Synthesis and Characterization of Ratiometric Ion-Sensitive Polyelectrolyte Capsules

Authors

  • Loretta L. del Mercato,

    1. Fachbereich Physik and Wissenschaftliches Zentrum für, Materialwissenschaften, Philipps Universität Marburg, Marburg, Germany
    Current affiliation:
    1. Current address: Nanoscience Institute - CNR, National Nanotechnology Laboratory (NNL), Lecce, Italy
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  • Azhar Z. Abbasi,

    1. Fachbereich Physik and Wissenschaftliches Zentrum für, Materialwissenschaften, Philipps Universität Marburg, Marburg, Germany
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  • Wolfgang J. Parak

    Corresponding author
    1. Fachbereich Physik and Wissenschaftliches Zentrum für, Materialwissenschaften, Philipps Universität Marburg, Marburg, Germany
    • Fachbereich Physik and Wissenschaftliches Zentrum für, Materialwissenschaften, Philipps Universität Marburg, Marburg, Germany.
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Abstract

Micrometer-sized polyelectrolyte capsules are synthesized, which have ion-sensitive fluorophores embedded in their cavities. As the membranes of the capsules are permeable to ions, the fluorescence of the capsules changed with the ion concentration. In particular, capsules sensitive to protons, sodium, potassium, and chloride ions are fabricated and their fluorescence response analyzed. In order to allow for ratiometric measurements, additional fluorophores whose emission do not depend on the ion concentration and which emit a different wavelength are co-embedded in the capsule cavities.

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