Journal
DYES AND PIGMENTS
Volume 108, Issue -, Pages 1-6Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.dyepig.2014.04.014
Keywords
Hydrogel; Alginate; Catechol; Pyrocatechol violet; pH; Sensor
Funding
- Korean Research Foundation - Korean Government [NRF-2013R1A1A2006459]
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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, the alginate-catechol hydrogel provided high mechanical strength and chemical stability without deformation over a wide range of pH values because of the internal cross-linking of the catechol groups. Furthermore, it conferred considerable adhesion strength to various substrates via the adhesive function of the catechol moiety. The usage of the hydrogel as a spreadable pH indicator was demonstrated on a variety of surfaces. Finally, the colorimetric hydrogel was implanted in a fluidic channel to function as a visible pH indicator. (C) 2014 Elsevier Ltd. All rights reserved.
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