Synthesis and characterization of different binary and ternary phase mixtures of mesoporous nanocrystalline titanium dioxide

Ermokhina, N. I.; Shvalagin, V. V.; Romanovska, N. I.; Manoryk, P. A.; Barakov, Roman; Kompanets, M. O.; Sapsay, V.I.; Klymchuk, D. O.; Puziy, Alexander M.

doi:10.1007/s42452-021-04474-y

Cited by 6 publications

(3 citation statements)

References 76 publications

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“…In recent years bulk-nanostructuring using the cryomilling method got wide attention among scholars because of the energy-efficient nature compared to other NC production routes. Liquid phase NC materials synthesis includes processes, such as rapid solidification [58][59][60][61], electrodeposition [62][63][64], chemical precipitation [65,66], and sol-gel technique [67][68][69]. NC material synthesis in gaseous form is achieved by inert gas condensation [70][71][72], vapor deposition/sputtering [73][74][75][76][77], and plasma processing [78].…”

Section: Rapid Solidificationmentioning

confidence: 99%

Nanocrystalline Materials: Synthesis, Characterization, Properties, and Applications

et al. 2021

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Nanostructuring is a commonly employed method of obtaining superior mechanical properties in metals and alloys. Compared to conventional polycrystalline counterparts, nanostructuring can provide remarkable improvements in yield strength, toughness, fatigue life, corrosion resistance, and hardness, which is attributed to the nano grain size. In this review paper, the current state-of-the-art of synthesis methods of nanocrystalline (NC) materials such as rapid solidification, chemical precipitation, chemical vapor deposition, and mechanical alloying, including high-energy ball milling (HEBM) and cryomilling was elucidated. More specifically, the effect of various process parameters on mechanical properties and microstructural features were explained for a broad range of engineering materials. This study also explains the mechanism of grain strengthening using the Hall-Petch relation and illustrates the effects of post-processing on the grain size and subsequently their properties. This review also reports the applications, challenges, and future scope for the NC materials.

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Section: Rapid Solidificationmentioning

confidence: 99%

Nanocrystalline Materials: Synthesis, Characterization, Properties, and Applications

et al. 2021

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“…Aft er oxidation, the pathogens turn into stable harmless inorganic compounds, such as water, carbon dioxide, etc. Due to their unique properties, the use of titanium dioxide nanoparticles (TiO 2 NPs) as disinfectants is widely researched [4][5][6]. For future commercial use, it is important that TiO 2 photocatalysis not require the addition of chemicals and not generate hazardous waste [2].…”

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confidence: 99%

Photodynamic Treatment of Titanium Dioxide Nanoparticles is a Convenient Method of Adenoviral Inactivation

et al. 2023

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Today, the search for safe ways to inactivate pathogens is becoming especially relevant in connection with the coronavirus pandemic. Standard methods using chlorides and ultraviolet irradiation have disadvantages related to toxicity and low efficiency. Photodynamic inactivation involving nanoparticles is already used to disinfect water and air from microorganisms and enveloped viruses such as human herpes simplex virus, vesicular stomatitis virus, human immunodeficiency virus, and hepatitis B and C viruses. The aim of this work was to evaluate the possibility of the inactivation of human adenovirus type 5 in an organic medium using titanium dioxide irradiated with ultraviolet light. Methods. The nanosized titanium dioxide material was obtained by the thermal decomposition of a suspension of hydrated titanium dioxide TiO(OH)2 (metatitanic acid). The analysis of the morphology of the TiO2 nanopowder was carried out using electron scanning microscopy (SEM), which showed that TiO2 nanopowder contains soft aggregates of nanoparticles mostly 20‒30 nm in size. Cytotoxicity, virulicidal and antiviral action of titanium dioxide were determined by standard methods using (3-(4,5-dimathylthiazol-2-yl)-2,5-dipheniltetrazolium bromide (MTT). The titanium dioxide suspension was irradiated at a distance of 20 cm from 1 to 30 min with a bactericidal UV lamp (OBB15P, BactoSfera, Poland (254 nm)). The concentration of nanoparticles for irradiation was 1.0 mg/mL. Adenovirus suspension with titer 6.0 log10 TCID50 /mL was added to the nanoparticles immediately after irradiation. The titer of virus synthesized in the presence of titanium dioxide was determined by the end of the virus dilution, which causes 50% of the cytopathic effect of the virus on cells. All studies were performed in three replicates; the number of parallel determinations was three. Results. A dose-dependent effect of titanium dioxide nanoparticles on the viability of Hep-2 cells was revealed. At the NPs concentration of 1 mg/mL, quite a low cell viability was observed (32—39%), with a decrease in concentration to 0.1 and 0.01 mg/mL, the NPs were less toxic (cell viability was in the range of 62—90%). The TiO2 NPs dissolved in glycerin-water had no virulicidal effect, as the virus titer was similar to the control values. Instead, NPs dissolved in propanediol-ethanol reduced the infectious titer of the virus by 6.0 log10, which indicates their high virulicidal effect. The absence of an antiviral effect was shown when NPs were added to infected cells. A decrease in the virus titer by 4.5‒5.0 log10 was recorded uponitsinteracting with irradiated NPs for 1‒30 min. The effect persisted for 3 h after exposure to NPs. Conclusions. The cytotoxic, virulicidal, and antiviral effects of optically active TiO2 nanoparticles were determined in optimal conditions. Regardless of the solvent, NPs had low toxicity at a concentration of 0.1 mg/mL. The TiO2 NPs dissolved in glycerin-water had no virulicidal effect; but dissolved in propanediol-ethanol reduced the infectious titer of the virus by 6.0 log10, which indicates its high virulicidal effect. NPs in a propanediol-ethanol solution, irradiated with UV for 1‒30 min, completely inhibited adenovirus reproduction. NPs in a glycine-water solution reduced the virus titer by 0.5 log10. The control with NPs without irradiation slightly reduced the virus titer (by 0.45 log10). The ability of NPs to completely inactivate adenovirus was maintained for 3 h. It was shown for the first time that the non-enveloped HAdV5 virus could be efficiently inactivated by UV-induced TiO2 photocatalysis.

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“…Раніше нами було запропоновано підходи до отримання meso-nc-TiO 2 (анатаз та різні фазові композиції) золь-гель-методом із використанням тетрабутоксиду титану (ТВОТ) у бутанолі (ВuОН) за присутності як темплату дибензо-18-краун-6 (DВ18С6) без/або у поєднанні з гідротермальним ФІЗИЧНА ХІМІЯ обробленням при 175 o C проміжного продукту та подальшим прожарюванням при 500 o C [58][59][60][61]. Було показано, що введення в реакційну суміш невеликих добавок солі лантану та поверхнево активної речовини (ПАР), наприклад, додецилметилетиламонію броміду (DDMEABr) або пальмітинової кислоти (Palm), значно впливає на ступінь кристалізації, текстуру і морфологію отриманих зразків TiO 2 .…”

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PHOTOCATALYTIC ACTIVITY OF MESOPOROUS TiO2 (ANATAS) IN THE REACTION OF HYDROGEN RELEASE FROM AQUEOUS-ETHANOLIC MIXTURE

et al. 2022

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Samples of mesoporous nanocrystalline titanium dioxide (anatase with a crystallite size of about 10 nm) were obtained by a modified sol-gel method in the presence of a template of dibenzo-18-crown-6 and small additives of surfactant (dodecylmethylethylammonium bromide) or ions of lanthanum (III) in butyl alcohol in combination with hydrothermal treatment at 175 °C for 24 hours followed by calcination in air at 500 °C for 4 hours. The photocatalytic activity of the obtained TiO2 samples was investigated in a model reaction of the photocatalytic release of H2 from an aqueous-ethanol mixture. It was found that in all cases the use of hydrothermal treatment significantly increases the photoactivity of the obtained sample, which in some cases is more than 3-4 times higher than the corresponding characteristic for commercial photocatalyst Evonik P25. The key effect of hydrothermal treatment on the increase of photoactivity of the samples is probably the consequence of a drastic increase in the treated samples of pore volume and diameter, as well as a decrease in the size of anatase crystallites. These changes (along with a significant increase in the specific surface area) are greater for samples obtained in the presence of La3+ ions. It is shown that samples of TiO2 microspheres obtained at the same concentrations of reagents in the reaction mixture show slightly higher photocatalytic activity than the corresponding lanthanum-stabilized samples of mesoporous TiO2 powders (micrometer-scale particles are not formed in the presence of lanthanum (III) ions). However, with an increasing concentration of reagents in the reaction mixture, the photocatalytic activity has the sample containing lanthanum. Probably, this can be explained by the high textural characteristics of the TiO2 sample in combination with the peculiarities of its morphology - the formation of secondary nanoparticles of agglomerated formations and the influence of La3+ ions. It is worth noting that the photocatalytic activity of TiO2 samples prepared in the presence of La3+ ions reduces as their specific surface area decreases.

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Synthesis and characterization of different binary and ternary phase mixtures of mesoporous nanocrystalline titanium dioxide

Cited by 6 publications

References 76 publications

Nanocrystalline Materials: Synthesis, Characterization, Properties, and Applications

Nanocrystalline Materials: Synthesis, Characterization, Properties, and Applications

Photodynamic Treatment of Titanium Dioxide Nanoparticles is a Convenient Method of Adenoviral Inactivation

PHOTOCATALYTIC ACTIVITY OF MESOPOROUS TiO2 (ANATAS) IN THE REACTION OF HYDROGEN RELEASE FROM AQUEOUS-ETHANOLIC MIXTURE

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