Inclusion of [H3PW12O40] and [H4SiW12O40] into a silica gel matrix via "sol-gel" methodology
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Fecha
2017-03
Profesor/a Guía
Facultad/escuela
Idioma
en
Título de la revista
ISSN de la revista
Título del volumen
Editor
Sociedad Chilena de Química
Nombre de Curso
Licencia CC
Licencia CC
https://creativecommons.org/licenses/by-nc/4.0/deed.en
Resumen
Here we report the inclusion of two Keggin Polyoxometalates (POMs), [H3PW12O40] and [H4SiW12O40], into silica gels by integrating them during the preparation of the SiO2 matrix via "sol-gel" methods. Aerogels were produced by supercritical drying of the wet gels impregnated with the POMs, and lyogels were obtained by means of a lyophilization process. These materials were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transformed infrared (FT-IR) spectroscopy and thermoanalytical techniques (TGA-DSC). We found that a large fraction of POMs are lost during the aging time, and solvent exchange for lyophilization. However the thermal stability of the bare matrix is modified by the inclusion of POMs. Some aggregates with a high content of POMs were found via SEM-EDX.
Notas
Indexación: Web of Science; Scopus.
Palabras clave
Aerogel, Keggin, Lyogel, Polyoxometalates, Silica gel
Citación
Journal of the Chilean Chemical Society. Volume 62, Issue 1, March 2017, Pages 3322-3324