Surface structure and reactivity study of phosphotungstic acid-nitrogenated ormosils

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 sca...

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Autor principal:	Aldabe Bilmes, Sara Alfonsina Dora
Publicado:	2013
Materias:	Hybrid materials Ormosil Phosphotungstic acid Photocatalysis Supramolecular chemistry XPS Nitrogenated groups ORMOSIL Photocatalytic efficiency Reactivity studies Supramolecular interactions Surface reactivity Water contact angle measurement Atomic force microscopy Cyanides Functional groups Photoelectrons Scanning electron microscopy Sol-gels Surface chemistry X ray photoelectron spectroscopy Pumping (laser)
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09280707_v66_n3_p363_FerreiraNeto http://hdl.handle.net/20.500.12110/paper_09280707_v66_n3_p363_FerreiraNeto
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_09280707_v66_n3_p363_FerreiraNeto
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spelling	paper:paper_09280707_v66_n3_p363_FerreiraNeto2023-06-08T15:52:11Z Surface structure and reactivity study of phosphotungstic acid-nitrogenated ormosils Aldabe Bilmes, Sara Alfonsina Dora 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) 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. Fil:Bilmes, S.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2013 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09280707_v66_n3_p363_FerreiraNeto http://hdl.handle.net/20.500.12110/paper_09280707_v66_n3_p363_FerreiraNeto
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	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)
spellingShingle	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) Aldabe Bilmes, Sara Alfonsina Dora Surface structure and reactivity study of phosphotungstic acid-nitrogenated ormosils
topic_facet	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)
description	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.
author	Aldabe Bilmes, Sara Alfonsina Dora
author_facet	Aldabe Bilmes, Sara Alfonsina Dora
author_sort	Aldabe Bilmes, Sara Alfonsina Dora
title	Surface structure and reactivity study of phosphotungstic acid-nitrogenated ormosils
title_short	Surface structure and reactivity study of phosphotungstic acid-nitrogenated ormosils
title_full	Surface structure and reactivity study of phosphotungstic acid-nitrogenated ormosils
title_fullStr	Surface structure and reactivity study of phosphotungstic acid-nitrogenated ormosils
title_full_unstemmed	Surface structure and reactivity study of phosphotungstic acid-nitrogenated ormosils
title_sort	surface structure and reactivity study of phosphotungstic acid-nitrogenated ormosils
publishDate	2013
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09280707_v66_n3_p363_FerreiraNeto http://hdl.handle.net/20.500.12110/paper_09280707_v66_n3_p363_FerreiraNeto
work_keys_str_mv	AT aldabebilmessaraalfonsinadora surfacestructureandreactivitystudyofphosphotungsticacidnitrogenatedormosils
_version_	1768543999907332096

Surface structure and reactivity study of phosphotungstic acid-nitrogenated ormosils

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