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Stable Aqueous Solutions of Naked Titanate Nanotubes

Authors

  • Prof. Lucio Zennaro,

    1. Dipartimento di Medicina Molecolare, Università di Padova and Istituto Nazionale di Biostrutture e Biosistemi via G. Colombo 3, 35100 Padova (Italy)
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  • Dr. Massimiliano Magro,

    1. Dipartimento di Biomedicina Comparata ed Alimentazione, Università di Padova via G. Colombo 3, 35100 Padova (Italy)
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  • Prof. Fabio Vianello,

    1. Dipartimento di Biomedicina Comparata ed Alimentazione, Università di Padova via G. Colombo 3, 35100 Padova (Italy)
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  • Prof. Adelio Rigo,

    1. Dipartimento di Medicina Molecolare, Università di Padova and Istituto Nazionale di Biostrutture e Biosistemi via G. Colombo 3, 35100 Padova (Italy)
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  • Prof. Gino Mariotto,

    1. Dipartimento di Informatica, Università di Verona, Strada le Grazie 15, 37134 Verona (Italy)
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  • Dr. Marco Giarola,

    1. Dipartimento di Informatica, Università di Verona, Strada le Grazie 15, 37134 Verona (Italy)
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  • Dr. Elena Froner,

    1. Dipartimento di Fisica, Università di Trento and Istituto Nazionale di Biostrutture e Biosistemi via Sommarive 14, 38123 Povo Trento (Italy), Fax: (+39) 0461282967
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  • Prof. Marina Scarpa

    Corresponding author
    1. Dipartimento di Fisica, Università di Trento and Istituto Nazionale di Biostrutture e Biosistemi via Sommarive 14, 38123 Povo Trento (Italy), Fax: (+39) 0461282967
    • Dipartimento di Fisica, Università di Trento and Istituto Nazionale di Biostrutture e Biosistemi via Sommarive 14, 38123 Povo Trento (Italy), Fax: (+39) 0461282967
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Abstract

Aqueous solutions of naked nanotubes with Ti concentration up to 10 mM are obtained by hydrothermal synthesis followed by extensive ultrasound treatment. The morphology, surface characteristics, and solution behavior of the solubilized nanotubes are investigated. The time course of the solubilization process driven by ultrasound follows a first-order kinetic law and is mediated by the competition between Na+ and H+ for surface sites. The dynamics of interaction with small cations (i.e. the sodium ion) is studied by nuclear magnetic resonance spectroscopy and is demonstrated to be a multifaced process, since Na+ is in part free to exchange between the binding sites on nanotubes and the bulk and in part is confined to slowly exchanging nanotube sites. The aqueous titanate nanotube solutions are stable for months, thus opening new perspectives for the use of this material in drug delivery and in homogeneous photocatalysis.

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