期刊
ADVANCED MATERIALS
卷 24, 期 6, 页码 776-+出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201103561
关键词
nanoporous materials; aerogel; fracture; silica; indentation
类别
资金
- U.S. Department of Energy [DE-AC52-07NA27344, DE-AC02-05CH11231]
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.
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