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International Journal of Thermophysics

, Volume 34, Issue 12, pp 2371–2384 | Cite as

Prediction of Thermal Conductivity of Aluminum Nanocluster-Filled Mesoporous Silica (Al/MCM-41)

  • Congliang Huang
  • Yanhui Feng
  • Xinxin Zhang
  • Jing Li
  • Liu Cui
  • Ge Wang
  • Mu Yang
Article

Abstract

MCM-41 consists of a hexagonal array of long, unconnected cylindrical pores with diameters that can be tailored within the range 1.6 nm to 10 nm. As a porous silica nanomaterial, MCM-41 is a promising porous substrate for mesoporous composites with extremely high or low thermal conductivity. In this article, the structural unit of MCM-41 was established first and an equilibrium molecular dynamics simulation was performed to determine the shell thermal conductivity of MCM-41. Then, based on one-dimensional (1D) heat transfer analysis, a mathematical expression for the effective thermal conductivity (ETC) of Al nanocluster-filled mesoporous MCM-41 (Al/MCM-41) was obtained. The effects of porosity and the filling ratio of nanoclusters in the mesochannels were further investigated. As the porosity is greater than 75 %, the ETC of only-air-filling mesoporous MCM-41 in all directions tends to approach the thermal conductivity of air. It seems that Al nanoclusters have negligible effects on the ETC of the composite, except that mesochannels are almost completely filled with Al nanowires.

Keywords

Effective thermal conductivity Mesochannel Mesoporous composite Molecular dynamics Nanocluster Porous silica 

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Copyright information

© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  • Congliang Huang
    • 1
  • Yanhui Feng
    • 1
  • Xinxin Zhang
    • 1
  • Jing Li
    • 1
  • Liu Cui
    • 1
  • Ge Wang
    • 2
  • Mu Yang
    • 2
  1. 1.Department of Thermal EngineeringUniversity of Science and Technology BeijingBeijingChina
  2. 2.School of Materials Science and EngineeringUniversity of Science and Technology BeijingBeijingChina

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