Emergence of New Density-Strength Scaling Law in 3D Hollow Ceramic Nanoarchitectures

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Density-strength tradeoff appears to be an inherent limitation for most materials and therefore design of cell topology that mitigates strength decrease with density reduction has been a long-lasting engineering pursue for porous materials. Continuum-mechanics-based analyses of mechanical responses of conventional porous materials with bending-dominated structures often give the density-strength scaling law following the power-law relationship with an exponent of 1.5 or higher, which consequentially determines the upper bound of the specific strength for a material to reach. In this work, a new design criterion capable of significantly abating strength degradation in lightweight materials is presented, by successfully combining the size-induced strengthening effect in nanomaterials with the architectural design of cellular porous materials. Hollow-tube-based 3D ceramic nanoarchitectures satisfying such criterion are fabricated in large area using proximity field nano-patterning and atomic layer deposition. Experimental data from micropillar compression confirm that the strengths of these nanoarchitectural materials scale with relative densities with a power-law exponent of 0.93, a hardly observable value in conventional bending-dominated porous materials. This discovery of a new density-strength scaling law in nanoarchitectured materials will contribute to creating new lightweight structural materials attaining unprecedented specific strengths overcoming the conventional limit.
Publisher
WILEY-V C H VERLAG GMBH
Issue Date
2018-11
Language
English
Article Type
Article
Citation

SMALL, v.14, no.44, pp.1802239

ISSN
1613-6810
DOI
10.1002/smll.201802239
URI
http://hdl.handle.net/10203/249173
Appears in Collection
MS-Journal Papers(저널논문)NE-Journal Papers(저널논문)
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