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Ultralight Metallic Microlattices

Schaedler, T. A. and Jacobsen, A. J. and Torrents, A. and Sorensen, A. E. and Lian, J. and Greer, J. R. and Valdevit, L. and Carter, W. B. (2011) Ultralight Metallic Microlattices. Science, 334 (6058). pp. 962-965. ISSN 0036-8075.

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Ultralight (<10 milligrams per cubic centimeter) cellular materials are desirable for thermal insulation; battery electrodes; catalyst supports; and acoustic, vibration, or shock energy damping. We present ultralight materials based on periodic hollow-tube microlattices. These materials are fabricated by starting with a template formed by self-propagating photopolymer waveguide prototyping, coating the template by electroless nickel plating, and subsequently etching away the template. The resulting metallic microlattices exhibit densities ρ ≥ 0.9 milligram per cubic centimeter, complete recovery after compression exceeding 50% strain, and energy absorption similar to elastomers. Young’s modulus E scales with density as E ~ ρ^2, in contrast to the E ~ ρ^3 scaling observed for ultralight aerogels and carbon nanotube foams with stochastic architecture. We attribute these properties to structural hierarchy at the nanometer, micrometer, and millimeter scales.

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URLURL TypeDescription DOIArticle
Greer, J. R.0000-0002-9675-1508
Additional Information:© 2011 American Association for the Advancement of Science. Received for publication 25 July 2011; Accepted for publication 12 October 2011. The authors gratefully acknowledge the financial support by Defense Advanced Research Projects Agency under the Materials with Controlled Microstructural Architecture program managed by J. Goldwasser (contract no. W91CRB-10-0305) and thank J. W. Hutchinson and C. S. Roper for useful discussions. A patent application regarding the structure and formation process of the ultralight microlattices has been submitted to the U.S. Patent and Trademark Office. The polymer waveguide process has been patented (U.S. Patent 7,382,959, U.S. Patent 7,653,279, and U.S. Patent 8,017,193), but the template can be fabricated in other ways.
Group:Kavli Nanoscience Institute
Funding AgencyGrant Number
Army Research Office (ARO)W91CRB-10-0305
Defense Advanced Research Projects Agency (DARPA)UNSPECIFIED
Issue or Number:6058
Record Number:CaltechAUTHORS:20111207-112803529
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:28347
Deposited By: Jason Perez
Deposited On:09 Dec 2011 15:29
Last Modified:03 Oct 2019 03:31

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