Ultralow Thermal Conductivity and Mechanical Resilience of Architected Nanolattices

Nicholas G. Dou, Robert A. Jagt, Carlos M. Portela, Julia R. Greer, Austin J. Minnich*

*Corresponding author for this work

    Research output: Contribution to journalArticleAcademicpeer-review

    23 Citations (Scopus)

    Abstract

    Creating matenals 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 matenals 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.

    Original languageEnglish
    Pages (from-to)4755-4761
    Number of pages7
    JournalNano Letters
    Volume18
    Issue number8
    DOIs
    Publication statusPublished - Aug-2018

    Keywords

    • Multifunctional materials
    • octet-truss
    • 3 omega
    • phonon transport
    • stiffness
    • recoverability
    • SILICA AEROGELS
    • CERAMIC NANOLATTICES
    • AMORPHOUS SOLIDS
    • PHOTONIC CRYSTAL
    • ORGANIC AEROGELS
    • 3-OMEGA METHOD
    • INVERSE OPALS
    • METAMATERIALS
    • FILMS
    • FABRICATION

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