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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-421-2

International Heat Transfer Conference 15
August, 10-15, 2014, Kyoto, Japan

Synthesis and Thermal Conductivity of Monodisperse Hollow Silica Nanospheres

Get access (open in a dialog) DOI: 10.1615/IHTC15.nmm.008885
pages 5639-5646

Аннотация

Monodisperse hollow silica nanospheres (HSNSs) with 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 ~ 0.0519 +/- 0.0007 W/(m·K), compared to ~ 0.082 +/-0.005 W/(m·K) of the corresponding SSNSs, from which the intrinsic solid thermal conductivity of individual SSNSs with a mean diameter of 200 nm can be calculated to be ~ 0.042 W/(m·K). Moreover, a small shell thickness and a small inner pore diameter are in general required to achieve HSNSs with low thermal conductivities.