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Characterization of BPB-doped silica film. (a) Real-time reversibility of BPB-doped silica film in response to pH 7.4 and pH 5.0, alternatively, by measuring the absorbance at 595 nm.(b) Leaching study of BPB-doped silica films in pH 5.0 (black squares) and pH 7.4 (red dots). Inset: First three days of the leaching results for the BPB-doped silica film in pH 7.4.
