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Título

Silica xerogels of tailored porosity as support matrix for optical chemical sensors. Simultaneous effect of pH, ethanol:TEOS and water:TEOS molar ratios, and synthesis temperature on gelation time, and textural and structural properties

AutorEstella, Juncal; Echeverría, Jesús C.; Laguna, Mariano ; Garrido, Julián J.
Palabras claveSol–gel
Sol–gels (xerogels)
Adsorption
Aerogel and solution chemistry
Fecha de publicaciónmar-2007
EditorElsevier
CitaciónJournal of Noncrystalline Solids 353(3): 286-294 (2007)
ResumenThe sensing of a chemical environment is achieved mainly in the surface by interactions of the sensor material with its chemical surroundings. Therefore, porous structure control is key in developing good chemical sensors. The aim of this work was to obtain materials of tailored porosity to be used as support matrix for optical chemical sensors. We studied the simultaneous effect of pH, temperature, ethanol:TEOS, and water:TEOS molar ratios on gelation time, and textural and structural properties. We used a 24 factorial design that evaluates the effect of each independent variable and their interactions. Samples were characterized by XRD, SEM, FTIR, and gas adsorption (N2 at 77 K and CO2 at 273 K). The gelation time decreased with increasing temperature, water:TEOS molar ratio, and pH; and with decreasing ethanol:TEOS molar ratios. Synthesis conditions also affected the xerogels porous textures. Xerogels obtained at pH 2.5 were ultramicroporous. In general, samples synthesized at pH 4.5 and ethanol:TEOS molar ratio of 2.25:1 were mesoporous, but the material is not appropriate for use as support in fiber optical sensors.
Descripción9 pages, 6 figures, 4 tables.
Versión del editorhttp://dx.doi.org/10.1016/j.jnoncrysol.2006.12.006
URIhttp://hdl.handle.net/10261/19298
DOI10.1016/j.jnoncrysol.2006.12.006
ISSN0022-3093
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