Citation:
LI Guo-Xian, WANG Tao, HE Jian-Ping, ZHOU Jian-Hua, XUE Hai-Rong, HU Yuan-Yuan. Synthesis and Infrared Emissivity of Ordered Mesoporous C-Al2O3-TiO2 Nanocomposites with a Dual Pore System[J]. Acta Physico-Chimica Sinica,
;2011, 27(01): 248-254.
doi:
10.3866/PKU.WHXB20110131
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C-Al2O3-TiO2 nanocomposites with a dual pore system were synthesized via the sol-gel tri-constituent co-assembly process using an amphiphilic triblock copolymer F127 (PEO106PPO70PEO106, MW=12600) as a template, aluminum isopropoxide and tetrabutyl titanate as metallic sources and resol as an organic precursor. X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), and nitrogen adsorption/desorption were used to characterize the structures of these nanocomposites. The results show that the nanocomposite with a Al/Ti molar ratio of 1:10 has ordered mesoporous structures with a dual system of 3.9 and 6.5 nm, a high specific surface area of 259 m2·g-1 and a pore volume of 0.37 cm3·g-1. Low infrared emissivity coatings were obtained using the ethylenepropylene- diene monomer (EPDM) as an adhesive and the ordered mesoporous C-Al2O3-TiO2 nanocomposites as a filling. As the Al/Ti molar ratio and coat thickness changed the infrared emissivities changed from 0.450 to 0.617.
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