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SEM images at the surface and in the cross-section of chitosan-based xerogels at different scales (in the 100–500 μm range): chitosan–Tween 80 (CHH/T80), CHH//T80 crosslinked with citrate (CHH/T80-Cit), CHH//T80 loaded with clove essential oil (CHH/T80-CEO), and CHH/T80-CEO crosslinked with citrate (CHH/T80-CEO-Cit).
