Publication Date:
2011-11-19
Description:
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 rho 〉/= 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 ~ rho(2), in contrast to the E ~ rho(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.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Schaedler, T A -- Jacobsen, A J -- Torrents, A -- Sorensen, A E -- Lian, J -- Greer, J R -- Valdevit, L -- Carter, W B -- New York, N.Y. -- Science. 2011 Nov 18;334(6058):962-5. doi: 10.1126/science.1211649.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉HRL Laboratories Limited Liability Company, Malibu, CA 90265, USA. taschaedler@hrl.com〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/22096194" target="_blank"〉PubMed〈/a〉
Print ISSN:
0036-8075
Electronic ISSN:
1095-9203
Topics:
Biology
,
Chemistry and Pharmacology
,
Computer Science
,
Medicine
,
Natural Sciences in General
,
Physics
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