“…Zhang and Lee studied the effect of Al 2 O 3 /SiO 2 coating on improving water wettability of graphite flakes [6]. Also other researchers employed different coatings such as TiO 2 [7], SiC [3], SiO 2 [8], ZrO 2 [9] and Al 2 O 3 [4,10] in order to improve surface properties of graphite. In our previous work, MgAl 2 O 4 spinel coating prepared via sol-gel citrate process and its effect on water wettability and oxidation resistance of graphite were studied [11].…”