Acta Phys. -Chim. Sin. ›› 2009, Vol. 25 ›› Issue (10): 2155-2160.doi: 10.3866/PKU.WHXB20091008

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Syntheses and Infrared Emissivities of Ordered Mesoporous C-Al2O3 Nanocomposites

WANG Tao, ZHOU Jian-Hua, WANG Dao-Jun, SUN Dun, DI Zhi-Yong, HE Jian-Ping   

  1. College of Material Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, P. R. China
  • Received:2009-05-06 Revised:2009-06-22 Published:2009-09-29
  • Contact: HE Jian-Ping


C-Al2O3 nanocomposites were synthesized via the sol-gel tri-constituent co-assembly process using an amphiphilic triblock copolymer F127 (PEO106PPO70PEO106, MW=12600) as a template, aluminum iso-propoxide as an inorganic source, and resol as an organic precursor. X-ray diffraction (XRD), transmission electron microscopy (TEM), and nitrogen adsorption/desorption were used to characterize the structures and properties. The results showed that the nanocomposite MC5A5 has ordered mesoporous structures with a high specific surface area of 175 m2·g-1 and a pore volume of 0.22 cm3·g-1. Low infrared emissivity coatings were obtained using the ethylene-propylene-diene monomer (EPDM) as an adhesive and the ordered mesoporous C-Al2O3 nanocomposites as a filling. As the mass percentage of Al2O3 was increased from 30% to 70%, the infrared emissivity decreased from 0.575 to 0.456. Al2O3 can effectively reduce the infrared emissivities of nanocomposites. Ordered mesoporous C-Al2O3 nanocomposites are thus promising for application in martial equipment.

Key words: Ordered mesoporou structure, C-Al2O3 nanocomposite, Ethylene-propylene-diene monomer, Infrared emissivity