Topography of carbon fibre surfaces |
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| Affiliation: | 1. Department of Chemistry, Payame Noor University, Iran;2. Department of Chemistry, Faculty of Science, University of Qom, Qom, Iran;1. Institute of Thermal Energy Engineering, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China;2. Shanghai Synchrotron Radiation Facility, Zhangjiang Lab, Shanghai Advanced Research Institute, Chinese Academy of Science, Shanghai, 201204, China |
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| Abstract: | Scanning tunnelling microscopy (stm) has been used to study topographic features on carbon fibre surfaces. Operating at a resolution of several nanometres, stm has shown a systematic change in surface profile as a function of oxidative fibre surface treatment. The surface of the polyacrylonitrile-based carbon fibre can be seen to consist of graphitic platelets of dimensions 30 × 20 × 100 nm. The platelets protrude from, rather than lie parallel to, the fibre surface. Maximum exposure of the edge of the platelets occurs at a level of treatment known to give high chemical activity and peak interfacial shear strength. Superimposed on the platelets are slit-like pores lying transverse to the fibre longitudinal axis. At high levels of treatment average surface roughness increases dramatically, coinciding with a decline in interface bond strength. |
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