Effect of density, phonon scattering and nanoporosity on the thermal conductivity of anisotropic cellulose nanocrystal foams

Abstract Anisotropic cellulose nanocrystal (CNC) foams with densities between 25 and 130 kg m−3 (CNC25 –CNC130) were prepared by directional ice-templating of aqueous dispersions. Estimates of the solid and gas conduction contributions to the thermal conductivity of the foams using a parallel resist...

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Autores principales:	Varvara Apostolopoulou-Kalkavoura, Pierre Munier, Lukasz Dlugozima, Veit-Lorenz Heuthe, Lennart Bergström
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/849c842d597a4e4da59177c03c037456
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spelling	oai:doaj.org-article:849c842d597a4e4da59177c03c0374562021-12-02T15:15:13ZEffect of density, phonon scattering and nanoporosity on the thermal conductivity of anisotropic cellulose nanocrystal foams10.1038/s41598-021-98048-y2045-2322https://doaj.org/article/849c842d597a4e4da59177c03c0374562021-09-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-98048-yhttps://doaj.org/toc/2045-2322Abstract Anisotropic cellulose nanocrystal (CNC) foams with densities between 25 and 130 kg m−3 (CNC25 –CNC130) were prepared by directional ice-templating of aqueous dispersions. Estimates of the solid and gas conduction contributions to the thermal conductivity of the foams using a parallel resistor model showed that the relatively small increase of the radial thermal conductivity with increasing foam density can be attributed to interfacial phonon scattering. The foam wall nanoporosity and, to a lesser extent, the orientation of the CNC particles and alignment of the columnar macropores, also influence the insulation performance of the foams. The insight on the importance of phonon scattering for the thermal insulation properties of nanocellulose foams provides useful guidelines for tailoring nanofibrillar foams for super-insulating applications.Varvara Apostolopoulou-KalkavouraPierre MunierLukasz DlugozimaVeit-Lorenz HeutheLennart BergströmNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-11 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Varvara Apostolopoulou-Kalkavoura Pierre Munier Lukasz Dlugozima Veit-Lorenz Heuthe Lennart Bergström Effect of density, phonon scattering and nanoporosity on the thermal conductivity of anisotropic cellulose nanocrystal foams
description	Abstract Anisotropic cellulose nanocrystal (CNC) foams with densities between 25 and 130 kg m−3 (CNC25 –CNC130) were prepared by directional ice-templating of aqueous dispersions. Estimates of the solid and gas conduction contributions to the thermal conductivity of the foams using a parallel resistor model showed that the relatively small increase of the radial thermal conductivity with increasing foam density can be attributed to interfacial phonon scattering. The foam wall nanoporosity and, to a lesser extent, the orientation of the CNC particles and alignment of the columnar macropores, also influence the insulation performance of the foams. The insight on the importance of phonon scattering for the thermal insulation properties of nanocellulose foams provides useful guidelines for tailoring nanofibrillar foams for super-insulating applications.
format	article
author	Varvara Apostolopoulou-Kalkavoura Pierre Munier Lukasz Dlugozima Veit-Lorenz Heuthe Lennart Bergström
author_facet	Varvara Apostolopoulou-Kalkavoura Pierre Munier Lukasz Dlugozima Veit-Lorenz Heuthe Lennart Bergström
author_sort	Varvara Apostolopoulou-Kalkavoura
title	Effect of density, phonon scattering and nanoporosity on the thermal conductivity of anisotropic cellulose nanocrystal foams
title_short	Effect of density, phonon scattering and nanoporosity on the thermal conductivity of anisotropic cellulose nanocrystal foams
title_full	Effect of density, phonon scattering and nanoporosity on the thermal conductivity of anisotropic cellulose nanocrystal foams
title_fullStr	Effect of density, phonon scattering and nanoporosity on the thermal conductivity of anisotropic cellulose nanocrystal foams
title_full_unstemmed	Effect of density, phonon scattering and nanoporosity on the thermal conductivity of anisotropic cellulose nanocrystal foams
title_sort	effect of density, phonon scattering and nanoporosity on the thermal conductivity of anisotropic cellulose nanocrystal foams
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/849c842d597a4e4da59177c03c037456
work_keys_str_mv	AT varvaraapostolopouloukalkavoura effectofdensityphononscatteringandnanoporosityonthethermalconductivityofanisotropiccellulosenanocrystalfoams AT pierremunier effectofdensityphononscatteringandnanoporosityonthethermalconductivityofanisotropiccellulosenanocrystalfoams AT lukaszdlugozima effectofdensityphononscatteringandnanoporosityonthethermalconductivityofanisotropiccellulosenanocrystalfoams AT veitlorenzheuthe effectofdensityphononscatteringandnanoporosityonthethermalconductivityofanisotropiccellulosenanocrystalfoams AT lennartbergstrom effectofdensityphononscatteringandnanoporosityonthethermalconductivityofanisotropiccellulosenanocrystalfoams
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Effect of density, phonon scattering and nanoporosity on the thermal conductivity of anisotropic cellulose nanocrystal foams

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