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We prepared a pyrocatechol violet-titanium (IV) bis(ammonium lactato)dihydroxide (PV-TALH) complex that can be used as a colorimetric HF sensing dye. The titanium alkoxide, titanium (IV) bis(ammonium lactato)dihydroxide (TALH), easily formed a complex with pyrocatechol violet (PV) dye, which dissociated when exposed to HF and led to visible color change from dark blue to light yellow. The PV-TALH...
A pH-sensitive colorimetric hydrogel was prepared from a catechol-conjugated alginate hydrogel and a pyrocatechol violet dye. The alginate-catechol hydrogel functioned as a host matrix, holding the dye solution inside, while the entrapped pyrocatechol violet worked as a pH-indicating dye whose color changed reversibly by responding to external pH stimuli. Compared to the other commonly used hydrogels,...
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