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XRD of alginate, collagen, cellulose powder and freeze‐dried hydrogel cross‐linked for 10 minutes with 0·05 M CaCl2 (hydrogel‐0·05) and 1 M CaCl2 (hydrogel‐1). Hydrogel‐1 confirmed the presence of sodium chloride and an excessive amount of calcium (based on EDS results).
