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In-plane alloy electrodes for capacitively coupled contactless conductivity detection in poly(methylmethacrylate) electrophoretic chips

Citation

Gaudry, AJ and Breadmore, MC and Guijt, RM, In-plane alloy electrodes for capacitively coupled contactless conductivity detection in poly(methylmethacrylate) electrophoretic chips, Electrophoresis, 34, (20-21) pp. 2980-2987. ISSN 0173-0835 (2013) [Refereed Article]

Copyright Statement

Copyright 2013 2013 WILEY-VCH Verlag GmbH & Co.

DOI: doi:10.1002/elps.201300256

Abstract

A simple method for producing PMMA electrophoresis microchips with in-plane electrodes for capacitively coupled contactless conductivity detection is presented. One PMMA plate (channel plate) is embossed with the microfluidic and electrode channels and lamination bonded to a blank PMMA cover plate of equal dimensions. To incorporate the electrodes, the bonded chip is heated to 80C, above the melting point of the alloy (≈70C) and below the glass transition temperature of the PMMA (≈105C), and the molten alloy drawn into the electrode channels with a syringe before being allowed to cool and harden. A 0.5 mm diameter stainless steel pin is then inserted into the alloy filled reservoirs of the electrode channels to provide external connection to the capacitively coupled contactless conductivity detection detector electronics. This advance provides for a quick and simple manufacturing process and negates the need for integrating electrodes using costly and time-consuming thin film deposition methods. No additional detector cell mounting structures were required and connection to the external signal processing electronics was achieved by simply slipping commercially available shielded adaptors over the pins. With a non-optimised electrode arrangement consisting of a 1 mm detector gap and 100 μm insulating distance, rapid separations of ammonium, sodium and lithium (<22 s) yielded LODs of approximately 1.53.5 ppm.

Item Details

Item Type:Refereed Article
Keywords:C4D, electrode integration, electrophoresis, microchip, PMMA
Research Division:Chemical Sciences
Research Group:Analytical Chemistry
Research Field:Separation Science
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Chemical Sciences
Author:Gaudry, AJ (Mr Adam Gaudry)
Author:Breadmore, MC (Professor Michael Breadmore)
Author:Guijt, RM (Dr Rosanne Guijt)
ID Code:88432
Year Published:2013
Web of Science® Times Cited:12
Deposited By:Austn Centre for Research in Separation Science
Deposited On:2014-02-03
Last Modified:2017-10-30
Downloads:0

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