S.-H. Hong et al. Carbon 38(2000)805-815 Nds I b Nndst2i Nnldst2 Fig. 5. HR-SEM photographs of the skin area in the mesophase pitch-based as-spun fibers: spinning temperature (a)300,(b)310, and(c) onion-like texture. However, observation under very high magnification exhibits a round surface in the former two 如 rbon surface in the oxi fibers where spurs of graphene layers were arranged to follow the morphology of the top of the microdomain, 4.2. Development of mesoscopic texture suggesting that basal planes also cover the surfaces of both radial and random textures. STM of the graphitized surface Mesoscopic texture has been reported to develop during suggests the dominance of basal planes on the surface of the spinning, carbonization, and graphitization steps the carbon fiber [17]. The first layer of the surface must be [11, 12]. The mesophase pitch carries mesoscopic units of microscopically analyzed, since the surface may govern od-like microdomains which are arranged by the spinningS.-H. Hong et al. / Carbon 38 (2000) 805 –815 811 Fig. 5. HR-SEM photographs of the skin area in the mesophase pitch-based as-spun fibers: spinning temperature (a) 300, (b) 310, and (c) 3408C. onion-like texture. However, observation under very high the reactivity of carbon surface in the oxidative pretreat￾magnification exhibits a round surface in the former two ment of the carbon fiber as a composite filler. fibers where spurs of graphene layers were arranged to follow the morphology of the top of the microdomain, 4.2. Development of mesoscopic texture suggesting that basal planes also cover the surfaces of both radial and random textures. STM of the graphitized surface Mesoscopic texture has been reported to develop during suggests the dominance of basal planes on the surface of the spinning, carbonization, and graphitization steps the carbon fiber [17]. The first layer of the surface must be [11,12]. The mesophase pitch carries mesoscopic units of microscopically analyzed, since the surface may govern rod-like microdomains which are arranged by the spinning