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a) Measurement results of surface zeta potentials of samples VO‐0, VO‐1, VO‐2, and VO‐3. b) Chemical valence states of V element before and after soaking in PBS for 1 and 14 days. c) Release profiles of vanadium ions from samples VO‐0, VO‐1, VO‐2, and VO‐3 within 14 days.
