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The swelling rate curves of CaAlg hydrogel membranes prepared with different NaAlg concentrations. Copper wire diameter: 0.3 mm (NaAlg concentrations: dark red line: 1.5 wt.%; red line: 2.0 wt.%; blue line: 2.5 wt.%; purple line: 3.0 wt.%; green black: 3.5 wt.%).
