Journal of the Korean Society for Precision Engineering (한국정밀공학회지)

Korean Society for Precision Engineering (한국정밀공학회)
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Movement of Liquid Metal Droplet in Channel by Continuous Electrowetting Effect

연속적 전기습윤 효과를 이용한 액체금속 액적의 채널 내 거동

  • Baek, Seungbum (Department of Mechanical Engineering, Pohang University of Science and Technology) ;
  • Won, Dong-Joon (Department of Mechanical Engineering, Pohang University of Science and Technology) ;
  • Kim, Hojin (Department of Mechanical Engineering, Pohang University of Science and Technology) ;
  • Kim, Joonwon (Department of Mechanical Engineering, Pohang University of Science and Technology)
  • 백승범 (포항공과대학교 기계공학과) ;
  • 원동준 (포항공과대학교 기계공학과) ;
  • 김호진 (포항공과대학교 기계공학과) ;
  • 김준원 (포항공과대학교 기계공학과)
  • Received : 2015.09.09
  • Accepted : 2015.11.13
  • Published : 2016.03.01
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Abstract

In this paper, the movement of a liquid metal droplet in a channel by continuous electrowetting effect is analyzed. The channel is fabricated using two glass substrates and silicone rubber as spacers, and a mercury droplet and dilute sulfuric acid are added into the channel. The droplet is moved according to voltage applied at both ends of the channel through an electrolyte. According to the shape of the droplet and the applied voltage, the velocity of the droplet is changed. The velocity is proportional to the applied voltage and inversely proportional to the length of the droplet, both theoretically and experimentally. Contact angle hysteresis and a meniscus change were also found in the moving state. This implies the existence of a threshold in movement by Laplace pressure difference. The experiment indicated that the sliding angle was inversely proportional to the width of the droplet but that the voltage threshold was proportional to the width.

Keywords

References

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