Hydrosols of Titanium Dioxide Nanoparticles Containing Ti(IV) Peroxo Complexes: Modification, Optical Properties, Morphology, and Bleaching Kinetics

Abstract

— This paper reports the development and characterization of new inexpensive and safe light–time–temperature indicators for products of the pharmaceutical and food industries. For this purpose, we have prepared and characterized stable sols of titanium dioxide nanoparticles modified with titanium(IV) peroxo complexes. Electronic absorption spectroscopy, dynamic light scattering, scanning probe microscopy, and experimental kinetic data demonstrate that, varying synthesis conditions and, hence, the stability of the Ti(IV) peroxo complexes, one can ensure that their bleaching is symbatic with the degradation of a particular labeled object after the expiry date, and/or in the case of the required temperature conditions being not fulfilled, and/or during storage in the light. The most important result of this study is that we have found correlations between modification conditions of titanium peroxide sols, their optical properties, the morphology of films produced from them, and their bleaching kinetics under illumination.

Submerged Photosynthesis of TiO2-CuO Hetero-nanoparticles for the Solar Photo-electrolysis of Multiple Environmental Hazardous Substances

“…The product formed in this step, Ti(O2)2, is an unstable yellow intermediate [47,48]. After a short period, the liquid started to boil, accompanied by the release of a significant amount of heat, then the liquid began to change color from yellow to bluish green, suggesting the oxidation of Cu powder, and the bluish green product obtained in this step may be Cu2(OH)2CO3, as represented by the equation below [49]:…”

Tetraperoxotitanates for High Capacity Direct Air Capture of Carbon Dioxide

“…There have been a few reports of heteroleptic titanium peroxide complexes; [47][48][49] again, with almost no crystal structures. Yet titanium peroxide molecules and materials have noted applications in catalysis, [50][51][52] materials synthesis, [53][54][55][56] and nuclear waste treatment. 57 Moreover, Ti-peroxide bonding with its characteristic orange color is universally exploited for detection of formed peroxides in organic reagents.…”