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Thermal conductivity of amorphous silica nanoparticles

Gao, Tao; Jelle, Bjørn Petter
Journal article, Peer reviewed
Published version
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Gao (Locked)
URI
http://hdl.handle.net/11250/2617073
Date
2019
Metadata
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  • Institutt for bygg- og miljøteknikk [2816]
  • Publikasjoner fra CRIStin - NTNU [19946]
Original version
Journal of nanoparticle research. 2019, 21 .   10.1007/s11051-019-4556-8
Abstract
Understanding the heat transfer through confined systems at nanometer scale is of both scientific interest and technical importance. We report in this paper, a case study on the thermal conductivity of amorphous silica nanoparticles. It is found that the solid-state thermal conductivity of amorphous silica nanoparticles is size-dependent and can be quantitatively calculated by using a phenomenological theory. The observed size effect on thermal conductivity of silica nanoparticles is however not significant, mostly due to the very small phonon mean free path of amorphous silica, l0 = 0.59 nm. It is also found that the phonon-defect scattering at the nanoparticle surfaces has a predominate effect on the involved heat transfer process. The calculated thermal conductivity of 5-nm silica nanoparticles is about 0.539 W/(mK).
Publisher
Springer Verlag
Journal
Journal of nanoparticle research

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