Three Dimensional Core-shell Superstructures: Mechanically Strong Aerogels
Nanocasting conformal polymer coatings on preformed three-dimensional assemblies of nanoparticles, macroscopically classified as aerogels, reinforces the interparticle necks and increases the strength of the bulk material dramatically. For example, specific compressive strengths are reported to be higher than those for mild steel and aluminum, while the ability to store energy may surpass that of armor grade ceramics. Specific chemistries have been developed for cross-linking skeletal nanoparticles with polyureas and polyurethanes, epoxies, and polystyrene, while the technology has been demonstrated with ~30 different nanoparticle networks in addition to silica.
N. Leventis, "Three Dimensional Core-shell Superstructures: Mechanically Strong Aerogels," Accounts of Chemical Research, American Chemical Society (ACS), Jan 2007.
The definitive version is available at http://dx.doi.org/10.1021/ar600033s
NASA GRC Science Advisory Board
University of Missouri Research Board
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© 2007 American Chemical Society (ACS), All rights reserved.