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Optical micrographs of (a) wet PVA/Ag/Ca-alginate fibre (scale bar: 500 µm); (b) dry PVA/Ag/Ca-alginate fibre (scale bar: 500 µm); (c) wet PVA/Ag/Ca-alginate microfibre (scale bar: 500 µm); (d) dry PVA/Ag/Ca-alginate microfibre (scale bar: 200 µm).
