A thin layer of an acidic aqueous slurry of crystal violet dye and Degussa P-25 TiO<sub>2</sub> exhibits many colors as it dries. While most of the colors can be understood as part of the acid-base characteristics of the dye, a transient pink area is observed that cannot be explained by acid-base chemistry. Ultraviolet-visible spectroscopy did not provide definitive identification of the pink species. Our study focused on measuring time-dependent Raman spectra of an acidic crystal violet slurry as it dries on a glass slide, to investigate the identity of the pink species and characterize the other species on the surface. Rapid changes in Raman shift were seen as the pink area appeared and disappeared on the slide.

Time-dependent Raman spectroscopy of acidic Crystal Violet on TiO<sub>2</sub> nanoparticles

2019 Spring National Meeting

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Time-dependent Raman spectroscopy of acidic Crystal Violet on TiO2 nanoparticles

Time-dependent Raman spectroscopy of acidic Crystal Violet on TiO₂ nanoparticles