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Tunable analog thermal material.

Abstract：

:Naturally-occurring thermal materials usually possess specific thermal conductivity (κ), forming a digital set of κ values. Emerging thermal metamaterials have been deployed to realize effective thermal conductivities unattainable in natural materials. However, the effective thermal conductivities of such mixing-based thermal metamaterials are still in digital fashion, i.e., the effective conductivity remains discrete and static. Here, we report an analog thermal material whose effective conductivity can be in-situ tuned from near-zero to near-infinity κ. The proof-of-concept scheme consists of a spinning core made of uncured polydimethylsiloxane (PDMS) and fixed bilayer rings made of silicone grease and steel. Thanks to the spinning PDMS and its induced convective effects, we can mold the heat flow robustly with continuously changing and anisotropic κ. Our work enables a single functional thermal material to meet the challenging demands of flexible thermal manipulation. It also provides platforms to investigate heat transfer in systems with moving components.

journal_name

Nat Commun

journal_title

Nature communications

authors

Xu G,Dong K,Li Y,Li H,Liu K,Li L,Wu J,Qiu CW

doi

10.1038/s41467-020-19909-0

subject

Has Abstract

pub_date

2020-11-27 00:00:00

pages

6028

issue

1

issn

2041-1723

pii

10.1038/s41467-020-19909-0

journal_volume

11

pub_type

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