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Design, Fabrication, and Mechanical Property Analysis of 3D Nanoarchitected Materials

Citation

Meza, Lucas Rosendo (2016) Design, Fabrication, and Mechanical Property Analysis of 3D Nanoarchitected Materials. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/Z9154F1K. http://resolver.caltech.edu/CaltechTHESIS:05232016-115645913

Abstract

Recent developments in micro- and nanoscale 3D fabrication techniques have enabled the creation of materials with a controllable nanoarchitecture that can have structural features spanning 5 orders of magnitude from tens of nanometers to millimeters. These fabrication methods in conjunction with nanomaterial processing techniques permit a nearly unbounded design space through which new combinations of nanomaterials and architecture can be realized. In the course of this work, we designed, fabricated, and mechanically analyzed a wide range of nanoarchitected materials in the form of nanolattices made from polymer, composite, and hollow ceramic beams. Using a combination of two-photon lithography and atomic layer deposition, we fabricated samples with periodic and hierarchical architectures spanning densities over 4 orders of magnitude from ρ=0.3-300kg/m3 and with features as small as 5nm. Uniaxial compression and cyclic loading tests performed on different nanolattice topologies revealed a range of novel mechanical properties: the constituent nanoceramics used here have size-enhanced strengths that approach the theoretical limit of materials strength; hollow aluminum oxide (Al2O3) nanolattices exhibited ductile-like deformation and recovered nearly completely after compression to 50% strain when their wall thicknesses were reduced below 20nm due to the activation of shell buckling; hierarchical nanolattices exhibited enhanced recoverability and a near linear scaling of strength and stiffness with relative density, with E∝ρ1.04 and σy∝ρ1.17 for hollow Al2O3 samples; periodic rigid and non-rigid nanolattice topologies were tested and showed a nearly uniform scaling of strength and stiffness with relative density, marking a significant deviation from traditional theories on “bending” and “stretching” dominated cellular solids; and the mechanical behavior across all topologies was highly tunable and was observed to strongly correlate with the slenderness λ and the wall thickness-to-radius ratio t/a of the beams. These results demonstrate the potential of nanoarchitected materials to create new highly tunable mechanical metamaterials with previously unattainable properties.

Item Type:Thesis (Dissertation (Ph.D.))
Subject Keywords:nanomaterials, nanoarchitecture, ceramic, nanoceramic, cellular solid, materials, shell buckling, metamaterial
Degree Grantor:California Institute of Technology
Division:Engineering and Applied Science
Major Option:Mechanical Engineering
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Greer, Julia R.
Thesis Committee:
  • Ravichandran, Guruswami (chair)
  • Kochmann, Dennis M.
  • Pellegrino, Sergio
  • Greer, Julia R.
Defense Date:4 May 2016
Funders:
Funding AgencyGrant Number
Dow-Resnick Innovation Fund at CaltechN/A
Materials with Controlled Microstructure and Architecture program (DARPA)W91CRB-10-0305
Army Research Office--Institute for Collaborative BiotechnologiesW911NF-09-0001
Office of Naval ResearchN000140910883
NSFCMMI‐1234364
Record Number:CaltechTHESIS:05232016-115645913
Persistent URL:http://resolver.caltech.edu/CaltechTHESIS:05232016-115645913
DOI:10.7907/Z9154F1K
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1038/nmat3738DOIArticle adapted for chapter 2
http://dx.doi.org/10.1007/s10853-013-7945-xDOIArticle adapted for chapter 2
http://dx.doi.org/10.1126/science.1255908DOIArticle adapted for chapter 3
http://dx.doi.org/10.1073/pnas.1509120112DOIArticle adapted for chapter 4
ORCID:
AuthorORCID
Meza, Lucas Rosendo0000-0003-0250-2621
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:9735
Collection:CaltechTHESIS
Deposited By: Lucas Meza
Deposited On:25 May 2016 16:22
Last Modified:06 Sep 2017 20:00

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