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    An Electrochemical Sensing Platform Based on Liquid-Liquid Microinterface Arrays Formed in Laser-Ablated Glass Membranes

    239128_239128.pdf (1.477Mb)
    Access Status
    Open access
    Authors
    Alvarez De Eulate, Eva
    Strutwolf, J.
    Liu, Yang
    O'Donnell, Kane
    Arrigan, Damien
    Date
    2016
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Alvarez De Eulate, E. and Strutwolf, J. and Liu, Y. and O'Donnell, K. and Arrigan, D. 2016. An Electrochemical Sensing Platform Based on Liquid-Liquid Microinterface Arrays Formed in Laser-Ablated Glass Membranes. Analytical Chemistry. 88 (5): pp. 2596-2604.
    Source Title
    Analytical Chemistry
    DOI
    10.1021/acs.analchem.5b03091
    ISSN
    0003-2700
    School
    Nanochemistry Research Institute
    Funding and Sponsorship
    http://purl.org/au-research/grants/arc/LE120100026
    http://purl.org/au-research/grants/arc/DP130102040
    Remarks

    This document is the Accepted Manuscript version of a Published Work that appeared in final form in Analytical Chemistry, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see http://doi.org/10.1021/acs.analchem.5b03091

    URI
    http://hdl.handle.net/20.500.11937/45849
    Collection
    • Curtin Research Publications
    Abstract

    Arrays of microscale interfaces between two immiscible electrolyte solutions (µITIES) were formed using glass membranes perforated with microscale pores by laser ablation. Square arrays of 100 micropores in 130 µm thick borosilicate glass coverslips were functionalized with trichloro(1H,1H,2H,2H-perfluorooctyl)silane on one side, to render the surface hydrophobic and support the formation of aqueous-organic liquid-liquid microinterfaces. The pores show a conical shape, with larger radii at the laser entry side (26.5 µm) than at the laser exit side (11.5 µm). The modified surfaces were characterized by contact angle measurements and X-ray photoelectron spectroscopy. The organic phase was placed on the hydrophobic side of the membrane, enabling the array of µITIES to be located at either the wider or narrower pore mouth. The electrochemical behavior of the µITIES arrays were investigated by tetrapropylammonium ion transfer across water-1,6-dichlorohexane interfaces together with finite element computational simulations. The data suggest that the smallest microinterfaces (formed on the laser exit side) were located at the mouth of the pore in hemispherical geometry, while the larger microinterfaces (formed on the laser entry side) were flatter in shape but exhibited more instability due to the significant roughness of the glass around the pore mouths. The glass membrane-supported µITIES arrays presented here provide a new platform for chemical and biochemical sensing systems. © 2016 American Chemical Society.

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