Abstract
Interpenetrating native and polymer-crosslinked resorcinol-formaldehyde (RF) and metal oxide (MOx) networks have been synthesized in one pot through the catalytic effect of gelling solutions of hydrated metal ions on the gelation of RF. Pyrolysis under argon (Ar) induces carbothermal processes that, depending on the chemical identity of MOx, yield either metals in the element form or the corresponding carbides. RF–MOx networks in the xerogel and polymer-crosslinked aerogel (X-aerogel) forms undergo those processes at temperatures up to 400°C lower than in the native aerogel form. In addition to the significance of the RF–MOx interpenetrating networks in the design of new materials (mesoporous and macroporous monolithic metals and carbides), the effect of the compactness of the nanostructure on the activation of the carbothermal processes has important implications for process design engineering.
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Notes
- 1.
ρ s,FeOx = 3.03 ± 0.07 g cm−3; ρ s,NiOx = 3.7 ± 0.4 g cm−3; ρ s,SnOx = 3.0 ± 0.1 g cm−3; ρ s,CrOx = 3.69 ± 0.03g cm−3; ρ s,TiOx = 3.77 ± 0.07 g cm−3; ρ s,HfOx =3.8 ± 0.2 g cm−3; ρ s,YOx =2.39 ± 0.03 g cm−3; ρ s,DyOx =3.02 ± 0.05 g cm−3.
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Acknowledgments
The author would like to thank the Army Research Office (W911NF-10-1-0476) and the National Science Foundation (CHE-0809562 and CMMI-0653919) for financial support, the Materials Research Center of Missouri S&T for support in sample characterization (SEM and XRD), co-investigator Professor Chariklia Sotiriou-Leventis, and the graduate students who have contributed to this effort: Naveen Chandrasekaran, Sudhir Mulik, and Anand G. Sadekar.
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Leventis, N. (2011). Interpenetrating Organic/Inorganic Networks of Resorcinol-Formaldehyde/Metal Oxide Aerogels. In: Aegerter, M., Leventis, N., Koebel, M. (eds) Aerogels Handbook. Advances in Sol-Gel Derived Materials and Technologies. Springer, New York, NY. https://doi.org/10.1007/978-1-4419-7589-8_14
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