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(A) pH Calibration curves (ionic strength 100 mM) for the sensor foils based on silica gel beads in D4® hydrogel and cross-linked poly(HEMA) beads in linear poly(HEMA), both carrying covalently linked PET rhodamine. pH1/2 is the pH at which half of the overall pH-dependent signal change is observed. (B) Photographic image of the poly(HEMA) sensor foils in acidic (pH 4) and basic (pH 9) buffer.
