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RF xerogels with tailored porosity over the entire nanoscale

AutorRey Raap, Natalia ; Menéndez Díaz, José Ángel ; Arenillas de la Puente, Ana
Palabras claveSol-gel reaction
Tailored porosity
Microwave heating
Fecha de publicación2014
CitaciónMicroporous and Mesoporous Materials 195: 266-275 (2014)
ResumenResorcinol-formaldehyde organic xerogels were synthesized by means of microwave heating using precursor solutions with pH values ranging from 2 to 9 and dilution ratios between 2 and 42. The objective of this study was to assess the effect of these two chemical variables on the final porous properties of organic xerogels synthesized by microwave heating, using optimal design of response surface methodology. An analysis of variance was applied to the results of the porous characterization of all the samples synthesized. It was found that microporosity and bulk density increased with an increase in the pH and a decrease in the dilution ratio as, under these synthesis conditions, the addition reaction was favored. Maximum mesopore and macropore volume values were achieved for opposed pH-dilution ratio combinations. Thus, when the mesopore volume increases the macropore volume decreases and vice versa. Within the range of pH-dilution ratios studied, materials with an average pore size ranging from 2 nm to 1000 nm were obtained, which covers the entire range of porosity. ©2014 Elsevier Inc. All rights reserved..
Versión del editorhttp://dx.doi.org/10.1016/j.micromeso.2014.04.048
Identificadoresdoi: 10.1016/j.micromeso.2014.04.048
issn: 1387-1811
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