Ultralow Thermal Conductivity and Mechanical Resilience of Architected Nanolattices

Nano Letters
Nicholas G DouAustin J Minnich

Abstract

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 m3 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.

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Citations

Sep 13, 2019·Nature·Xiaoxing XiaJulia R Greer
Oct 17, 2019·Nanoscale·Travis G NovakSeokwoo Jeon
Mar 7, 2020·Proceedings of the National Academy of Sciences of the United States of America·Carlos M PortelaDennis M Kochmann
Jan 13, 2021·Nanoscale·Yuan ChengGang Zhang
Oct 27, 2020·Advanced Science·Widianto P MoestopoCarlos M Portela
Jan 30, 2019·ACS Applied Materials & Interfaces·Tao WangGeorg K H Madsen

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