3.2. X-Ray diffraction
These peaks are typical for cellulose (Johar et al., 2012). For gelatin hydrogels, only one diffraction peak was observed (2θ = 20°). This peak can be linked to the three helical structures in gelatin (Asma et al., 2014). This peak was lower and wider than the CNC peaks, showing that the degree of crystallinity of gelatin is less than that for a CNC.