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SUMMARY:DESIGN\, FABRICATION\, AND MECHANICAL CHARACTERIZATION OF 3D HOLLO
 W CERAMIC NANO-ARCHITECTURES - Prof. Dongchan Jang\, KAIST
DTSTART:20181123T143000Z
DTEND:20181123T153000Z
UID:TALK115345@talks.cam.ac.uk
CONTACT:35808
DESCRIPTION:Abstract\n\nDensity-strength tradeoff appears to be an inheren
 t limitation for most materials and therefore design of cell topology that
  mitigates strength decrease with density reduction has been a long-lastin
 g engineering pursue for porous materials. Continuum-mechanics-based analy
 ses on mechanical responses of the conventional porous materials with bend
 ing-dominated structures often give the density-strength scaling law follo
 wing the power-law relationship with exponent of 1.5 or higher\, which con
 sequentially determines the upper bound of the specific strength for a mat
 erial to reach. In this work\, we present a new design criterion capable o
 f significantly abating strength degradation in lightweight materials\, by
  successfully combining size-induced strengthening effect in nanomaterials
  with architectural design of cellular porous materials. Hollow-tube-based
  3D ceramic nano-architectures satisfying such criterion were fabricated i
 n large area using Proximity field nano-Patterning (PnP) and atomic layer 
 deposition (ALD). Experimental data from micro-pillar compression confirme
 d that the strengths of these nano-architectural materials scale with rela
 tive densities with power-law exponent of 0.93\, hardly observable value i
 n the conventional bending-dominated porous materials. Our discovery of ne
 w density-strength scaling law in the nano-architectured materials will co
 ntribute to creating new lightweight structural materials attaining unprec
 edented specific strengths overcoming the conventional limit.\n
LOCATION:Evetts meeting room\, Department of Materials Science & Metallurg
 y
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