Journal
MICROPOROUS AND MESOPOROUS MATERIALS
Volume 223, Issue -, Pages 89-93Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.micromeso.2015.10.044
Keywords
Carbon xerogels; Microwave heating; Tailored porosity; Scanning electron microscope
Categories
Funding
- Ministerio de Economia y Competitividad of Spain MINECO [MAT2011-23733, IPT-2012-0689-420000, BES-2012-052676]
- MINECO
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The hypothesis about the formation of the porous structure of carbon xerogels when the pH and the dilution ratio of the precursor solution are simultaneously modified has been validated by means of scanning electron microscope analysis. The morphology of the carbon xerogels showed that the size and number of the clusters produced during the sol gel reaction is not only influenced by the pH but also by the dilution ratio. As with a decrease in the pH value, an increase in the dilution ratio caused the formation of a small number of large clusters, leading to materials with large pores. However, depending on the values selected the effect of the pH and dilution ratio was enhanced or diminished by the effect of the other. Hence, an appropriate adjustment of these two variables allowed microporous, micro-mesoporous and micro-macroporous materials to be obtained with pore volumes that could not be achieved by modifying the pH or the dilution ratio separately. (C) 2015 Elsevier Inc. All rights reserved.
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