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

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

6 Scopus Citations
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Author(s)

  • Ye-eun Na
  • Dahye Shin
  • Kisun Kim
  • Changui Ahn
  • Dongchan Jang

Detail(s)

Original languageEnglish
Article number1802239
Journal / PublicationSmall
Volume14
Issue number44
Online published4 Oct 2018
Publication statusPublished - 2 Nov 2018
Externally publishedYes

Abstract

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.

Research Area(s)

  • micropillar compression, nanoarchitecture, proximity field nanopatterning, size-induced strengthening

Citation Format(s)

Emergence of New Density–Strength Scaling Law in 3D Hollow Ceramic Nanoarchitectures. / Na, Ye-eun; Shin, Dahye; Kim, Kisun; Ahn, Changui; Jeon, Seokwoo; Jang, Dongchan.

In: Small, Vol. 14, No. 44, 1802239, 02.11.2018.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal