| ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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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 |
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 |
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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.
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Received: 29 August 2012
Revised: 23 October 2012
Accepted manuscript online:
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PACS:
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44.30.+v
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(Heat flow in porous media)
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61.43.Gt
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(Powders, porous materials)
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| Fund: 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). |
Corresponding Authors:
Feng Yan-Hui
E-mail: yhfeng@me.ustb.edu.cn
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Cite this article:
Huang Cong-Liang (黄丛亮), Feng Yan-Hui (冯妍卉), Zhang Xin-Xin (张欣欣), Li Jing (李静), Wang Ge (王戈) Thermal conductivity of a kind of mesoporous silica SBA-15 2013 Chin. Phys. B 22 064401
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