Effect of electrostatic interactions on gate effect in molecularly imprinted polymers

Koji Hattori, Yasuo Yoshimi, Toru Ito, Katsuhiko Hirano, Fukashi Kohori, Kiyotaka Sakai

    Research output: Contribution to journalArticle

    6 Citations (Scopus)

    Abstract

    The mechanism of the change in diffusive permeability of nanometer-ordered thin layers of molecularly imprinted polymer (MIP) in the presence of its template is examined and discussed based on electrostatic interactions. In this work, the theophylline-imprinted copolymer of ethyleneglycol dimethacrylate and methacrylic acid (Theo-MIP) is grafted onto indium-tin oxide (ITO) as an electrode for cyclic voltammetry of ferrocyanide with the grafted ITO, and the permeability of the Theo-MIP is estimated from the faradic current. The permeability is found to decrease with increasing pH, and the change in permeability due to the presence of the template is found to decrease with increasing concentration of the supporting electrolyte. These results indicate that the layer of grafted copolymer swells due to electric repulsion between carboxyl groups, representing a major factor in the gate effect of the Theo-MIP. If the grafted layer is considered to be porous, the porosity of Theo-MIP should increase as the polymer shrinks, and decrease as it swells. The increase in the permeability of the MIP in the presence of the template is therefore due to the increase in porosity due to shrinking.

    Original languageEnglish
    Pages (from-to)508-510
    Number of pages3
    JournalElectrochemistry
    Volume72
    Issue number7
    Publication statusPublished - 2004 Jul

    Fingerprint

    Coulomb interactions
    Polymers
    Tin oxides
    Indium
    Copolymers
    Porosity
    Theophylline
    Electrolytes
    Cyclic voltammetry
    Electrodes
    Acids

    Keywords

    • Cyclic Voltammetry
    • Electrostatic Interaction
    • Gate Effect
    • Molecularly Imprinted Polymer

    ASJC Scopus subject areas

    • Electrochemistry

    Cite this

    Hattori, K., Yoshimi, Y., Ito, T., Hirano, K., Kohori, F., & Sakai, K. (2004). Effect of electrostatic interactions on gate effect in molecularly imprinted polymers. Electrochemistry, 72(7), 508-510.

    Effect of electrostatic interactions on gate effect in molecularly imprinted polymers. / Hattori, Koji; Yoshimi, Yasuo; Ito, Toru; Hirano, Katsuhiko; Kohori, Fukashi; Sakai, Kiyotaka.

    In: Electrochemistry, Vol. 72, No. 7, 07.2004, p. 508-510.

    Research output: Contribution to journalArticle

    Hattori, K, Yoshimi, Y, Ito, T, Hirano, K, Kohori, F & Sakai, K 2004, 'Effect of electrostatic interactions on gate effect in molecularly imprinted polymers', Electrochemistry, vol. 72, no. 7, pp. 508-510.
    Hattori K, Yoshimi Y, Ito T, Hirano K, Kohori F, Sakai K. Effect of electrostatic interactions on gate effect in molecularly imprinted polymers. Electrochemistry. 2004 Jul;72(7):508-510.
    Hattori, Koji ; Yoshimi, Yasuo ; Ito, Toru ; Hirano, Katsuhiko ; Kohori, Fukashi ; Sakai, Kiyotaka. / Effect of electrostatic interactions on gate effect in molecularly imprinted polymers. In: Electrochemistry. 2004 ; Vol. 72, No. 7. pp. 508-510.
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