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Silica-silicon composites for near-infrared reflection: A comprehensive computational and experimental study

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journal contribution
posted on 2021-10-08, 08:56 authored by Kevin Conley, Shima Moosakhani, Vaibhav Thakore, Yanling Ge, Joonas Lehtonen, Mikko Karttunen, Simo-Pekka Hannula, Tapio Ala-NissilaTapio Ala-Nissila
Compact layers containing embedded semiconductor particles consolidated using pulsed electric current sintering exhibit intense, broadband near-infrared reflectance. The composites consolidated from nano- or micro-silica powder have a different porous microstructure which causes scattering at the air-matrix interface and larger reflectance primarily in the visible region. The 3 mm thick composite compacts reflect up to 72% of the incident radiation in the near-infrared region with a semiconductor microinclusion volume fraction of 1% which closely matches predictions from multiscale Monte Carlo modeling and Kubelka-Munk theory. Further, the calculated spectra predict a reddish tan compact with improved reflectance can be obtained by decreasing the average particle size or broadening the standard deviation. The high reflectance is achieved with minimal dissipative losses and facile manufacturing, and the composites described herein are well-suited to control the radiative transfer of heat in devices at high temperature and under harsh conditions.

Funding

Academy of Finland project 314488 and QTF Centre of Excellence program (312298, KC and TAN)

History

School

  • Science

Department

  • Mathematical Sciences

Published in

Ceramics International

Volume

47

Issue

12

Pages

16833 - 16840

Publisher

Elsevier BV

Version

  • VoR (Version of Record)

Rights holder

© The Authors

Publisher statement

This is an Open Access Article. It is published by Elsevier under the Creative Commons Attribution 4.0 International Licence (CC BY 4.0). Full details of this licence are available at: https://creativecommons.org/licenses/by/4.0/

Acceptance date

2021-02-27

Publication date

2021-03-04

Copyright date

2021

ISSN

0272-8842

eISSN

1873-3956

Language

  • en

Depositor

Prof Tapio Ala-Nissila. Deposit date: 7 October 2021

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