Fig. 5: Degradation properties of BTO-Gel.
From: Pyro-catalysis for tooth whitening via oral temperature fluctuation
a UV-Vis absorption spectra of Indigo Carmine solutions using BTO-Gel with a temperature fluctuation of +5 °C. b Cyclic stability of BTO-Gel degraded indigo solution. c–h Electron paramagnetic resonance spectra (EPR) of radical created by pyro-catalysis over different temperature range, different cycling times and the stability of radical creation. i The hydrogel shows excellent fluidity before curing even can be ejected from the syringe. Photographs of the stained tooth at original state, coated by BTO-gel and whited by BTO-gel at j slow and k fast heating rate. Slow rate designates heating-cooling time is 5 min, and fast designates heating-cooling time is 5 s. Scale bars are 1 cm. Source data are provided as a Source Data file.
