Preparation of Vapochromic and Halochromic Cellulosic Papers

This study investigates curcumin's vapochromic and halochromic properties, a natural dye derived from Curcuma longa, within a cellulose-based sensor system. The solubility of curcumin varies with solvent polarity, showing negligible solubility in both water and toluene, while exhibiting increased solubility in ethanol, ethyl acetate, and acetone, with ethanol identified as the most effective solvent for sensor fabrication. Spectroscopic analysis revealed pH-dependent color transitions from yellow (pH ۲-۴) to dark red (pH ۱۲). Curcumin-based ink demonstrated reversible color changes from yellow to red upon exposure to ammonia gas and an irreversible orange shift under boiling water vapor due to pH-dependent structural changes. These results demonstrate curcumin's potential for developing sustainable smart sensor technologies.

کلیدواژه ها:

curcumin ، vapochromic ، halochromic ، cellulose ، sustainable