화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Korean Chemical Engineering Research, Vol.57, No.2, 149-163, April, 2019
DOI10.9713/kcer.2019.57.2.149  Export Citation
입자 이동 제어를 위한 유전영동: 이론, 전극 구조 및 응용분야
Dielectrophoresis for Control of Particle Transport: Theory, Electrode Designs and Applications
이민지, 김지혜, 구형준†
  • 서울과학기술대학교 화공생명공학과, 01811 서울특별시 노원구 공릉로 232
Minji Lee, Ji-Hye Kim, and Hyung-Jun Koo†
  • Department of Chemical & Biomolecular Engineering, Seoul National University of Science & Technology, 232 Gongneung-ro, Nowon-gu, Seoul, 01811, Korea
E-mail:
초록
영구 또는 유도 쌍극자를 가지는 물질은 불균일한 전기장 하에서 전기장의 구배 방향을 따라 힘을 받게 되는데, 이 힘에 의한 물질의 이동을 유전영동(dielectrophoresis, DEP)이라 한다. DEP 힘의 크기와 방향은 입자와 매질의 유전율과 전도도, 그리고 가해지는 교류 전기장의 주파수에 의해 영향을 받게 되므로, 이러한 변수를 제어함으로써 입자의 이동을 정확하게 조작할 수 있다. 또한, 전기영동과는 달리 쌍극자가 유도되는 모든 입자에 적용이 가능하다는 장점이 있다. 이러한 DEP 기술은 미세 유체 공학은 물론 바이오 센서, 마이크로 칩 분야 등 다양한 분야에서 활용되고 있다. 본 논문은 먼저 DEP의 기본원리를 설명하고, DEP를 이용한 연구에서 주로 사용되는 대표적인 마이크로 전극의 구조에 대해 논의한다. 그리고, DEP의 대표적 응용분야인 입자의 분리 및 포집, 자기조립(self-assembly) 연구를 소개한다.
Under non-uniform electric field, a directional force along the electric field gradient is applied to matter having permanent or induced dipoles. The transport of particles by the directional force is called dielectrophoresis (DEP). Since the strength and direction of the DEP force depend on parameters, such as permittivity and conductivity of particles and surrounding media, and frequency of the applied AC electric field, particle can be precisely manipulated by controlling the parameters. Moreover, unlike electrophoresis, DEP can be applied to any particles where dipole is effectively induced by electric field. Such a DEP technique has been used in various fields, ranging from microfluidic engineering to biosensor and microchip research. This paper first describes the fundamentals of DEP, and discusses representative microelectrode designs used for DEP study. Then, exemplary applications of DEP, such as separation, capture and self-assembly of particles, are introduced.
Keywords:Dielectrophoresis;Electrode designs;Separation;Capture;Self-assembly
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