A nontoxic reversible thermochromic binary system via pi-pi stacking of sulfonephthaleins
Bingxin Liu, Hadi Ranji-Burachaloo, Paul A Gurr, Eirini Goudeli, Greg G Qiao
Journal of Materials Chemistry C | Royal Society of Chemistry | Published : 2019
The mechanisms of thermochromic materials are mostly based on Bragg reflection, surface plasmon absorption, molecular structure changes, conformational stretching or aggregation. Here, a simple class of dye–solvent binary systems with clear and reversible thermochromism around ambient temperatures is reported with an alternative mechanism. This system comprises commercially available sulfonephthaleins dissolved in liquid linear chain esters, acids or alcohols, which demonstrate colour changes at different temperatures when the solvents transition from solid to liquid states. The colour changing mechanism is based on π–π stacked aggregation or disaggregation of the sulfonephthalein dyes. Cell..View full abstract
Awarded by Australian Research Council (ARC), The University of Melbourne and Mondelez Australia
We thank the Australian Research Council (ARC), The University of Melbourne and Mondelez Australia for providing funding through Industrial Transformation Research Hub (ITRH, Project ID: IH120100053). Special thanks to Jiaxi Zhang, Chuan He and Shilin Yu for their assistance.