Figure 3. Optical micrographs: surface views of a PVA coated bundle (A) and a PVA/HA coated bundle with R = 2.5 (B); cross-sections of a PVA coated bundle (C) and PVA/HA coated bundles with R = 0.4, 0.2 and 0.1 (D–F). Scale bar is 500µm.
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