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Electrokinetic control of a chemical reaction in a lab-on-a-chip micro-reactor: measurement and quantitative modelling

Record type: Article

We have investigated the complex formation/dissociation reaction between Ni2+ ions and the ligand pyridine-2-azo-p-dimethylaniline (PADA) in a glass micro-reactor operating under electrokinetic control. An in situ, microscope-imaging technique was used to determine the spatial and temporal evolution of the reaction within the channel network of the micro-reactor. Using appropriately controlled voltage sequences, a slug of PADA was injected into a stream of Ni2+ solution. Under the experimental reaction conditions used, Ni2+ ions are mixed with the PADA as a consequence of the species different electrokinetic mobilities allowing the complex formation to occur at the trailing edge of the PADA slug. Following complex formation, reversal of the flow results in the partial re-formation of free PADA by dissociation of the complex, demonstrating that voltage control can be used to drive the reaction either forwards or backwards. We discuss the methods whereby all the parameters required to predict the spatial and temporal evolution of the reaction in the micro-reactor can be either measured or estimated. Based on the estimated parameters, model calculations of the concentration profiles as a function of time show good agreement with the measured data

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Citation

Fletcher, Paul D.I., Haswell, Stephen J. and Zhang, Xunli (2002) Electrokinetic control of a chemical reaction in a lab-on-a-chip micro-reactor: measurement and quantitative modelling Lab on a Chip, 2, pp. 102-112. (doi:10.1039/b201685k).

More information

Published date: April 2002

Identifiers

Local EPrints ID: 49704
URI: http://eprints.soton.ac.uk/id/eprint/49704
ISSN: 1473-0197
PURE UUID: 9a294f3d-1a1b-4e7b-9219-0a35f46b885e

Catalogue record

Date deposited: 23 Nov 2007
Last modified: 17 Jul 2017 14:55

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Contributors

Author: Paul D.I. Fletcher
Author: Stephen J. Haswell
Author: Xunli Zhang

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