Journal of the Korean Society of Manufacturing Process Engineers (한국기계가공학회지)

The Korean Society of Manufacturing Process Engineers (한국기계가공학회)
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Hydrophobic Surface Treatment with Anisotropic Characteristics Using Laser Selective Deposition

레이저 선택적 증착을 통한 이방특성의 소수성 표면처리

  • Kim, Ji-Hun (Department of Mechanical Engineering, Seoul National University of Science and Technology) ;
  • Kwon, Ye-Ji (Department of Mechanical Engineering, Seoul National University of Science and Technology) ;
  • Yang, Hoon-Seok (Department of Mechanical Engineering, Seoul National University of Science and Technology) ;
  • Kim, Joohan (Department of Mechanical Engineering, Seoul National University of Science and Technology)
  • 김지훈 (서울과학기술대학교 기계공학과) ;
  • 권예지 (서울과학기술대학교 기계공학과) ;
  • 양훈석 (서울과학기술대학교 기계공학과) ;
  • 김주한 (서울과학기술대학교 기계공학과)
  • Received : 2020.08.03
  • Accepted : 2020.08.29
  • Published : 2020.11.30
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Abstract

Surfaces with various roughnesses were produced through laser processing, and the anisotropy and hydrophobicity of the surfaces were examined in the context of the microstructures. The fine particles transferred to the glass surface exhibited different sizes, and the roughness increased. Due to the change in the roughness, the liquid could not penetrate the space between the fine particles, and it was thus exposed to the air. We analyzed this phenomenon using the combined Wenzel and Cassie-Baxter models. Excessive fine particle formation on the substrate tended to increase the roughness and surface energy. The silver-glass-air contact analysis could clarify the mechanism of the reduction of the contact angle and differences in the metastable and stable states when the particles did not completely cover the glass substrate. The formation of microstructures with fine particles through the laser selective deposition led to the generation of an anisotropic surface as the water droplets diffused toward the glass substrate with a relatively high surface energy level.

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References

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