Direct synthesis of zirconia aerogel nanoarchitecture in supercritical CO2

Langmuir : the ACS Journal of Surfaces and Colloids
Ruohong SuiPaul A Charpentier

Abstract

The objective of the present study was to synthesize porous ZrO2 aerogels with a nanostructure via a direct sol-gel route in the green solvent supercritical carbon dioxide (scCO2). The synthesis involved the coordination and polycondensation of a zirconium alkoxide using acetic acid in CO2, followed by scCO2 drying and calcination. Either a translucent or opaque monolith was obtained, which was subsequently characterized by electron microscopy, X-ray diffraction, thermal analysis, N2 physisorption, and infrared spectroscopy analysis. The electron microscopy results showed that the translucent monolithic ZrO2 exhibited a well-defined mesoporous structure, while the opaque monolith, formed using added alcohol as a cosolvent, was composed of loosely compacted nanospherical particles with a diameter of ca. 20 nm. After calcination at 400 and 500 degrees C, X-ray diffraction results indicated that the ZrO2 exhibited tetragonal and/or monoclinic phases. In situ infrared spectroscopy results showed the formation of a Zr-acetate coordinate complex at the initial stage of the polycondensation, followed by further condensation of the complex into macromolecules.

References

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Jun 29, 2005·Langmuir : the ACS Journal of Surfaces and Colloids·Ruohong SuiPaul A Charpentier

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Citations

Apr 8, 2010·Journal of Separation Science·Ruohong SuiPaul A Charpentier
Jan 1, 2017·Nanoscale Horizons : the Home for Rapid Reports of Exceptional Significance in Nanoscience and Nanotechnolgy·Felix Rechberger, Markus Niederberger
Oct 10, 2020·Global Challenges·Brian J Riley, Saehwa Chong
Feb 10, 2010·Langmuir : the ACS Journal of Surfaces and Colloids·Muhammad B I ChowdhuryPaul A Charpentier
Aug 8, 2021·Advances in Colloid and Interface Science·Rebecca C WalkerJames K Ferri
Sep 6, 2018·ACS Applied Materials & Interfaces·Mateusz OdziomekStephane Parola
Aug 18, 2006·The Journal of Physical Chemistry. B·Ruohong SuiPaul A Charpentier

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