Hydrosols of Titanium Dioxide Nanoparticles Containing Ti(IV) Peroxo Complexes: Modification, Optical Properties, Morpho
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osols of Titanium Dioxide Nanoparticles Containing Ti(IV) Peroxo Complexes: Modification, Optical Properties, Morphology, and Bleaching Kinetics I. V. Yaminskya, b, c, A. I. Akhmetovab, c, V. N. Kur’yakovd, L. N. Obolenskayae, *, and N. V. Kotlyarovae a
Moscow State University, Moscow, 119991 Russia Belozersky Research Institute of Physicochemical Biology, Moscow State University, Moscow, 119234 Russia c Advanced Technologies Center, Moscow, 119311 Russia d Oil and Gas Research Institute, Russian Academy of Sciences, Moscow, 119333 Russia e State budget funded education institution Public School no. 2065, Moscow, 108811 Russia *e-mail: [email protected]
b
Received February 8, 2020; revised July 6, 2020; accepted July 7, 2020
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. Keywords: hydrosols, titanium dioxide, titanium(IV) peroxo complexes, scanning probe microscopy, electronic absorption spectroscopy DOI: 10.1134/S0020168520110175
INTRODUCTION At present, one topical issue is the ability to monitor (1) how storage conditions of pharmaceutical preparations and food products (especially such as fermented dairy food with probiotics) are fulfilled; (2) the completeness of thermal (steam or air) sterilization of medical tools, incubation apparatuses, etc.; and (3) the acidity of various aqueous media (including sera and others). Titanium peroxide nanofilms developed by us are suitable for repeated use for indication of all three of the above parameters. As shown in previous work, using a simple one-step synthesis from solvated titanyl sulfate and a hydrogen peroxide solution (in autothermal mode) one can obtain hydrosols of monodisperse titanium peroxo acid nanoparticles, capable of forming stable nanostructured films on a variety of surfaces (fibers of sterile gauze wipes, glass, mica, and others). Such films
are promising materials for producing a new class of light–time—temperature indicators, because they contain bright red titanium(IV) peroxo complexes, which slowly bleach (in a temperature-dependent process) when stored in the light. V
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