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SEM images of (A) Untreated cotton nonwoven fabric; (B) Nonwoven fabric with adsorbed copper chloride; (C) Nonwoven fabric with copper nanoparticles; (D) Nonwoven fabric following ascorbic acid treatment. All images are shown at a 1200× magnification and with a 20 µm scale bar. The white circle in (C) indicates an area with Cu particles embedded in the fiber cuticle. Arrows in (D) point to surface damage following treatment with ascorbic acid.
