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Artykuły w czasopismach na temat „Titanium dioxide”

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Autor: Grafiati

Data publikacji: 4 czerwca 2021

Data aktualizacji: 31 lipca 2024

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1

Rhee, Dong Seok, Young Do Kim i Se Gu Son. "Comparison of Titanium Dioxides Prepared from Different Materials and its Photocatalytic Evaluation". Advanced Materials Research 749 (sierpień 2013): 77–81. http://dx.doi.org/10.4028/www.scientific.net/amr.749.77.

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Titanium dioxides were synthesized from two different titanium salts, which contained chlorine and sulfur respectively. Titanium dioxide prepared from TiCi4 and had a particle size of ca. 20nm and its phase transition from anatase to rutile stated at 500°C. Titanium dioxide from TiOSO4 had a particle size of ca. 50nm and retained its anatase and sperit structure until 700°C by calcination. For the photocatalytic evaluation of these titanium dioxides, photocatlytic oxidation of organic model pollutant, humic acid, have been conducted. UV absorbance decrease by titanium dioxides prepared from both from TiCi4 and TiOSO4 at room temperature showed very similar results, compared to titanium dioxide prepared from TiCi4 at higher temperature.

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2

Asif Mammadov, Asif Mammadov, Gunel Pashazade, Afarida Gasymova i Ulviya Sharifova. "Production of Iron, Titanium Dioxide Modofocations and Titanium". Chemistry and Chemical Technology 14, nr 2 (15.06.2020): 227–33. http://dx.doi.org/10.23939/chcht14.02.227.

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Mogal, Sajid I., Manish Mishra, Vimal G. Gandhi i Rajesh J. Tayade. "Metal Doped Titanium Dioxide: Synthesis and Effect of Metal Ions on Physico-Chemical and Photocatalytic Properties". Materials Science Forum 734 (grudzień 2012): 364–78. http://dx.doi.org/10.4028/www.scientific.net/msf.734.364.

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Titanium dioxide (Titania; TiO2) is one of the most widely used metal oxide semiconductor in the field of photocatalysis for removal of pollutants. It has been noted that titanium dioxide is a research friendly material as its physico-chemical and catalytic properties can be easily altered as per specific application. Since many years, researchers have tried to modify the properties of titanium dioxide by means of doping with metals and non-metals to improve its performance for photocatalytic degradation (PCD) applications. The doping of various metal ions like Ag, Ni, Co, Au, Cu, V, Ru, Fe, La, Pt, Cr, Ce, etc. in titanium dioxide have been found to be influencing the band gap, surface area, particle size, thermal property, etc. and therefore the photocatalytic activity in PCD. Moreover, photocatalytic activity of doped titanium dioxide has been observed in visible light range (i.e., at wavelength >400 nm). In this review, different synthesis route for doping of metal ions in titanium dioxide have been emphasised. The effect of metal dopant on the structural, textural and photocatalytic properties of titanium dioxide has been reviewed.

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Ustinov, A. A., O. A. Zybina i A. V. Andreev. "On the Impact Caused by Titanium Dioxide of Different Trademarks on the Properties of Intumescent Fire-Protective Coatings". Materials Science Forum 945 (luty 2019): 212–17. http://dx.doi.org/10.4028/www.scientific.net/msf.945.212.

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The paper overviews the process of thermolysis of fire-retardants based on melamine, ammonium polyphosphate and pentaerythtritol and containing titanium dioxide of different trademarks. The role of titanium dioxide as a component of fire-retardants is revised. Titanium dioxide was perceived only as white pigment, but this paper states that the properties of a charred layer forming from an intumescent coating depend on the properties of titanium dioxide's species, such as surface treatment and crystalline structure. This statement is proven by using thermal analysis of intumescents with different titanium dioxide's trademarks; it shows that rutile titanium dioxide helps forming a charred layer with the highest thermal stability thus fire retardant efficiency grows up. It means that the knowledge of processes which occur in intumescents based on primary products with different qualities helps to create fire-protective compositions which will perform more reliable in case of fire.

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5

ISOBE, Kaoru. "Titanium Dioxide". Journal of the Japan Society of Colour Material 84, nr 3 (2011): 104–9. http://dx.doi.org/10.4011/shikizai.84.104.

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6

THAYER, ANN M. "TITANIUM DIOXIDE". Chemical & Engineering News 76, nr 10 (9.03.1998): 10–13. http://dx.doi.org/10.1021/cen-v076n010.p010.

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7

Jongprateep, Oratai, i Rachata Puranasamriddhi. "Effects of Ageing Periods on Compositions and Sizes of Titanium Dioxide Particles Synthesized by Sol-Gel Technique". Key Engineering Materials 658 (lipiec 2015): 185–89. http://dx.doi.org/10.4028/www.scientific.net/kem.658.185.

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Titanium dioxide has attracted worldwide attention due to its prominent photocatalytic activity. It is generally accepted that nanoparticulate titanium dioxide with pure anatase structure exhibits high reactivity. Sol-gel is a simple and cost-effective technique capable of synthesizing anatase-phase titanium dioxide with particle sizes in nanometer range. This research aimed at examining effects of ageing periods on compositions and sizes of titanium dioxide synthesized by sol-gel technique. Experimental results revealed that prolonged ageing period demoted formation of anatase phase. Pure anatase phase was observed at ageing period of 1 day, while both anatase and rutile phases were observed at ageing periods of 4 and 7 days. The results also indicated that particle sizes decreased as the ageing periods increased. Nanoparticulate titanium dioxides with average sizes of 71.5, 50.4, and 29.7 nanometer were observed at ageing periods of 1, 4, and 7 days, respectively.

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8

Racovita, Anca Diana. "Titanium Dioxide: Structure, Impact, and Toxicity". International Journal of Environmental Research and Public Health 19, nr 9 (6.05.2022): 5681. http://dx.doi.org/10.3390/ijerph19095681.

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Titanium dioxide, first manufactured a century ago, is significant in industry due to its chemical inertness, low cost, and availability. The white mineral has a wide range of applications in photocatalysis, in the pharmaceutical industry, and in food processing sectors. Its practical uses stem from its dual feature to act as both a semiconductor and light scatterer. Optical performance is therefore of relevance in understanding how titanium dioxide impacts these industries. Recent breakthroughs are summarised herein, focusing on whether restructuring the surface properties of titanium dioxide either enhances or inhibits its reactivity, depending on the required application. Its recent exposure as a potential carcinogen to humans has been linked to controversies around titanium dioxide’s toxicity; this is discussed by illustrating discrepancies between experimental protocols of toxicity assays and their results. In all, it is important to review the latest achievements in fast-growing industries where titanium dioxide prevails, while keeping in mind insights into its disputed toxicity.

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9

Maltanava, Hanna M., Nadzeya Yu Brezhneva, Alexander V. Mazanik, Semyon O. Mazheika, Tatiana V. Gaevskaya, Ekaterina V. Skorb i Sergey K. Poznyak. "Electrocatalysis of oxygen reduction reaction on gold nanoparticles modified titanium dioxide films with different morphology". Journal of the Belarusian State University. Chemistry, nr 2 (25.08.2020): 63–75. http://dx.doi.org/10.33581/2520-257x-2020-2-63-75.

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Dense and mesoporous titanium dioxide films have been obtained on titanium substrate by means of thermal oxidation, hydrolysis of polybutyltitanate, deposition of titanium dioxide sol, ultrasonic treatment and anodic oxidation and characterized by scanning electron microscopy, transmission electron microscopy and Raman spectroscopy. Electrochemical activity of titanium dioxide films, initial and modified by gold nanoparticles, in oxygen reduction reaction (ORR) in alkaline medium has been studied by cyclic voltammetry. It has been demonstrated that the efficiency of the dense and mesoporous titanium dioxide films in ORR is determined by their morphology, structure and pore ordering degree. Modification of titanium dioxide films by gold nanoparticles results in the decrease in overpotential of the ORR. It has been found that the electrodes consisted of highly ordered layers of titania nanotubes with deposited gold nanoparticles demonstrate sufficiently higher electrocatalytic activity toward the oxygen electroreduction in comparison with TiO2/Au systems based on dense films and mesoporous films with disordered pore structure. Features of electrochemical behavior of TiO2/Au (nanotubes/nanoparticles) system are explained by the peculiarities of electron transport to the electrode surface and structure of space charge layer in the mesoporous oxide film.

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10

Xu, Zhixiang, Jianyuan Zhang, Haiqin Liu, Pengpeng Kuang, Shuang Wang i Xiaoqi Fu. "Preparation of silver/silver bromide/titanium dioxide/graphene oxide nanocomposite for photocatalytic degradation of 4-chlorophenol". Nanomaterials and Nanotechnology 7 (1.01.2017): 184798041772404. http://dx.doi.org/10.1177/1847980417724046.

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A ultaviolet–visible light responded photocatalytic nanocomposite, silver/silver bromide/titanium dioxide, supported on graphene oxide (GO; silver/silver bromide/titanium dioxide/GO) was fabricated via a layer intercalation method using n-butylamine, cetyltrimethyl ammonium bromide, titanium dioxide and silver/silver bromide-intercalated GO successively. The resultant silver/silver bromide/titanium dioxide/GO exhibited much stronger visible light absorption and enhanced photocatalytic efficiency than titanium dioxide/GO and titanium dioxide. Furthermore, the degradation efficiency of silver/silver bromide/titanium dioxide/GO was improved when irradiated under light without the ultaviolet cut filter. The apparent degradation rate constants, k, for silver/silver bromide/titanium dioxide/GO, titanium dioxide/GO and titanium dioxide are 0.5192, 0.2273 and 0.0627 h−1. A possible photocatalytic degradation mechanism for degradation of 4-chlorophenol by silver/silver bromide/titanium dioxide/GO under irradiation with/without the ultaviolet cut filter was proposed. The factors including the visible light response from silver bromide, surface plasmon ‘hot’ electron effect from silver nanoparticles and efficient electron transfer among silver, silver bromide, titanium dioxide and GO are contributed to enhance the photocatalytic activity under visible light irradiation, while the additional factor of ultaviolet light response from titanium dioxide plays an important role under light irradiation without the ultaviolet cut filter. The resultant silver/silver bromide/titanium dioxide/GO possessed a good photochemical stability and reusability.

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11

Štengl, Václav, Jiří Henych, Martin Šťastný i Martin Kormunda. "Fast and Straightforward Synthesis of Luminescent Titanium(IV) Dioxide Quantum Dots". Journal of Nanomaterials 2017 (2017): 1–9. http://dx.doi.org/10.1155/2017/3089091.

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The nucleus of titania was prepared by reaction of solution titanium oxosulphate with hydrazine hydrate. These titania nuclei were used for titania quantum dots synthesis by a simple and fast method. The prepared titanium(IV) dioxide quantum dots were characterized by measurement of X-ray powder diffraction (XRD), X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM), high-resolution electron microscopy (HRTEM), and selected area electron diffraction (SAED). The optical properties were determined by photoluminescence (PL) spectra. The prepared titanium(IV) dioxide quantum dots have the narrow range of UV excitation (365–400 nm) and also a close range of emission maxima (450–500 nm).

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12

Tsyryatieva, A. V. "Effect of titanosilicate additives on the strength of a self-cleaning cement stone." Transaction Kola Science Centre 11, nr 3-2020 (25.11.2020): 209–14. http://dx.doi.org/10.37614/2307-5252.2020.3.4.045.

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The possibility of modifying cement composite by titanosilicate additive, consisting of the mixture of silicon and titanium oxides (TSP —titanosilicate precipitate), obtained by coprecipitation during the interaction of titanite with hydrochloric acid was studied. The properties of the modified TSP cement composite and mechanically prepared mixtures of titanium dioxide (anatase) with silica and titanium dioxide (rutile) with silica are compared. It has been shown that titanosilicate additives in cement compositions increase the compressive strength and give the surface self-cleaning properties.

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13

Wu, Kun Hong, i Fang Huang. "The Research on Adsorption of MB by SPES Microspheres and SPES Microspheres Wrapping Titanium Dioxide". Advanced Materials Research 1096 (kwiecień 2015): 237–42. http://dx.doi.org/10.4028/www.scientific.net/amr.1096.237.

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The polyethersulfone(PES) and sulfonated polyethersulfone(SPES) microspheres which all wraps titanium dioxide could be prepared by solvent evaporation method of double emulsion systems(W1/O/W2) or coagulation bath method. The results on the adsorption performance of methylene blue(MB) by PES and SPES microspheres wrapping titanium dioxide, SPES microspheres excluding titanium dioxide and the comparison of the isothermal and dynamic adsorption of SPES showed that, the adsorption performance of MB by SPES wrapping titanium dioxide is better than PES wrapping titanium dioxide, and the SPES excluding titanium dioxide is better than which wraps titanium dioxide.

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14

Saber, Osama, Hicham Mahfoz Kotb, Mostafa Osama i Hassan A. Khater. "An Effective Photocatalytic Degradation of Industrial Pollutants through Converting Titanium Oxide to Magnetic Nanotubes and Hollow Nanorods by Kirkendall Effect". Nanomaterials 12, nr 3 (27.01.2022): 440. http://dx.doi.org/10.3390/nano12030440.

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Controlling of morphology from nanoparticles to magnetic nanotubes and hollow nanorods are interesting for developing the photo-active materials and their applications in the field of photocatalysis and decontamination of aquatic effluents. In the current study, titanium dioxide nanoparticles and nanocomposites were prepared by different techniques to produce various morphologies. The nanoparticles of pure titanium dioxide were prepared by sol-gel technique. Magnetic nanotubes and hollow nanorods were prepared by combining titanium with di- and tri-valent iron through two stages: urea hydrolysis and solvent thermal technique. According to the Kirkendall effect, magnetic nanotubes were fabricated by unequal diffusion of Fe2+, Fe3+ and Ti4+ inside the nanocomposite to produce maghemite-titanian phase. In the same trend, hollow nanorods were synthesized by limited diffusion of both trivalent iron and tetravalent titanium producing amorphous structure of titanium iron oxides. The magnetic and optical properties showed that these nanotubes and hollow nanorods are magnetically active and optically more effective compared with titanium dioxide nanoparticles. Therefore, the Naphthol green B dye completely disappeared after 45 min of UV light irradiation in presence of the hollow nanorods. The kinetic study confirmed the high performance of the hollow nanorods for the photocatalytic degradation of Naphthol green B compared with titanium dioxide nanoparticles.

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15

Dal Santo, Vladimiro, i Alberto Naldoni. "Titanium Dioxide Photocatalysis". Catalysts 8, nr 12 (29.11.2018): 591. http://dx.doi.org/10.3390/catal8120591.

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16

Fujishima, Akira, Tata N. Rao i Donald A. Tryk. "Titanium dioxide photocatalysis". Journal of Photochemistry and Photobiology C: Photochemistry Reviews 1, nr 1 (czerwiec 2000): 1–21. http://dx.doi.org/10.1016/s1389-5567(00)00002-2.

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17

Zhang, Qiang, i Chaoyang Li. "Pure Anatase Phase Titanium Dioxide Films Prepared by Mist Chemical Vapor Deposition". Nanomaterials 8, nr 10 (13.10.2018): 827. http://dx.doi.org/10.3390/nano8100827.

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In this research, pure anatase phase titanium dioxide thin films were successfully fabricated for the first time using the mist chemical vapor deposition method, and optional values for deposition temperature and concentration of titanium tetraisopropoxide were established. It was found that the crystallinity of the titanium dioxide film was significantly improved by increasing the deposition temperature. The best crystallinity of titanium dioxide film was obtained at 400 °C. It was confirmed that pure anatase phase titanium dioxide films could be obtained using different concentrations of titanium tetraisopropoxide. The lower concentration of titanium tetraisopropoxide produced better crystallinity in the resultant titanium dioxide film. The morphologies of the titanium dioxide thin films were also significantly influenced by the concentration of titanium tetraisopropoxide in the precursor solution.

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18

Sharma, Mamta, i S. S. Tomar. "Synthesis and Antimicrobial Activity of Azobenzene Based Titania Nanoparticles Coated Cotton Fibers". Asian Journal of Organic & Medicinal Chemistry 4, nr 2 (2019): 51–54. http://dx.doi.org/10.14233/ajomc.2019.ajomc-p144.

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In this paper, we report the synthesis of a highly photocatalytic titanium dioxide nanoparticles bondedwith azobenzene and cotton by simple sol-gel method. The synthesized azobenzene based titania nanoparticles coated cotton fibers were characterized using UV-visible and SEM and reported their antimicrobial activity. It was observed that the presence of titanium dioxide bonded with azobenzene effectively prevents both the cotton fibers from getting contaminated.

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19

Vyboishchik, Alexander, i Mikhail Popov. "Production of Pigments on the Basis of Titanium Tetrachloride". MATEC Web of Conferences 346 (2021): 01037. http://dx.doi.org/10.1051/matecconf/202134601037.

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The article describes the manufacture of titanium dioxide, or titania, on the basis of titanium tetrachloride. The main technological requirements for the production of titania are listed, the most prospective raw materials for the chlorination method are given, the description of the technological process for the yield of titania is described.

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20

Vyboishchik, Alexander, i Mikhail Popov. "Production of Pigments on the Basis of Titanium Tetrachloride". MATEC Web of Conferences 346 (2021): 02037. http://dx.doi.org/10.1051/matecconf/202134602037.

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The article describes the manufacture of titanium dioxide, or titania, on the basis of titanium tetrachloride. The main technological requirements for the production of titania are listed, the most prospective raw materials for the chlorination method are given, the description of the technological process for the yield of titania is described.

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21

Zainurul, A. Z., M. F. Achoi, Mohamad Rusop i Saifollah Abdullah. "Effect of Concentration TTIP on Size Nano-Powder Titanium Dioxide (TiO₂)". Advanced Materials Research 832 (listopad 2013): 649–53. http://dx.doi.org/10.4028/www.scientific.net/amr.832.649.

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In this work, titanium Dioxide (TiO2) powder was prepared by sol gel method using Titanium (IV) Isopropoxide (TTIP) as precursor and Ethanol (C2H5OH) as solvent. The sol-gel was heated at temperature 150°C in 1 hour. Titanium Dioxide (TiO2) powder was milled with constant ball to powder ratio (BPR) of 10:1 with speed 600 rpm. Then the sample was characterized using Particle Size Analyzer, Raman Spectroscopy and Scanning Electron Microscope (SEM). Titanium Dioxide (TiO2) powder was prepared with three different concentration of TTIP to the size of Titanium Dioxide (TTIP) powder. Titanium Dioxide (TTIP) powder was milled with ball milling to produce nanopowder of Titanium Dioxide (TiO2).

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22

Gleń, Marta, i Barbara Grzmil. "Photostability and optical properties of modified titanium dioxide". Pure and Applied Chemistry 84, nr 12 (12.10.2012): 2531–47. http://dx.doi.org/10.1351/pac-con-12-01-09.

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The influence of different modifiers, P2O5, K2O, Al2O3, SiO2, CeO2, and ZrO2, on the optical properties and photostability of rutile titanium dioxide was studied. The research was aimed at obtaining pigmentary rutile titanium dioxide with the enhanced photostability. The optical properties such as brightness, white tone, and gray tone were improved when titanium dioxide samples were modified with zirconium instead of cerium. Titanium dioxide products modified additionally with Al2O3 displayed improved optical properties by comparison with appropriate titanium dioxide products lacking introduced aluminum. In comparison with unmodified material (∆E* = 21.8), a considerable increase of the photostability of modified titanium dioxide was observed. The lowest photoactivity, in the range of ∆E* = 0.96–2.45, was measured for the TiO2-PKAlSiCe series. A selective leaching method and X-ray diffraction (XRD) analysis were used to determine the distribution of modifiers in titanium dioxide materials. It was concluded that the differences in both photoactivity and optical properties of modified titanium dioxide depend on its phase composition.

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23

Sooknoi, Tawan, Siriya Jiamesakul, Sitthisuntron Supothina, Angkhana Jaroenworaluck, Thammarat Panyathanmaporn i Kannikar Juengsuwattananon. "G-1 Metal-loaded Titanium Dioxide Nanoparticles as Oxidation Catalyst(Session: Titanium Oxide)". Proceedings of the Asian Symposium on Materials and Processing 2006 (2006): 126–27. http://dx.doi.org/10.1299/jsmeasmp.2006.126.

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Karshyga, Zaure, Almagul Ultarakova, Nina Lokhova, Azamat Yessengaziyev, Kaisar Kassymzhanov i Maxat Myrzakulov. "Technology for Complex Processing of Electric Smelting Dusts of Ilmenite Concentrates to Produce Titanium Dioxide and Amorphous Silica". Metals 12, nr 12 (11.12.2022): 2129. http://dx.doi.org/10.3390/met12122129.

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This paper presents the results of research on the development of a technology intended to process electric smelting dusts of ilmenite concentrate with the extraction of silicon and titanium and the production of products in the form of their dioxides. Dusts were processed for silicon separation using the ammonium fluoride method. The optimum conditions for the fluorination and sublimation process of silicon compounds from the electric smelting dust of the ilmenite concentrate were determined: a temperature of 260 °С, a 6 h duration, and mass ratio of dust to ammonium bifluoride of 1:0.5 ÷ 0.9. The sublimation degree of silicon compounds was ~84–91%. The sublimation of titanium fluorides from the remaining sinter was carried out at a temperature of 600 ± 10 °C for 2 h, the mass ratio titanium-containing residue: ammonium bifluoride of 1:0.5, and the degree of sublimation of titanium fluorides was 99%. Iron, manganese, and chromium impurities in the sublimation of titanium fluorides sublimate to a rather low degree. Pyrohydrolysis of titanium fluoride sublimes at 600 °C and allows for the conversion of fluorides into titanium dioxide by 99.5% in 4–5 h. Titanium dioxide of rutile modification with 99.8% TiO2 was obtained after hydrochloric acid purification and calcination. A technological scheme for the complex processing of dust from the electric smelting of ilmenite concentrates with the production of silica and titanium dioxide is proposed.

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25

Pookmanee, Pusit, Hathaithip Ninsonti, Supaporn Sangsrichan, Wiyong Kangwansupamonkon i Sukon Phanichphant. "Photocatalytic Degradation of Geosmin by Titanium Dioxide Powder Synthesized by the Hydrothermal Route". Advanced Materials Research 93-94 (styczeń 2010): 161–64. http://dx.doi.org/10.4028/www.scientific.net/amr.93-94.161.

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Titanium dioxide powder was synthesized by the hydrothermal route with the starting precursors as titanium isopropoxide, ammonium hydroxide and nitric acid. The final of pH value of mixed solution was 1 and treated in the hydrothermal PTFE vessel at 80-100 °C for 3h. The phase of titanium dioxide was characterized by X-ray diffractometer (XRD). The morphology of titanium dioxide was investigated by scanning electron microscope (SEM). The chemical composition of titanium dioxide was examined by energy dispersive X-ray spectrophotometer (EDXS). The photocatalytic degradation of geosmin by titanium dioxide was determined by gas chromatograph coupled with flame ionization detector (GC-FID).

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Ziental, Daniel, Beata Czarczynska-Goslinska, Dariusz T. Mlynarczyk, Arleta Glowacka-Sobotta, Beata Stanisz, Tomasz Goslinski i Lukasz Sobotta. "Titanium Dioxide Nanoparticles: Prospects and Applications in Medicine". Nanomaterials 10, nr 2 (23.02.2020): 387. http://dx.doi.org/10.3390/nano10020387.

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Metallic and metal oxide nanoparticles (NPs), including titanium dioxide NPs, among polymeric NPs, liposomes, micelles, quantum dots, dendrimers, or fullerenes, are becoming more and more important due to their potential use in novel medical therapies. Titanium dioxide (titanium(IV) oxide, titania, TiO2) is an inorganic compound that owes its recent rise in scientific interest to photoactivity. After the illumination in aqueous media with UV light, TiO2 produces an array of reactive oxygen species (ROS). The capability to produce ROS and thus induce cell death has found application in the photodynamic therapy (PDT) for the treatment of a wide range of maladies, from psoriasis to cancer. Titanium dioxide NPs were studied as photosensitizing agents in the treatment of malignant tumors as well as in photodynamic inactivation of antibiotic-resistant bacteria. Both TiO2 NPs themselves, as well as their composites and combinations with other molecules or biomolecules, can be successfully used as photosensitizers in PDT. Moreover, various organic compounds can be grafted on TiO2 nanoparticles, leading to hybrid materials. These nanostructures can reveal increased light absorption, allowing their further use in targeted therapy in medicine. In order to improve efficient anticancer and antimicrobial therapies, many approaches utilizing titanium dioxide were tested. Results of selected studies presenting the scope of potential uses are discussed in this review.

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Wang, Li, Dong Mei Jia i Zeng Qiang Zhao. "Photocatalytic Degradation of Methyl Orange Using Doped Titanium Dioxide Coating". Advanced Materials Research 955-959 (czerwiec 2014): 112–15. http://dx.doi.org/10.4028/www.scientific.net/amr.955-959.112.

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Titanium dioxide (TiO2) coating was prepared through dipping stainless steel net into titanium dioxide sol and then extracting it. The photocatalytic activities for all titanium dioxide coatings were tested by methyl orange degradation under ultraviolet and visible light irradiation. The photo-absorption property was determined by UV-Vis spectrophotometer. The titanium dioxide coating is photo-catalytically reactive for the degradation of methyl orange. The photo-catalytic activity is influenced by extraction times, degradation time, doping element and light source. La-doped titanium dioxide exhibits the best photocatalytic activity in comparison with undoped, V-doped and La-V-codoped ones. The degradation rate of methyl orange by La-doped titanium dioxide coating reaches 92% after 70 minutes irradiation under ultraviolet light.

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Ji, Pengfei, Kai Lü, Weidong Chen i Mingli Wang. "Study on Preparation of Micro-Arc Oxidation Film on TC4 Alloy with Titanium Dioxide Colloid in Electrolyte". Coatings 12, nr 8 (1.08.2022): 1093. http://dx.doi.org/10.3390/coatings12081093.

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The micro-arc oxidation film on TC4 alloy was prepared using a multifunctional micro-arc oxidation (MAO) power source. The effect of nano-titania colloid addition on the growth process, microstructure, and comprehensive mechanical properties of titanium alloy micro-arc oxidation films was studied by gradient concentration. The results show that, with the increase in titanium dioxide colloid content, the intensity of the discharge phenomenon during the MAO process increases, and the average current density gradually increases. The film thickness is gradually increased from 111.06 μm to 159.8 μm, and the roughness first decreases and then increases. The XRD results show that the rutile content in the film layer is increased with titanium dioxide colloid in the electrolyte. This resulted in an increase in the density of the film, and lead to the corrosion resistance of film improved. When the concentration of titanium dioxide colloid is 1.5 g/L, the comprehensive performance of the film is the best.

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Teramoto, Yudai, Keita Ando, Satoru Tsukada i Katsuyoshi Hoshino. "Triboelectric Charging Behaviors of Polyester Films Doped with Titanium Dioxide Nanoparticles of Various Crystal Structures". Applied Sciences 13, nr 3 (22.01.2023): 1468. http://dx.doi.org/10.3390/app13031468.

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It is empirically known that titanium dioxide nanoparticles stabilize the contact and frictional charge of the host polymers to which they are added. However, the mechanism for the stabilization process has not yet been elucidated. In this study, polyester films doped with titanium dioxide nanoparticles of different crystalline forms were triboelectrically charged and the effect of humidity on their charging characteristics was subsequently investigated to elucidate the charge stabilization mechanism. Our first finding was that the rutile-, rutile–anatase mixed crystal (P25)-, and amorphous-dominant-type titanium dioxide nanoparticles reduced the sensitivity of the films to humidity (humidity dependence), while the anatase-type titanium dioxide enhanced the humidity dependence. This difference in action was explained by associating it with the different water adsorption forms on the major crystalline surface of each titanium dioxide type. The second finding was that doping with titanium dioxide nanoparticles, particularly rutile and P25 nanoparticles, reduced fluctuations in the amount of tribocharges of the polyester film. This crystalline-form-dependent difference in action was considered to be based on the depth of the electron traps involved in each titanium dioxide type. The above two findings have allowed us to propose the first mechanism of tribocharge stabilization by titanium dioxide.

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Manojkumar, M. S., S. Venkatesan i S. Pandiarajan. "Morphological, optical and structural properties of pure, zinc and magnesium doped TiO2 nanoparticles for solar cell devices". Journal of Ovonic Research 18, nr 1 (luty 2022): 29–35. http://dx.doi.org/10.15251/jor.2022.181.29.

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Zn2+and Mg2+ions doped Titanium dioxide had been synthesized using a hydrothermal method at 120°C with an annealing temperature at 450°C, including individual Zn2+and Mg2+ ions. In addition, impact of these doping metal ions on the crystallization and phase transition of the Titanium dioxide nanoparticles were discussed by X-Ray Diffraction spectroscopy, Scanning Electron Microscopy, Fourier Transform Infra-Red spectroscopy, UV-Vis spectroscopy and Photo-Luminescence spectroscopy and also by photocatalytic measurements. The presence of anatase type structure in Titanium dioxide nanopowders with high crystallinity and high phase stability in spite of annealing at 450°C significantly specified that the dopants might prevent densification and crystallite growth in Titanium dioxide nanophase by on condition with different boundaries. Furthermore, with a suitable amount of Zn and Mg dopants, anatase grain size of Titanium dioxide powders was reduced. The band gap energy values of Zn2+ and Mg2+ ions doped nano-Titanium dioxide were lower than the pure nano-Titanium dioxide and they exhibited a red shift in the visible region

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31

Zhou, Shi, Bing Zhou, Chun Ying Huang i Jia Jun Chen. "Preparation of Antibacterial WPU Nanometer Titanium Dioxide Composite". Advanced Materials Research 668 (marzec 2013): 388–92. http://dx.doi.org/10.4028/www.scientific.net/amr.668.388.

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In the paper, WPU nanometer titanium dioxide composite is made mainly of polypropylene glycol (PPG), 2, 4-toluene diisocynate (TDI), nanometer titanium dioxide (TiO2), oleic acid (OA), dimethylolpropionic acid (DMPA), dibutyltin dilaurate (DBTDL), triethylamine (TEA), polypropylene glycol phosphate (PPG-P). Feature of nano particle is analyzed and tested by scanning electron microscope; Fourier infrared spectrum of nanoparticle and composite is tested by fourier infrared spectrometer under room temperature; thermal property test is conducted to composite by thermogravimetric analyzer; XRD test is conducted to nanoparticle and compound thin-film material by X-ray diffractometer; mechanical property of composite is tested by universal stretcher, proving that titanium dioxide does not change structure of WPU and titanium dioxide keeps the original crystal structure instead of being destroyed. Thermogravimetric analysis shows that titanium dioxide raises thermal stability of composite better; mechanical properties prove that increase of 2wt% nanometer titanium dioxide can raise mechanical properties of WPU. Titanium dioxide has extensive application prospect in production and life because it has optical activity and can raise antibiotic property of WPU.

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Gu, Mingwen, Haifeng Zhang, Xiangmu Hu, Yuanhao Jia, Sizhe Qi i Xiang Xie. "Research on the Technology of Titanium Containing Inorganic Particle Doped Insulation Paint". Frontiers in Sustainable Development 3, nr 11 (21.11.2023): 68–71. http://dx.doi.org/10.54691/fsd.v3i11.5728.

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This paper provides a modified titanium dioxide nanotube with a specific structure made by a specific method. The modified titanium dioxide nanotube exists in a nanotube structure with a smaller size and specific surface area, and the surface hydrophobicity treatment of the modified titanium dioxide nanotube is also given, allowing the modified titanium dioxide nanotube to participate in the cross-linking network of organic resins such as unsaturated polyester resin, On the one hand, it can ensure the uniform dispersion of modified titanium dioxide nanotubes in the insulation paint, fully utilize their chemical stability, and also improve the crosslinking degree of resin curing. On the other hand, it enables the modified titanium dioxide nanotubes in this paper to be applied to the insulation paint with a large doping amount, thereby improving the mechanical and electrical properties of the insulation paint.

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Bobeničová, Miroslava, Andrea Čaklóšová i Dana Dvoranová. "The photodegradation of model quinolone carboxylates in aqueous media". Acta Chimica Slovaca 7, nr 1 (1.04.2014): 1–8. http://dx.doi.org/10.2478/acs-2014-0001.

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Abstract This work was focused on the study of photoinduced processes of quinolone carboxylates in the presence of titanium dioxide in an alkaline media. UVA irradiation without/with titanium dioxide caused the decomposition of molecules, with higher efficiency of degradation in the presence of titanium dioxide. EPR spin trapping experiments proved that investigated quinolone carboxylates behave as the efficient scavengers of hydroxyl radicals produced upon irradiation of aerated alkaline titanium dioxide systems.

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34

Sharma, Madhur, Kalpit Shaha, Hemant Sharma i Amit Maheshwari. "Titanium dioxide coating on nickel-titanium archwire". American Journal of Orthodontics and Dentofacial Orthopedics 159, nr 5 (maj 2021): 560–61. http://dx.doi.org/10.1016/j.ajodo.2021.01.015.

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Tismanar, Ioana, Maria Covei, Cristina Bogatu i Anca Duta. "The Influence of the Precursor Type and of the Substrate on the SPD Deposited TiO2 Photocatalytic Thin Films". Annals of West University of Timisoara - Physics 60, nr 1 (1.08.2018): 75–87. http://dx.doi.org/10.2478/awutp-2018-0008.

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AbstractPhotocatalytic degradation of organic pollutants from wastewater using titanium dioxide is recognized as an efficient process. To be feasible, this process needs to be solar- or visible light -activated, but, due to its wide band gap energy, titanium dioxide can only be activated by ultraviolet radiation. In this paper, thin films of titanium dioxide were deposited by Spray Pyrolysis Deposition using organo-metallic (titanium-iso-propoxide) and inorganic (titanium chloride) precursors, as a first step in optimizing the deposition process of titanium dioxide - carbon composite thin films, active in the visible spectral range. The thin films were characterized to outline the differences when using these two precursor solutions, when deposited on Fluorine doped Tin Oxide-glass, regular glass and microscopic glass, in terms of crystallinity (by using X-ray diffraction), elemental composition (using Energy Dispersive X-ray spectrometry), surface morphology (Scanning Electronic Microscopy and Atomic Force Microscopy). The photocatalytic activity of the titanium dioxide thin films was investigated based on the removal efficiencies of methylene blue from a synthetically prepared wastewater. The samples deposited using the inorganic precursor show higher roughness, and this proves to be the most important factor that influences the phocatalytic processes. After 8 hours of ultraviolet irradiation, methylene blue removal efficiencies up to 36% were observed; the highest removal efficiency was registered using the thin titanium dioxide film obtained using the titanium chloride precursor, deposited on fluorine doped tin oxide glass substrate, due to the titanium dioxide-tin dioxide semiconductor tandem formed at the interface, that limits the electron-hole recombination, thus increasing the photoctalytic performance of the substrate.

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Shulyatnikova, Oksana, Gennadiy Rogozhnikov, Svetlana Porozova, A. Rogoznikov i Elena Leushina. "FUNCTIONAL NANOSTRUCTURED MATERIALS BASED ON TITANIUM DIOXIDE FOR USE IN ORTHOPEDIC DENTISTRY". Actual problems in dentistry 16, nr 1 (14.05.2020): 171–77. http://dx.doi.org/10.18481/2077-7566-20-16-1-171-177.

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Subject. The creation of functional ceramic coatings based on titanium dioxide for the manufacture of orthopedic structures, including dental implants and systems for osteosynthesis, helps to prevent possible complications during dental surgical and orthopedic treatment by improving the processes of osseointegration. The goal is to develop domestic proprietary technology for producing nanopowders and functional coatings based on titanium dioxide, free of chemical impurities, which can be used in the practice of orthopedic dentistry for the construction of dental and maxillary prostheses, as well as implant systems. Methodology. The authors developed and proposed a method for applying to medical devices made of titanium, a nanostructured surface layer of titanium dioxide. To provide an evidence base for the advantages of using the proposed titanium dioxide coating, an experimental study was made of its chemical uniformity and freedom from impurities, as well as an assessment of the adhesion force between the oxide layer deposited by titanium dioxide in the anatase phase and the surface of the titanium support. Results. During Raman spectroscopy, titanium dioxide nanopowder did not detect extraneous chemical impurities. According to the results of the method of thermal desorption of nitrogen, the specific surface of the titanium dioxide powder was 67-70 m2 / g, and the average calculated particle size was 20-22 nm. It was shown by optical microscopy that the average thickness of the oxide layer (rutile phase) is 15 ± 5 μm, anatase is 70 ± 10 μm, the adhesion force between the oxide layer (rutile phase) and the titanium base is 6.3 ± 0.1 MPa, at applying anatase - 4.9 ± 0.1 MPa. In the study of the adhesion force of a functional titanium dioxide coating with a titanium base, it was found that the onset of peeling occurs at a load of 8.6 N. Conclusions. Studies of a highly developed functional surface layer of nanostructured titanium dioxide indicate the wide possibilities of its use in the practice of a dentist.

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Sheela, Soumya, Waad Kheder i A. B. Rani Samsudin. "Investigating the influence of titanium particle size and concentration on osteogenic response of human osteoblasts – in vitro study". Biomaterial Investigations in Dentistry 11 (13.06.2024): 66–75. http://dx.doi.org/10.2340/biid.v11.40843.

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Purpose: The purpose of this study was to investigate the correlation between the size and concentration of titanium particles and the osteogenic response of human osteoblasts (HOB). Materials and Methods: Different concentrations of titanium dioxide nano- and micro-particles were prepared and their biocompatibility on HOBs was analyzed using XTT assay. The changes in the actin cytoskeletal organization were studied by confocal laser scanning microscopy. The generation of intracellular reactive oxygen species (ROS) by HOBs after exposure to titanium dioxide particles was analyzed using ROS assay. Besides, the osteogenic potential represented by alkaline phosphatase activity, osteoprotegerin, macrophage colony stimulating factor levels, and biomineralization were analyzed. Results: Short-term interaction of titanium dioxide nano- and micro-particles did not induce toxicity to HOBs. However, cells treated with 100 μg/mL titanium dioxide nano- and micro-particles demonstrated higher ROS generation compared to control. Besides, cells treated with 100 µg/mL titanium dioxide nanoparticles showed higher alkaline phosphatase activity, osteoprotegerin, macrophage colony stimulating factor levels and biomineralization compared to titanium dioxide microparticles. Conclusion: Collectively, the study found titanium dioxide nanoparticles to be more biocompatible than microparticles providing an insight into the capability of nanostructures in supporting osteoblast differentiation and its plausibility in biomedical applications.

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FOMINA, N. N., A. R. ISMAGILOV i V. G. FOMIN. "TITANIUM PIGMENT DIOXIDE DISPERSITY". Building and reconstruction 88, nr 2 (2020): 136–42. http://dx.doi.org/10.33979/2073-7416-2020-88-2-136-142.

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Nad, Suddhasattwa, Parvesh Sharma, Indrajit Roy i Amarnath Maitra. "Anomalous nanostructured titanium dioxide". Journal of Colloid and Interface Science 264, nr 1 (sierpień 2003): 89–94. http://dx.doi.org/10.1016/s0021-9797(03)00459-4.

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Dahl, Michael, Yiding Liu i Yadong Yin. "Composite Titanium Dioxide Nanomaterials". Chemical Reviews 114, nr 19 (11.07.2014): 9853–89. http://dx.doi.org/10.1021/cr400634p.

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Roman, Ioan, Roxana Doina Trusca, Maria-Laura Soare, Corneliu Fratila, Elzbieta Krasicka-Cydzik, Miruna-Silvia Stan i Anca Dinischiotu. "Titanium dioxide nanotube films". Materials Science and Engineering: C 37 (kwiecień 2014): 374–82. http://dx.doi.org/10.1016/j.msec.2014.01.036.

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Xu, Ji-Chuan, Wei-Min Liu i Hu-Lin Li. "Titanium dioxide doped polyaniline". Materials Science and Engineering: C 25, nr 4 (czerwiec 2005): 444–47. http://dx.doi.org/10.1016/j.msec.2004.11.003.

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Ponaryadov, Aleksei V., Olga B. Kotova, Mohammed Tihtih i Shiyong Sun. "Natural titanium dioxide nanotubes". Epitoanyag - Journal of Silicate Based and Composite Materials 72, nr 5 (2020): 152–55. http://dx.doi.org/10.14382/epitoanyag-jsbcm.2020.25.

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Dubrovinskaia, N. A., L. S. Dubrovinsky, V. Swamy i R. Ahuja. "Cotunnite-Structured Titanium Dioxide". High Pressure Research 22, nr 2 (styczeń 2002): 391–94. http://dx.doi.org/10.1080/08957950212781.

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Kinsinger, Nichola, Anthony Tantuccio, Minwei Sun, Yushan Yan i David Kisailus. "Photocatalytic Titanium Dioxide Composite". Journal of Nanoscience and Nanotechnology 11, nr 8 (1.08.2011): 7015–21. http://dx.doi.org/10.1166/jnn.2011.4877.

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Maniruzzaman, Mohammad, Lindong Zhai, Seongcheol Mun i Jaehwan Kim. "Titanium Dioxide Sol-gel Schottky Diodes and Effect of Titanium Dioxide Nanoparticle". Journal of Electrical Engineering and Technology 10, nr 6 (1.11.2015): 2343–47. http://dx.doi.org/10.5370/jeet.2015.10.6.2343.

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47

Su, Shi-Jian, i Noriyuki Kuramoto. "Processable polyaniline–titanium dioxide nanocomposites: effect of titanium dioxide on the conductivity". Synthetic Metals 114, nr 2 (sierpień 2000): 147–53. http://dx.doi.org/10.1016/s0379-6779(00)00238-1.

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Sun, Sheng Min. "Research on Compounding Porous Titanium Dioxide Film by MAO and Photocatalyst". Advanced Materials Research 485 (luty 2012): 153–56. http://dx.doi.org/10.4028/www.scientific.net/amr.485.153.

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Prepared porous titanium dioxide film on the titanium matrix by micro-arc oxidation(MAO) method. Using SEM, XPS, XRD, Raman and other testing methods, the titanium dioxide film was characterized. In the ultraviolet radiation, the effect of MAO titanium dioxide film on the degradation rate of Rhodamine B solution was measured, after 180 minutes, 90% Rhodamine B solution was degraded.

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49

Dai, Kejie, i Xuan Zhao. "Design on a Novel Titanium Dioxide Irregularly Distributed Bragg Reflector for Thin Film Silicon Solar Cells". Journal of Nanoscience and Nanotechnology 20, nr 8 (1.08.2020): 5096–101. http://dx.doi.org/10.1166/jnn.2020.18494.

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Titanium dioxide, which leads an excellent optical performance, is proposed to design irregularly distributed Bragg reflector (IDBR) through theoretical simulation as well as experimental verification. Firstly, a primary distributed Bragg reflector (DBR) model with the titanium dioxide serving as low reflection layer in, and amorphous silicon as high reflection layer is analyzed. The titanium dioxide DBR shows much enhanced reflection bandwidth relative to the DBR with silicon dioxide. A further study suggests that a traditional titanium dioxide IDBR demonstrate much enhanced performance versus the silicon dioxide IDBR with similar structure. Besides, the reflection bandwidth of the IDBR, especially in the high wavelength range, is dramatically promoted with respect to the DBR. Finally, a novel gradient IDBR model is developed. The simulation results reveal a higher reflection bandwidth of the titanium dioxide gradient IDBR than the silicon dioxide one. The reflectance of the titanium dioxide gradient IDBR is up to 90% in a range by 300 to 1450 nm. And, the reflection bandwidth of the gradient IDBR is much improved respect to the traditional IDBR. It seems that the titanium dioxide gradient IDBR could be an efficient selection for the thin film silicon solar cells. Finally, the gradient IDBR were fabricated via plasma enhanced chemical vapor deposition (PECVD) on a silicon wafer. A further test demonstrates a reflectance over 95% in the range from 400 to 1400 nm, and verifies the simulation results.

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Wang, Xiao Lun, Li Ping Liu i Hai Ming Xu. "Application of Photocatalytic Concrete Paint and its Effect of Decomposing Vehicle Exhaust". Advanced Materials Research 683 (kwiecień 2013): 98–105. http://dx.doi.org/10.4028/www.scientific.net/amr.683.98.

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With the widely research of Photocatalytic titanium dioxide, researchers have found another way of managing air quality. As an excellent photocatalyst material, nanometer titanium dioxide has begun to be used in road engineering in recent years. In this paper, at first, different content of titanium dioxide were dispersed evenly and separately in a kind of silane solvent to make the coating material with photocatalytic performance. The results show that nanometer titanium dioxide is able to decompose CO, HC, NO and CO2 after being dispersed in silane solvent. The results also show that a certain content oftitanium dioxide can be chosen after considering effect, workability and economic factors in practical application. Then the brushing method and the decomposition effect of the photocatalytic paint are discussed. The tests indicate that proper content of nanometer titanium dioxide with suitable brushing method can maximize catalytic efficiency. At last, in order to study the decomposition mechanism, using ion chromatography and chemical titration to analyze the decomposition products separately, the results prove that nanometer titanium dioxide can decompose NO, HC, CO and other harmful gases into nitrate and carbonate.

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