Abstract
The surfaces of Hercules Type A PAN-based graphite fibers both treated (AS) and untreated (AU) were investigated using thermal desorption, krypton adsorption thermodynamics and ISS + SIMS techniques. Surface treatment enhanced the surface energetics of these fibers on 30% of the surface over the untreated fiber. In addition, the surface treatment increases the affinity of the fiber surface for adsorbed material by a factor of 8 over the untreated fiber surface. Surface spectroscopy has shown that one surface constituent is sodium which is present in very large concentration on these fibers.
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