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Electrochemical study of o-toluidine blue impregnated in mesoporous silica channels

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Abstract

This paper reports an electrochemical study of ordered mesoporous silica impregnated with a cationic dye (o-toluidine blue), prepared with a non-ionic surfactant as the structure-directing agent. O-toluidine blue was chosen because of its utility as an electron transfer mediator (redox catalyst). O-toluidine blue impregnated mesoporous silica was characterized by nitrogen sorption porosimetry, small angle X-ray scattering, infrared spectroscopy, scanning electron microscopy and cyclic voltammetry using chemically modified carbon paste electrodes. Results indicate that the dye is located within the ordered mesopores of micron-sized silica spheres.

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Acknowledgments

The authors gratefully acknowledge CNPq, FAPESP and FUNDECT-MS for its financial support of this work, and the Brazilian Synchrotron Light Laboratory—LNLS for the SAXS and SEM (LME/LNLS) measurements.

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Authors and Affiliations

  1. Departamento de Química, Universidade Federal de Mato Grosso do Sul—UFMS, C.P. 549, Av. Senador Felinto Muller, 1555, Campo Grande, MS, 79070-900, Brazil

    Marco Antonio Utrera Martines

  2. Departamento de Física e Química, Faculdade de Engenharia de Ilha Solteira—UNESP, Av. Brasil Centro, 56, C.P. 31, Ilha Solteira, SP, 15385-000, Brazil

    Devaney Ribeiro do Carmo & Laércio Caetano

  3. Departamento de Química e Bioquímica, Instituto de Biociências—UNESP, C.P. 510, Botucatu, SP, 18618-970, Brazil

    Gustavo Rocha de Castro

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  1. Marco Antonio Utrera Martines
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  2. Devaney Ribeiro do Carmo
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  3. Gustavo Rocha de Castro
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  4. Laércio Caetano
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Correspondence to Marco Antonio Utrera Martines.

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Martines, M.A.U., do Carmo, D.R., de Castro, G.R. et al. Electrochemical study of o-toluidine blue impregnated in mesoporous silica channels. J Sol-Gel Sci Technol 59, 188–193 (2011). https://doi.org/10.1007/s10971-011-2480-1

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  • DOI: https://doi.org/10.1007/s10971-011-2480-1

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