中国物理B ›› 2013, Vol. 22 ›› Issue (6): 64401-064401.doi: 10.1088/1674-1056/22/6/064401

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇    下一篇

Thermal conductivity of a kind of mesoporous silica SBA-15

黄丛亮a, 冯妍卉a, 张欣欣a, 李静a, 王戈b   

  1. a School of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083, China;
    b School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
  • 收稿日期:2012-08-29 修回日期:2012-10-23 出版日期:2013-05-01 发布日期:2013-05-01
  • 基金资助:
    Project supported by the National Basic Research Program of China (973 Program) (Grant No. 2012CB720404)，the National Natural Science Foundation of China (Grant No. 50836001), the FOK Ying Tong Education Foundation, China (Grant No. 121055), and the Fundamental Research Funds for the Central Universities, China (Grant Nos. FRF-AS-12-002 and FRF-TP-11-001B).

Thermal conductivity of a kind of mesoporous silica SBA-15

Huang Cong-Liang (黄丛亮)a, Feng Yan-Hui (冯妍卉)a, Zhang Xin-Xin (张欣欣)a, Li Jing (李静)a, Wang Ge (王戈)b   

  1. a School of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083, China;
    b School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
  • Received:2012-08-29 Revised:2012-10-23 Online:2013-05-01 Published:2013-05-01
  • Contact: Feng Yan-Hui E-mail:yhfeng@me.ustb.edu.cn
  • Supported by:
    Project supported by the National Basic Research Program of China (973 Program) (Grant No. 2012CB720404)，the National Natural Science Foundation of China (Grant No. 50836001), the FOK Ying Tong Education Foundation, China (Grant No. 121055), and the Fundamental Research Funds for the Central Universities, China (Grant Nos. FRF-AS-12-002 and FRF-TP-11-001B).

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摘要： Mesoporous silica SBA-15 consists of uniform hexagonal, unconnected cylindrical channels with diameters that can be tuned within a range of 1.5 nm-30 nm, and is thought to have a special thermal conductivity. The theoretical investigation of the shell thermal conductivity of the mesoporous silica is performed in the relaxation time approximation in this paper. And an available one-dimensional heat transfer model is used to predict the effective thermal conductivity (ETC) of the mesoporous silica. The experimental result of the ETC is also presented for comparison. The shell thermal conductivity of the mesoporous silica decreases with mesochannel radius increasing or wall thickness decreasing, but does not strictly decrease with porosity increasing. The thermal radiation possibly plays a primary role in heat transfer at the large porosity scale. The predicted ETC of SBA-15 with only conduction considered is quite low at the large porosity, even lower than the thermal conductivity of the silica aerogels. To realize it, doping carbon or other matters which can strongly absorb infrared light into SBA-15 is a possible way.

关键词: mesoporous silica, thermal conductivity, SBA-15

Abstract: Mesoporous silica SBA-15 consists of uniform hexagonal, unconnected cylindrical channels with diameters that can be tuned within a range of 1.5 nm-30 nm, and is thought to have a special thermal conductivity. The theoretical investigation of the shell thermal conductivity of the mesoporous silica is performed in the relaxation time approximation in this paper. And an available one-dimensional heat transfer model is used to predict the effective thermal conductivity (ETC) of the mesoporous silica. The experimental result of the ETC is also presented for comparison. The shell thermal conductivity of the mesoporous silica decreases with mesochannel radius increasing or wall thickness decreasing, but does not strictly decrease with porosity increasing. The thermal radiation possibly plays a primary role in heat transfer at the large porosity scale. The predicted ETC of SBA-15 with only conduction considered is quite low at the large porosity, even lower than the thermal conductivity of the silica aerogels. To realize it, doping carbon or other matters which can strongly absorb infrared light into SBA-15 is a possible way.

Key words: mesoporous silica, thermal conductivity, SBA-15

中图分类号:  (Heat flow in porous media)

  • 44.30.+v
61.43.Gt (Powders, porous materials)