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Journal of Porous Media
Facteur d'impact: 1.49 Facteur d'impact sur 5 ans: 1.159 SJR: 0.43 SNIP: 0.671 CiteScore™: 1.58

ISSN Imprimer: 1091-028X
ISSN En ligne: 1934-0508

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Journal of Porous Media

DOI: 10.1615/JPorMedia.2015012218
pages 941-947

THERMAL CONDUCTIVITY OF MONODISPERSE SILICA NANOSPHERES

Tao Gao
Norwegian University of Science and Technology (NTNU), Department of Civil and Transport Engineering, NO-7491 Trondheim, Norway
Bjørn Petter Jelle
Department of Civil and Transport Engineering, Norwegian University of Science and Technology (NTNU), NO-7491 Trondheim, Norway; Department of Materials and Structures, SINTEF Building and Infrastructure, NO-7465 Trondheim, Norway
Linn Ingunn C. Sandberg
Department of Civil and Transport Engineering, Norwegian University of Science and Technology (NTNU), NO-7491 Trondheim, Norway
Arild Gustavsen
Department of Architectural Design, History and Technology, Norwegian University of Science and Technology (NTNU), NO-7491 Trondheim, Norway

RÉSUMÉ

Monodisperse hollow silica nanospheres (HSNSs) with an outer diameter of ~300 nm and shell thickness of ~50 nm were prepared via a spontaneous dissolution−regrowth process of solid silica nanospheres (SSNSs) in NaBH4 aqueous solution. Experimental results indicated that the as-prepared HSNSs have a reduced thermal conductivity of about 0.0519±0.0007 W/(m·K), compared to ~0.082±0.005 W/(m·K) of the corresponding SSNSs. Moreover, a small shell thickness and a small inner pore diameter are, in general, required to achieve HSNSs with low thermal conductivities. A comparison between HSNSs and SSNSs enables calculating the intrinsic solid thermal conductivity of SSNSs, which is about 0.042 W/(m·K) for SSNSs with a mean diameter of 200 nm.


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