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Ultralow Thermal Conductivity and Mechanical Resilience of Architected Nanolattices

Dou, Nicholas G. and Jagt, Robert A. and Portela, Carlos M. and Greer, Julia R. and Minnich, Austin J. (2018) Ultralow Thermal Conductivity and Mechanical Resilience of Architected Nanolattices. Nano Letters, 18 (8). pp. 4755-4761. ISSN 1530-6984.

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Creating materials that simultaneously possess ultralow thermal conductivity, high stiffness, and damage tolerance is challenging because thermal and mechanical properties are coupled in most fully dense and porous solids. Nanolattices can fill this void in the property space because of their hierarchical design and nanoscale features. We report that nanolattices composed of 24- to 182-nm-thick hollow alumina beams in the octet-truss architecture achieved thermal conductivities as low as 2 mW m^(–1) K^(–1) at room temperature while maintaining specific stiffnesses of 0.3 to 3 MPa kg^(–1) m^3 and the ability to recover from large deformations. These nanoarchitected materials possess the same ultralow thermal conductivities as aerogels while attaining specific elastic moduli that are nearly 2 orders of magnitude higher. Our work demonstrates a general route to realizing multifunctional materials that occupy previously unreachable regions within the material property space.

Item Type:Article
Related URLs:
URLURL TypeDescription Information
Dou, Nicholas G.0000-0001-8199-5588
Portela, Carlos M.0000-0002-2649-4235
Greer, Julia R.0000-0002-9675-1508
Minnich, Austin J.0000-0002-9671-9540
Additional Information:© 2018 American Chemical Society. Received: March 23, 2018; Revised: July 3, 2018; Published: July 19, 2018. This work was supported by the Air Force Office of Scientific Research (AFOSR) Multifunctional Materials program under grant no. FA9550-14-1-0266. J.R.G. acknowledges financial support from the Department of Defense (DoD) through the Vannevar Bush Faculty Fellowship, and C.M.P. acknowledges support from the Office of Naval Research (ONR) through grant no. N00014-16-1-2431. The authors thank Lucas R. Meza for useful discussions and fabrication assistance, the Kavli Nanoscience Institute at Caltech for providing clean room facilities and staff support, and Prof. Nathan S. Lewis for access to additional fabrication equipment. Author Contributions: N.G.D. built the 3ω experiment, conducted the thermal measurements, and developed the thermal model. R.A.J. fabricated samples and assisted with thermal measurements. C.M.P. performed the mechanical measurements. J.R.G. and A.J.M. provided technical guidance and supervision. All authors contributed to writing the paper. The authors declare no competing financial interest.
Group:Kavli Nanoscience Institute
Funding AgencyGrant Number
Air Force Office of Scientific Research (AFOSR)FA9550-14-1-0266
Vannever Bush Faculty FellowshipUNSPECIFIED
Office of Naval Research (ONR)N00014-16-1-2431
National Security Science and Engineering Faculty FellowshipUNSPECIFIED
Subject Keywords:Multifunctional materials, octet-truss, 3ω, phonon transport, stiffness, recoverability
Issue or Number:8
Record Number:CaltechAUTHORS:20180719-105749681
Persistent URL:
Official Citation:Ultralow Thermal Conductivity and Mechanical Resilience of Architected Nanolattices Nicholas G. Dou, Robert A. Jagt, Carlos M. Portela, Julia R. Greer, and Austin J. Minnich Nano Letters 2018 18 (8), 4755-4761 DOI: 10.1021/acs.nanolett.8b01191
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:87995
Deposited By: Tony Diaz
Deposited On:19 Jul 2018 18:07
Last Modified:03 Oct 2019 20:01

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