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Visualization of Disruptive Bubble Behavior in Ultrasonic Fields

초음파장내 파괴적인 기포의 운동 가시화

  • 김태홍 (서울대학교 기계항공공학부) ;
  • 박근환 (서울대학교 기계항공공학부) ;
  • 김호영 (서울대학교 기계항공공학부)
  • Received : 2010.10.04
  • Accepted : 2011.03.12
  • Published : 2011.03.31

Abstract

The bubble oscillations play an important role in ultrasonic cleaning processes. In the ultrasonic cleaning of semiconductor wafers, the cleaning process often damages micro/nano scale patterns while removing contaminant particles. However, the understanding of how patterns in semiconductor wafers are damaged during ultrasonic cleaning is far from complete yet. Here, we report the observations of the motion of bubbles that induce solid wall damage under 26 kHz continuous ultrasonic waves. We classified the motions into the four types, i.e. volume motion, shape motion, splitting or jetting motion and chaotic motion. Our experimental results show that bubble oscillations get unstable and nonlinear as the ultrasonic amplitude increases, which may exert a large stress on a solid surface raising the possibility of damaging microstructures.

Acknowledgement

Supported by : (주)삼성전자, 서울대학교, 한국연구재단

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