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Transparent Al 2 O 3 , Al 2 O 3 -SiO 2 and SiO 2 sols were prepared via hydration of TEOS and Al(OC 3 H 7 ) 3 in distilled water and used to coat natural flake graphite. Graphite coated with these sols was dried at 120 o C for 12 h and heat-treated at 500 o C for 2 h to gel the sols. Water-wettability and oxidation...
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