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SEM images of the (a) CBM/CMC, (b) CBM/CMC/EEO, (c) CBM/CMC/GEO and (d) CBM/CMC/CEO hydrogels. CBM Carbomer 940, CMC Carboxymethyl chitosan, EEO Eucalyptus essential oil, GEO ginger essential oil, CEO cumin essential oil, SEM scanning electron microscope
