Abonnement à la biblothèque: Guest
Page d'accueil IHTC DL Archives Responsables Réunions à venir Assemblée pour les conférences internationales sur le transfert de chaleur
International Heat Transfer Conference 13

ISBN Imprimer: 1-56700-226-9 (CD)
ISBN En ligne: 1-56700-225-0

STUDIES ON THERMOPHYSICAL PROPERTIES OF NANOSTRUCTURED MATERIALS

DOI: 10.1615/IHTC13.p30.310
page 20

Xinxin Zhang
School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China; Beijing Key Laboratory of Energy Saving and Emission Reduction for Metallurgical Industry, University of Science and Technology Beijing, Beijing 100083, China

Motoo Fujii
Institute of Advanced Material Study, Kyushu University, Kasuga, Fukuoka 816-8580, Japan

Résumé

The thermophysical properties of nanostructured materials are of importance for basic science as well as for technological applications. In this paper, we, at first, summarize the progress in the studies on the thermophysical properties of nanostructured materials, especially on the thermal conductivity of nanofilms and nanotubes, and then report our experimental studies on the thermal conductivity of suspended metallic nanofilms and individual nanotubes. The in-plane thermal conductivity of suspended metallic nanofilms has been measured with the direct current heating method. The measured results show that there exists a strong size effect on the thermal conductivity and the relation between the thermal conductivity and electrical conductivity of these metallic nanofilms is different from that of the bulk materials and does not follow the Wiedemann-Franz law. This result shows that the effect of the grain boundaries on the ability of electrons to transport heat is different from that to transport charge. The thermal conductivity of individual multiwalled carbon nanotubes has been measured by a novel method using a suspended sample-attached T-type nanosensor. The size effect of the different diameters on the thermal conductivity has been observed experimentally, which indicates that the interactions of phonons and electrons between walls affect the thermal conductivity. Our study has provided two simple and reliable methods to measure the thermal conductivity for any kind of individual nanofilms, nanofibers and nanotubes.

IHTC-13 Digital Library

Measurement of fluid temperature with an arrangement of three thermocouples FLOW BOILING OF A HIGHLY VISCOUS POLYMER SOLUTION