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In-plane alloy electrodes for capacitively coupled contactless conductivity detection in poly(methylmethacrylate) electrophoretic chips
Citation
Gaudry, A 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 80 Celsius degree, above the melting point of the alloy (~70 Celsius degree)
and below the glass transition temperature of the PMMA (~105 Celsius degree), 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 um
insulating distance, rapid separations of ammonium, sodium and lithium (<22 s) yielded
LODs of approximately 1.5-3.5 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 |
| UTAS Author: | Gaudry, A (Mr Adam Gaudry) |
| UTAS Author: | Breadmore, MC (Professor Michael Breadmore) |
| UTAS Author: | Guijt, RM (Dr Rosanne Guijt) |
| ID Code: | 88432 |
| Year Published: | 2013 |
| Web of Science® Times Cited: | 22 |
| Deposited By: | Austn Centre for Research in Separation Science |
| Deposited On: | 2014-02-03 |
| Last Modified: | 2022-08-30 |
| Downloads: | 0 |
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