick together. The reason behind this effect is surface tension.
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Selective Area Modification of Silicon Surface Wettability by Pulsed UV Laser Irradiation in Liquid Environment
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Wettability Controlled Surface for Energy Conversion.

Weiwei Zhao1, Ye Jiang1,2, Wenjie Yu1,2

  • 1Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, 1219 Zhongguan West Road, Zhenhai District, Ningbo, 315201, P. R. China.

Small (Weinheim an Der Bergstrasse, Germany)
|July 6, 2022
PubMed
Summary
This summary is machine-generated.

Researchers developed laser-scribed graphene surfaces with tunable wettability for efficient energy conversion. These patterned surfaces enable liquid transport and selective cooling, showcasing potential for advanced renewable energy applications.

Keywords:
energy conversiongraphenelaser scribingpatternswettability

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Area of Science:

  • Materials Science
  • Surface Engineering
  • Renewable Energy

Background:

  • Functional surfaces with controllable wettability are crucial for efficient renewable energy utilization.
  • Developing patterned surfaces for energy conversion is a key research area.

Purpose of the Study:

  • To demonstrate a laser scribing strategy for fabricating patterned graphene surfaces.
  • To engineer surfaces with controllable and patternable wettability for energy conversion applications.

Main Methods:

  • Fabrication of patterned graphene surfaces on a polybenzoxazine substrate using laser raster-scanning and vector-scanning modes.
  • Construction of superhydrophilic (LSHL) and superhydrophobic (LSHB) surfaces with unique hierarchical structures.
  • Design of wettability patterns for spatially resolved LSHL and LSHB regions.

Main Results:

  • Achieved conversion of surface energy to liquid kinetic energy.
  • Demonstrated directional, pumpless water transport via capillary pressure gradient.
  • Enabled selective surface cooling through jet impingement.
  • LSHB surfaces showed high electric-to-thermal (222 °C cm² W⁻¹) and light-to-thermal (88%) energy conversion efficiencies.

Conclusions:

  • The laser scribing method provides a flexible approach to fabricate graphene surfaces with controlled wettability.
  • These surfaces offer promising applications in efficient energy utilization and conversion.
  • The developed material system and processing method represent a step forward in fabricating advanced functional surfaces.