International Scholarly Research Notices

Research Article

Sol-Gel Thin Films Immobilized with Bromocresol Purple pH-Sensitive Indicator in Presence of Surfactants

Figure 5

Absorption spectra of free BCP at different pH values (1–14): (a) pH 1–5, 𝜆 m a x = 433 nm; (b) pH 5.5–14, 𝜆 m a x = 590 nm.
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