Issue 6, 2010
From the journal:

Lab on a Chip

3-dimensional electrodepatterning within a microfluidic channel using metal ion implantation

Jae-Woo Choi,*ab   Samuel Rosset,a   Muhamed Niklaus,a   James R. Adleman,b   Herbert Sheaa  and  Demetri Psaltisa  

* Corresponding authors

a School of Engineering, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
E-mail: jae-woo.choi@epfl.ch

b Department of Electrical Engineering, California Institute of Technology, Pasadena, CA, USA

Abstract

The application of electrical fields within a microfluidic channel enables many forms of manipulation necessary for lab-on-a-chip devices. Patterning electrodes inside the microfluidic channel generally requires multi-step optical lithography. Here, we utilize an ion-implantation process to pattern 3D electrodes within a fluidic channel made of polydimethylsiloxane (PDMS). Electrode structuring within the channel is achieved by ion implantation at a 40° angle with a metal shadow mask. The advantages of three-dimensional structuring of electrodes within a fluidic channel over traditional planar electrode designs are discussed. Two possible applications are presented: asymmetric particles can be aligned in any of the three axial dimensions with electro-orientation; colloidal focusing and concentration within a fluidic channel can be achieved through dielectrophoresis. Demonstrations are shown with E. coli, a rod shaped bacteria, and indicate the potential that ion-implanted microfluidic channels have for manipulations in the context of lab-on-a-chip devices.

Graphical abstract: 3-dimensional electrode patterning within a microfluidic channel using metal ion implantation

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Article information

DOI
https://doi.org/10.1039/B917719A
Article type
Paper
Submitted
28 Aug 2009
Accepted
03 Dec 2009
First published
07 Jan 2010

Lab Chip, 2010,10, 783-788

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3-dimensional electrode patterning within a microfluidic channel using metal ion implantation

J. Choi, S. Rosset, M. Niklaus, J. R. Adleman, H. Shea and D. Psaltis, Lab Chip, 2010, 10, 783 DOI: 10.1039/B917719A

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