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    Flow-injection amperometry at microfabricated silicon-based μ-liquid–liquid interface arrays

    153206_153206.pdf (407.8Kb)
    Access Status
    Open access
    Authors
    Scanlon, M.
    Berduque, A.
    Strutwolf, J.
    Arrigan, Damien
    Date
    2010
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Scanlon, Micheal D. and Berduque, Alfonso and Strutwolf, Jorg and Arrigan, Damien W.M. 2010. Flow-injection amperometry at microfabricated silicon-based μ-liquid–liquid interface arrays. Electrochimica Acta. 55 (14): pp. 4234-4239.
    Source Title
    Electrochimica Acta
    DOI
    10.1016/j.electacta.2008.12.014
    ISSN
    00134686
    School
    Nanochemistry Research Institute (Research Institute)
    Remarks

    NOTICE: this is the author’s version of a work that was accepted for publication in Electrochimica Acta. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Electrochimica Acta [55, 14, 2010] DOI 10.1016/j.electacta.2008.12.014

    URI
    http://hdl.handle.net/20.500.11937/28837
    Collection
    • Curtin Research Publications
    Abstract

    Geometrically regular silicon membrane-based micropore arrays were employed for defined arrays of micrometer-sized interfaces between two immiscible electrolyte solutions (μITIES). These were incorporated into a poly(tetrafluoroethylene) (PTFE) hydrodynamic cell. Electrochemistry at the μITIES array was undertaken following gellification of the organic phase using polyvinyl chloride (PVC) and flowing an aqueous phase over the array surface. Cyclic voltammetric characterization of asymmetric diffusion profiles on either side of the μITIES was accomplished under flowing conditions using positively and negatively charged (TEA+ and 4-OBSA−, respectively) model analyte species. Incorporation of an ionophore (dibenzo-18-crown-6 ether) into the organogel allowed the ion-transfer detection of two oligopeptides (phenylalanine dipeptide and lysine dipeptide) within the available potential window under stationary and flowing conditions.Flow rate studies with TEA+ indicated that the amperometric peak currents do not obey the Levich equation, due to diffusion dominating the mass transport, as opposed to convection. The influence of the applied potential () on the amperometric response of the oligopeptides was studied and hydrodynamic voltammograms (HDVs) for the individual oligopeptides were subsequently constructed. The data presented provide a basis for the use of silicon membrane-based μITIES arrays in flow analytical methods.

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