✍ Scribed by Seong-Ho Yoon; Yozo Korai; Isao Mochia; Kiyoshi Yokogawa; Seiji Fukuyama; Masamitsu Yoshimura
No coin nor oath required. For personal study only.
Nano-scale structures of a mesophase pitch based carbon fiber were characterized using a high-resolution scanning electron microscope (HR-SEM) and a scanning tunneling microscope (STM). Fibril was found to be sectioned by a number of pleat units, being aligned parallel along the fiber axis. The periodical size, thickness and height of pleat unit was estimated as 30-60 nm, 20-30 nm and around 7 nm, respectively.
In a pleat, graphitic units of 30-60 nm long and 2-4 nm wide run principally perpendicular to the axis. The basal plane of graphite was observed at the largest magnification. Such a series of nano-structures should be related intimately to the performance of the fibers. The formation mechanism of such series of nano-structural units is discussed in relation to the nano-structure of the liquid crystal mesophase pitch and its deformation during the spinning.
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