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Super‐Compressibility of Ultralow‐Density Nanoporous Silica
Author(s) -
Kucheyev S. O.,
Stadermann M.,
Shin S. J.,
Satcher J. H.,
Gammon S. A.,
Letts S. A.,
van Buuren T.,
Hamza A. V.
Publication year - 2012
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201103561
Subject(s) - nanoporous , materials science , porosity , compressibility , composite material , ceramic , fracture (geology) , relative density , deformation (meteorology) , nanotechnology , microstructure , thermodynamics , physics
Porosity generally embrittles ceramics . In contrast to such expectations, this report demonstrates that an effective fracture strain of nanoporous silica aerogels increases with increasing porosity. At ultralow relative densities of <0.5%, nanoporous monoliths start exhibiting super‐compressible deformation with effective fracture strains of >50%. This is attributed to consequences of an increase in the aspect ratio of ligaments with decreasing density.