Most of the fluorine based superhydrophobic materials will under degradation above 400°C? which material can retain its superhydrophobic nature at high temperaure?
There may be specific material that has those properties but I don't know of one. A more common approach I've seen is to micro/nano pattern ceramics (or organics at low T) so that the geometry makes the surface hydrophobic. I've seen this I believe with lithographically defined Si or SiO2x nanopillars, but there are "self assembled" routes too:
Dr. John Nychka at University of Alberta has had success in thermally oxidizing Fe-Cr-Al alloys (at 930 C) to create a rough Al oxide surface. They discuss that any surface with suitable roughness should have high hydrophobicity as predicted by the Cassie-Baxter model. Paper linked below.
www.ncbi.nlm.nih.gov/pubmed/21252413
Thanks for your very useful answer. Do you have any idea about lanthanide oxides based superhydrophobic materials for high temperatures?
Is it possible to prepare ceria based superhydrophobic materials by sol-gel process?
I don't see why not. The precursors would probably be more sensitive and difficult to work with than those for silica but in principle it should be feasible.
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