Abstract:
Supramolecular interactions between nitrogenated groups in hybrid ormosils bearing phosphotungstate nanocatalyst were used to tune the photocatalytical activity of these class-II hybrid materials obtained through sol-gel chemistry. Surface chemistry and morphology of the materials was studied by scanning electron microscopy, atomic force microscopy, X-ray photoelectron spectroscopy and water contact angle measurements. The photocatalytic efficiency of these hybrid films, measured by the degradation of crystal violet over-layer deposited on ormosils films, is higher for ormosils bearing neutral, more polar and less H-bonding nitrile groups than those bearing alkylamine/alkylammonium functionalities, despite the lower W/Si atomic ratio on the surface and lower tungsten percentage of the pure nitrile bearing ormosils. Such higher surface reactivity of the nitrile bearing ormosils is due to weaker interaction with the phosphotungstate and the lower activity of amine bearing ormosils is attributed to the competition among reversible photochromism and photocatalysis pathways in these materials. © 2013 Springer Science+Business Media New York.
Registro:
Documento: |
Artículo
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Título: | Surface structure and reactivity study of phosphotungstic acid-nitrogenated ormosils |
Autor: | Ferreira-Neto, E.P.; De Carvalho, F.L.S.; Ullah, S.; Zoldan, V.C.; Pasa, A.A.; De Souza, A.L.; Battirola, L.C.; Rudolf, P.; Bilmes, S.A.; Rodrigues-Filho, U.P. |
Filiación: | Instituto de Química de São Carlos, Universidade de São Paulo, São Carlos 13560-970, Brazil Laboratório de Filmes Finos e Superfícies, Departamento de Física, Universidade Federal de Santa Catarina, Florianópolis 88040-900, Brazil Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, Netherlands Instituto de Química Física de Los Materiales, Facultad Ciencias Exactas y Naturales, Ciudad Universitaria Pab.2, C1428EHA Buenos Aires, Argentina
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Palabras clave: | Hybrid materials; Ormosil; Phosphotungstic acid; Photocatalysis; Supramolecular chemistry; XPS; Nitrogenated groups; ORMOSIL; Phosphotungstic acid; Photocatalytic efficiency; Reactivity studies; Supramolecular interactions; Surface reactivity; Water contact angle measurement; Atomic force microscopy; Cyanides; Functional groups; Hybrid materials; Photocatalysis; Photoelectrons; Scanning electron microscopy; Sol-gels; Supramolecular chemistry; Surface chemistry; X ray photoelectron spectroscopy; Pumping (laser) |
Año: | 2013
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Volumen: | 66
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Número: | 3
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Página de inicio: | 363
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Página de fin: | 371
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DOI: |
http://dx.doi.org/10.1007/s10971-013-3018-5 |
Título revista: | Journal of Sol-Gel Science and Technology
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Título revista abreviado: | J Sol Gel Sci Technol
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ISSN: | 09280707
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CODEN: | JSGTE
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Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09280707_v66_n3_p363_FerreiraNeto |
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Citas:
---------- APA ----------
Ferreira-Neto, E.P., De Carvalho, F.L.S., Ullah, S., Zoldan, V.C., Pasa, A.A., De Souza, A.L., Battirola, L.C.,..., Rodrigues-Filho, U.P.
(2013)
. Surface structure and reactivity study of phosphotungstic acid-nitrogenated ormosils. Journal of Sol-Gel Science and Technology, 66(3), 363-371.
http://dx.doi.org/10.1007/s10971-013-3018-5---------- CHICAGO ----------
Ferreira-Neto, E.P., De Carvalho, F.L.S., Ullah, S., Zoldan, V.C., Pasa, A.A., De Souza, A.L., et al.
"Surface structure and reactivity study of phosphotungstic acid-nitrogenated ormosils"
. Journal of Sol-Gel Science and Technology 66, no. 3
(2013) : 363-371.
http://dx.doi.org/10.1007/s10971-013-3018-5---------- MLA ----------
Ferreira-Neto, E.P., De Carvalho, F.L.S., Ullah, S., Zoldan, V.C., Pasa, A.A., De Souza, A.L., et al.
"Surface structure and reactivity study of phosphotungstic acid-nitrogenated ormosils"
. Journal of Sol-Gel Science and Technology, vol. 66, no. 3, 2013, pp. 363-371.
http://dx.doi.org/10.1007/s10971-013-3018-5---------- VANCOUVER ----------
Ferreira-Neto, E.P., De Carvalho, F.L.S., Ullah, S., Zoldan, V.C., Pasa, A.A., De Souza, A.L., et al. Surface structure and reactivity study of phosphotungstic acid-nitrogenated ormosils. J Sol Gel Sci Technol. 2013;66(3):363-371.
http://dx.doi.org/10.1007/s10971-013-3018-5