Preparation and porous control of amorphous carbons by co-defluorination of perfluorooctane and octafluorotoluene in vapor phases at 423 K |
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Authors: | Osamu Tanaike Hitoshi Kawabuchi Hiroaki Hatori Ryohei Asakura Naoya Miyajima Yoshio Yamada |
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Institution: | aEnergy Technology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba West, 16-1 Onogawa, Tsukuba, Ibaraki 305-8561, Japan;bUniversity of Fukui, Bunkyo 3-9-1, Fukui-shi 910-8507, Japan;cFukuoka Industrial Technology Center, Interior Design Research Institute, 405-3 Agemaki, Okawa, Fukuoka 831-0031, Japan;dUniversity of Yamanashi, Takeda 4-3-11, Kofu, Yamanashi 400-8511, Japan |
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Abstract: | Two types of perfluorocarbon compounds, aliphatic perfluorooctane and aromatic octafluorotoluene, were co-defluorinated using sodium metal, and amorphous carbons were deposited from the vapor phase at very low temperature, 423 K. The products showed morphologies composed of fibrous, platelet, and spherical forms, which were dependent on the mixing ratio of the two. The BET surface areas also correlated well with the ratio of the starting mixtures, indicating that the surface area could be adjusted by changing the mixing ratio of these two compounds. However, when the carbonaceous product was further annealed in situ at 573 or 673 K, the porosities also modified. First the porosity decreased at 573 K, then increased greatly at 673 K, where radical interaction to shrink the pores and crystal growth of template fluoride occurred at 573 K and 673 K, respectively. |
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Keywords: | Porosity Nanoparticles Phases and equilibria Processing Carbon-based and nanotubes Adsorption |
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