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Abstract:

Amino-functionalized mesoporous hybrid thin films were synthesized by co-condensation and post-grafting routes. These materials were characterized by X-ray photoelectron spectroscopy (XPS), small angle X-ray scattering (SAXS-2D), X-ray reflectometry (XRR) and transmission electron microscopy (TEM). The chemical reactivity of the amine functional groups was determined via amidation with trifluoroacetic acid anhydride and characterized with XPS and contact angle measurements. We found that the amidation reaction proceeds successfully in both cases showing that the amine functionalities are available for reaction in the films obtained by both synthesis routes. However we also found that the fraction of amine functionalities available for reaction depends strongly on the functionalization route: ∼37% of amine functional groups are available for reaction in post-grafted films whereas ∼16% of them are available in co-condensed films. This difference can be rationalized in terms of the different nature of the synthesis routes employed as in co-condensed films a fraction of amine functions are contained within the oxide backbone and thus unavailable for reaction. Our findings are important in the designed of functional materials where chemical functionalization might be a crucial step. © 2009 Elsevier Inc. All rights reserved.

Registro:

Documento: Artículo
Título:Chemical reactivity of amino-functionalized mesoporous silica thin films obtained by co-condensation and post-grafting routes
Autor:Calvo, A.; Joselevich, M.; Soler-Illia, G.J.A.A.; Williams, F.J.
Filiación:Gerencia de Química, CNEA, Centro Atómico Constituyentes, Av. Gral Paz 1499, San Martín, B1650KNA, Argentina
Universidad de Buenos Aires, DQIAyQF, FCEN, Ciudad Universitaria, Pabellon II, C1428EHA Buenos Aires, Argentina
Departamento de Química de Superficies y Recubrimientos, TENARIS, Simini 250, Campana, B2804MHA Buenos Aires, Argentina
Palabras clave:Amidation; Amino; Chemical reaction; Co-condensation; Functionalization; Mesoporous hybrid thin films; Post-grafting; Amination; Amines; Angle measurement; Chemical reactivity; Cobalt; Condensation; Condensation reactions; Contact angle; Functional groups; Functional materials; Grafting (chemical); Mesoporous materials; Newtonian flow; Oxide films; Silica; Synthesis (chemical); Thin films; Transmission electron microscopy; Amidation; Amino; Co-condensation; Functionalization; Mesoporous hybrid thin films; Post-grafting; X ray photoelectron spectroscopy
Año:2009
Volumen:121
Número:1-3
Página de inicio:67
Página de fin:72
DOI: http://dx.doi.org/10.1016/j.micromeso.2009.01.005
Título revista:Microporous and Mesoporous Materials
Título revista abreviado:Microporous Mesoporous Mater.
ISSN:13871811
CODEN:MIMMF
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_13871811_v121_n1-3_p67_Calvo

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Citas:

---------- APA ----------
Calvo, A., Joselevich, M., Soler-Illia, G.J.A.A. & Williams, F.J. (2009) . Chemical reactivity of amino-functionalized mesoporous silica thin films obtained by co-condensation and post-grafting routes. Microporous and Mesoporous Materials, 121(1-3), 67-72.
http://dx.doi.org/10.1016/j.micromeso.2009.01.005
---------- CHICAGO ----------
Calvo, A., Joselevich, M., Soler-Illia, G.J.A.A., Williams, F.J. "Chemical reactivity of amino-functionalized mesoporous silica thin films obtained by co-condensation and post-grafting routes" . Microporous and Mesoporous Materials 121, no. 1-3 (2009) : 67-72.
http://dx.doi.org/10.1016/j.micromeso.2009.01.005
---------- MLA ----------
Calvo, A., Joselevich, M., Soler-Illia, G.J.A.A., Williams, F.J. "Chemical reactivity of amino-functionalized mesoporous silica thin films obtained by co-condensation and post-grafting routes" . Microporous and Mesoporous Materials, vol. 121, no. 1-3, 2009, pp. 67-72.
http://dx.doi.org/10.1016/j.micromeso.2009.01.005
---------- VANCOUVER ----------
Calvo, A., Joselevich, M., Soler-Illia, G.J.A.A., Williams, F.J. Chemical reactivity of amino-functionalized mesoporous silica thin films obtained by co-condensation and post-grafting routes. Microporous Mesoporous Mater. 2009;121(1-3):67-72.
http://dx.doi.org/10.1016/j.micromeso.2009.01.005