INVESTIGADORES
ZELCER Andres
artículos
Título:
One-pot synthesis of silica monoliths with hierarchically porous structure
Autor/es:
DRISKO, GLENNA L.; ZELCER, ANDRÉS; CARUSO, RACHEL A.; SOLER-ILLIA, GALO
Revista:
MICROPOROUS AND MESOPOROUS MATERIALS
Editorial:
ELSEVIER SCIENCE BV
Referencias:
Lugar: Amsterdam; Año: 2012 vol. 148 p. 137 - 144
ISSN:
1387-1811
Resumen:
Poly(furfuryl alcohol) (PFA) and block copolymer Pluronic F127 were used
as pore templates to create mechanically robust silica monoliths with a
hierarchical and interconnected macromesoporous network in an easy,
reproducible bimodal scale templating process. Control over the
morphology was obtained by varying the reactant ratios. Phase separation
on the submicrometer scale occurred when furfuryl alcohol was
cationically polymerized and therefore became immiscible with the
solvent and the silica precursor. Upon a subsequent solgel reaction, a
silica-F127 matrix formed around the PFA spheres, leading to macropore
structures with mesoporous walls. Surface areas of the final structures
ranged from 500 to 989 m2 g−1 and a maximum pore volume of 4.5 mL g−1
was achieved. Under mildly acidic conditions, micelle-templated
mesopores resulted. Interconnected macropores could be obtained by
increasing the pH or the block copolymer concentration. The formation
mechanism and the relationship between PFA, Pluronic F127 and acidity
are discussed in detail.