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Articoli di riviste sul tema "Titania (Chemical)"

Autore: Grafiati
Pubblicato: 4 giugno 2021
Ultima modifica: 18 febbraio 2022

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1

Rodríguez-Páez, J. E., A. Mafla, G. Andrade e A. Durán. "Modificación química del precursor de titanio para obtener soles estables de silice – titania: Uso de acetilacetona". Boletín de la Sociedad Española de Cerámica y Vidrio 43, n. 1 (28 febbraio 2004): 53–55. http://dx.doi.org/10.3989/cyv.2004.v43.i1.1044.

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2

Shyue, Jing-Jong, Rebecca E. Cochran e Nitin P. Padture. "Transparent-conducting, gas-sensing nanostructures (nanotubes, nanowires, and thin films) of titanium oxide synthesized at near-ambient conditions". Journal of Materials Research 21, n. 11 (novembre 2006): 2894–903. http://dx.doi.org/10.1557/jmr.2006.0352.

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Abstract (sommario):
A template-based, electroless wet-chemical method for synthesis of nanotubes and nanowires of nanocrystalline anatase titanium oxide (titania) at 45 °C is reported. Single-nanowire electrical property measurements reveal low dc resistivities (7–21 × 10−4 Ω cm) in these titania nanowires. In the presence of 1000 parts per million of CO gas at 100 °C, the resistivity is found to increase reversibly, indicating low-temperature gas-sensing capability in these titania nanowires. Thin films of nanocrystalline anatase titania, deposited using a similar wet-chemical method, also have low room-temperature dc resistivities (6–8 × 10−3 Ω cm), and they are transparent to visible light. Nanostructure-properties relations, together with possible electrical conduction, optical absorption, and gas-sensing mechanisms, are discussed. The ability to fashion transparent-conducting and gas-sensing nanocrystalline anatase titania into nanotubes/nanowires and thin films at near-ambient conditions could open a wider field of applications for titania, including nanoelectronics, chemical sensing, solar cells, large-area windows and displays, invisible security circuits, and incorporation of biomolecules and temperature-sensitive moieties.
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3

Garrick, Sean C. "Growth Mechanisms of Nanostructured Titania in Turbulent Reacting Flows". Journal of Nanotechnology 2015 (2015): 1–10. http://dx.doi.org/10.1155/2015/642014.

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Titanium dioxide (titania) is used in chemical sensors, pigments, and paints and holds promise as an antimicrobial agent. This is due to its photoinduced activity and, in nanostructured form, its high specific surface area. Particle size and surface area result from the interplay of fluid, chemical, and thermal dynamics as well as nucleation, condensation and coagulation. After nucleation, condensation, and coagulation are the dominant phenomena affecting the particle size distribution. Manufacture of nanostructured titania via gas-phase synthesis often occurs under turbulent flow conditions. This study examines the competition between coagulation and condensation in the growth of nanostructured titania. Direct numerical simulation is utilized in simulating the hydrolysis of titanium tetrachloride to produce titania in a turbulent, planar jet. The fluid, chemical, and particle fields are resolved as a function of space and time. As a result, knowledge of titania is available as a function of space, time, and phase (vapor or particle), facilitating the analysis of the particle dynamics by mechanism. Results show that in the proximal region of the jet nucleation and condensation are the dominant mechanisms. However once the jet potential core collapses and turbulent mixing begins, coagulation is the dominant mechanism. The data also shows that the coagulation growth-rate is as much as twice the condensation growth-rate.
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Lee, Siew Ling, Jamilah Mohd Ekhsan, Nur Azleena Kasiran e Azira Abdul Aziz. "Effect of Titania Loading on Properties and Catalytic Activity of Nanostructured Phosphate–Vanadia-Impregnated Silica–Titania Oxidative–Acidic Bifunctional Catalyst". International Journal of Chemical Reactor Engineering 13, n. 1 (1 marzo 2015): 21–28. http://dx.doi.org/10.1515/ijcre-2014-0095.

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Abstract Effect of titania loading on physical–chemical properties and bifunctional catalytic activity of phosphate–vanadia-impregnated silica–titania was investigated. Different concentrations of titanium were impregnated into fumed silica, followed by impregnation of vanadium and phosphoric acid simultaneously onto the prepared silica–titania. Results revealed that Ti amount did not have significant effect on crystallinity, surface area and particle size of the resulted materials. However, quantity of tetrahedrally coordinated Ti species increased with increasing Ti content in the sample. Pyridine adsorption study showed the presence of both Brønsted and Lewis acid sites in all the samples even in the titanium-free phosphate–vanadia-impregnated silica sample. The catalytic testing showed that phosphate–vanadia-impregnated silica–titania with the molar ratio of Si:Ti=33:1 was the best bifunctional catalyst in the transformation of 1-octene to 1,2-octanediol using aqueous hydrogen peroxide as oxidant.
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5

Kartaev, E. V., V. P. Lukashov, S. P. Vashenko, S. M. Aulchenko, O. B. Kovalev e D. V. Sergachev. "An Experimental Study of the Synthesis of Ultrafine Titania Powder in Plasmachemical Flow-Type Reactor". International Journal of Chemical Reactor Engineering 12, n. 1 (1 gennaio 2014): 377–96. http://dx.doi.org/10.1515/ijcre-2014-0001.

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Abstract Methods for controlling the synthesis of the submicron (including nanosized) powder of titanium dioxide (titania, TiO2) in a setup with a plasmachemical flow reactor were investigated. The synthesis of titania particles from gaseous titanium tetrachloride (TiCl4) in the plasmachemical reactor by the chloride method was experimentally studied. The processes of formation and growth of particles depending on the type of the plasma-forming gas, flow rates of TiCl4; and the quenching gas (air), reactor length, and mean-mass temperature in the reaction zone were considered. When using nitrogen as heat-carrying gas, a new approach of titania powder synthesis based on combining of reaction zone and quenching zone has been applied. Under these non-equilibrium conditions and substantial temperature gradients, this method enabled us to synthesize reproducibly ultrafine titania powders (30–50 nm) with a high content (80–87%) of metastable anatase crystal lattice. The results reveal that the powder properties can be efficiently controlled, i.e., one setup can produce titania with a required particle size and a type of the crystal lattice: anatase (A) or rutile (R). The experimental data are found to agree well with the results of numerical calculations.
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6

Radtke, Aleksandra. "Photocatalytic Activity of Nanostructured Titania Films Obtained by Electrochemical, Chemical, and Thermal Oxidation of Ti6Al4V Alloy—Comparative Analysis". Catalysts 9, n. 3 (19 marzo 2019): 279. http://dx.doi.org/10.3390/catal9030279.

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Three different Ti6Al4V surface oxidation methods have been applied to obtain three types of titania materials of different nanoarchitecture. Electrochemical oxidation of titanium alloy allowed for obtaining titania nanotubes (TNT), chemical oxidation led to obtain titania nanofibers (TNF), and thermal oxidation gave titania nanowires (TNW). My earlier investigations of these nanomaterials were focused mainly on the estimation of their bioactivity and potential application in modern implantology. In this article, the comparative analysis of the photocatalytic activity of produced systems, as well as the impact of their structure and morphology on this activity, are discussed. The activity of studied nanomaterials was estimated basis of UV-induced degradation of methylene blue and also acetone, and it was determined quantitatively according to the Langmuir–Hinshelwood reaction mechanism. The obtained results were compared to the activity of Pilkington Glass ActivTM (reference sample). Among analyzed systems, titania nanofibers obtained at 140 and 120 °C, possessing anatase and anatase/amorphous structure, as well as titania nanowires obtained at 475 and 500 °C, possessing anatase and anatase/rutile structure, were better photocatalyst than the reference sample. Completely amorphous titania nanotubes, turned out to be an interesting alternative for photocatalytic materials in the form of thin films, however, their photocatalytic activity is lower than for Pilkington Glass ActivTM.
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7

Shrestha, Sabita, e Chong Yun Park. "Deposition of Titania Nanoparticles on the Surface of Acid Treated Multiwalled Carbon Nanotubes". Advanced Materials Research 117 (giugno 2010): 27–32. http://dx.doi.org/10.4028/www.scientific.net/amr.117.27.

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Titanium dioxide (Titania, TiO2) nanoparticles have been deposited on the surface of acid treated multi-walled carbon nanotubes (MWCNTs) by simple chemical route. The resultant TiO2/MWCNTs composites were characterized by different techniques. The oxidation of MWCNTs and presence of titania nanoparticles on the surface of MWCNTs is confirmed by transmission electron microscopy, energy-dispersive X-ray spectroscopy and X-ray photoelectron spectroscopy. TEM image shows the size of titania nanoparticles are around 5 nm. Raman spectroscopy showed the oxidation and functionalization of nanotubes. The TGA curve showed decrease in thermal decomposition temperature of MWCNTs after oxidation and attachment with titania nanoparticles.
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8

Ranney, Elizabeth, John Mansfield, Kai Sun e Johannes Schwank. "Effects of synthesis conditions on dimensions, structure, and oxygen content of photocatalytically active titania nanotubes". Journal of Materials Research 25, n. 1 (gennaio 2010): 89–95. http://dx.doi.org/10.1557/jmr.2010.0011.

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In this study, we report a method for the formation and characterization of aligned arrays of amorphous titania nanotubes by anodic oxidation in thin titanium films on SiO2 substrates using fluoride-containing electrolytes. Trends in titania nanotube geometries as a function of synthesis conditions were established. A titania nanotube array surface area of approximately 178 m2/g is reported. The titania nanotubes transitioned to the rutile crystal structure when heated in air at 530 °C–705 °C. The degradation of methylene blue under UV light showed that lower fluoride concentrations in the synthesis electrolyte result in higher photocatalytic activity of the titania nanotubes. These results indicate that the synthesis conditions affect the oxygen content of amorphous nanotubes, which determines their physical and chemical properties.
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9

Zhang, Fanli, Zhiqiang Cheng, Lijuan Kang, Liying Cui, Wei Liu, Guohui Hou, Hongjia Yang e Xiaojuan Xu. "3D controllable preparation of composite CuO/TiO2 nanofibers". RSC Adv. 4, n. 108 (2014): 63520–25. http://dx.doi.org/10.1039/c4ra12208a.

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The preparation and research of nanometer metal oxides has drawn considerable attention because of their special structure and excellent chemical properties, particularly titania and titanium dioxide composite nanomaterials.
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10

KONDAWAR, S. B., S. R. THAKARE, V. KHATI e S. BOMPILWAR. "NANOSTRUCTURE TITANIA REINFORCED CONDUCTING POLYMER COMPOSITES". International Journal of Modern Physics B 23, n. 15 (20 giugno 2009): 3297–304. http://dx.doi.org/10.1142/s0217979209052583.

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Composites of polyaniline with synthesized nanostructured titania ( TiO 2) and polyaniline with commercial TiO 2 have been in situ synthesized by oxidative chemical polymerization method. Sulfuric acid was used as dopant during the polymerization process. Sol-gel precipitates of nanostructured titania were synthesized by hydrolyzing the mixture of titanium chloride ( TiCl 3) and colloidal transparent solution of starch. Composite materials were subjected for comparison to spectroscopic and X-ray diffraction analysis. Strong coupling/interaction of titania with the imine nitrogen in polyaniline confirmed by FTIR spectral analysis. XRD shows the composite of synthesized titania with polyaniline have broaden peak as compared to that of commercial titania with polyaniline indicating particle size in the range of nanometer scale which is supported by 40 nm particle size of the synthesized titania from TEM picture. Increase in conductivity with increasing temperature was observed in both the composite materials.
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11

Jean, Jau-Ho, Yu-Ching Fang, Steve X. Dai e David L. Wilcox. "Sintering of a Crystallizable K2O–CaO–SrO–BaO–B2O3–SiO2 Glass with Titania Present". Journal of Materials Research 17, n. 7 (luglio 2002): 1772–78. http://dx.doi.org/10.1557/jmr.2002.0262.

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Crystallization and reaction kinetics of a crystallizable K2O–CaO–SrO–BaO–B2O3–SiO2 glass powder with 17–40 vol% titania powder were investigated. The initially amorphous K2O–CaO–SrO–BaO–B2O3–SiO2 glass powder formed cristobalite (SiO2) and pseudowollastonite [(Ca, Ba, Sr)SiO3] during firing. The above crystalline phases were completely replaced by a crystalline phase of titanite [(Ca, Sr, Ba)TiSiO5] when the amount of added titania was greater than a critical value, e.g., 10 vol%, at 99–1100 °C. A chemical reaction taking place at the interface between titania and the glass was attributed to the above observation. The dissolved titania changed the composition of the glass, and the dissolution kinetics was much faster than the formation of cristobalite and pseudowollastonite. Activation energy analysis showed that the crystallization of titanite [(Ca,Sr,Ba)TiSiO5] was controlled by a reaction-limiting kinetics of formation for the Ti–O bond.
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12

Trakanprapai, Chavalit, Vincenzo Esposito, Silvia Licoccia e Enrico Traversa. "Alternative Chemical Route to Mesoporous Titania From a Titanatrane Complex". Journal of Materials Research 20, n. 1 (gennaio 2005): 128–34. http://dx.doi.org/10.1557/jmr.2005.0007.

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High-purity, mesoporous titania was prepared by reaction of dimethylaminotitanatrane, [NMe2–Ti(OCH2CH2)3N] in the presence of micellar aggregates as templating agents followed by thermal treatments in the temperature range 350–450 °C. The powders were characterized by nitrogen adsorption–desorption isotherms, thermogravimetry–differential thermal analysis, Fourier transform infrared, field-emission scanning electron microscopy, and x-ray diffraction. Analysis of the morphological characteristics of titanium oxide powders calcined at 350 °C for 120 h and at 450 °C for 6 h showed the presence of a mesoporous structure, with an average pore size of about 3.5 nm. Firing temperatures above 450 °C caused the collapse of the mesoporous structure. Composite Nafion-based membranes, containing 5 wt% mesoporous titania fired at 450 °C as a filler were successfully prepared. Preliminary tests in a prototype direct methanol fuel cell demonstrated that the composite membrane allowed cell operation up to 145 °C, thus showing a significant performance improvement over pure Nafion.
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13

Venz, P. A., R. L. Frost e J. T. Kloprogge. "Chemical properties of modified titania hydrolysates". Journal of Non-Crystalline Solids 276, n. 1-3 (ottobre 2000): 95–112. http://dx.doi.org/10.1016/s0022-3093(00)00267-2.

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14

Kasuga, T., M. Hiramatsu, A. Hoson, T. Sekino e K. Niihara. "Titania Nanotubes Prepared by Chemical Processing". Advanced Materials 11, n. 15 (ottobre 1999): 1307–11. http://dx.doi.org/10.1002/(sici)1521-4095(199910)11:15<1307::aid-adma1307>3.0.co;2-h.

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15

Shozui, T., Kanji Tsuru, Satoshi Hayakawa e Akiyoshi Osaka. "In Vitro Apatite-Forming Ability of Titania Films Depends on Their Substrates". Key Engineering Materials 330-332 (febbraio 2007): 633–36. http://dx.doi.org/10.4028/www.scientific.net/kem.330-332.633.

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Titania films were coated by means of sol-gel method on various substrates such as titanium, titanium alloy, silicon wafer, stainless-steel, alumina, and glass slide where they coded as C5Ti, C5Ti6Al4V, C5Si, C5SUS, C5Al2O3 and C5GS, respectively. Their in vitro apatite-forming ability was examined with the Kokubo’s simulated body fluid (SBF; pH 7.4, 36.5°C). C5Ti, C5Ti6Al4V and C5Si deposited apatite particles on their surface within 7 days, whereas, C5SUS, C5Al2O3 and C5GS did not. These results implied that the in vitro apatite-forming ability of the titania films indirectly depended on the chemical or physical properties of the substrates.
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16

Elghniji, Kais, Mohamed Saad, Manel Araissi, Elimame Elaloui e Younes Moussaoui. "Chemical modification of TiO2 by H2PO4−/HPO42− anions using the sol-gel route with controlled precipitation and hydrolysis: enhancing thermal stability". Materials Science-Poland 32, n. 4 (1 dicembre 2014): 617–25. http://dx.doi.org/10.2478/s13536-014-0237-6.

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AbstractTwo titanium phosphate materials (TpP and ThP) have been successfully synthesized by sol-gel route with controlled precipitation and hydrolysis. The TpP material was obtained from the reaction between precipitated titania and phosphate buffer solution H2PO4− /HPO42− (pH = 7.3). The TpP material was prepared through hydrolysis of titanium in the presence of H2PO4−/HPO42. The probable state of the phosphate anions in titania framework and their effect on the anatase-to-rutile transformation were characterized by ICP-AES, DTA-TG, 31P NMR, FT-IR, and Raman analysis HRTEM/SEM. FT-IR and 31P NMR analyses of titanium phosphate TpP calcined at low temperature showed that the phosphate species existed not only as Ti-O-P in the bulk TiO2 but also as amorphous titanium phosphates, including bidentate Ti(HPO4)2 and monodentate Ti(H2PO4)4. Increased calcination temperature only gave an enrichment of bidentate structure on the titania surface. For the TpP material, H2PO4−/HPO42− anions were introduced into the initial solution, before precipitation, what promoted their lattice localization. At high temperatures, all the phosphorus inside the bulk of TiO2 migrated to the surface. The Raman analysis of both samples showed that the bidentate phosphates increased the temperature of the anatase-to-rutile phase transformation to more than 1000 °C with the formation of well crystalline TiP2O7 phase. This phenomenon was more evident for TpP sample.
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17

Liu, Peng, Huanrong Li, Yige Wang, Binyuan Liu, Wenjun Zhang, Yanji Wang, Weidong Yan, Hongjie Zhang e Ulrich Schubert. "Europium complexes immobilization on titania via chemical modification of titanium alkoxide". Journal of Materials Chemistry 18, n. 7 (2008): 735. http://dx.doi.org/10.1039/b717864f.

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18

Ahmad, Imteyaz, Subramshu Bhattacharya e Horst Hahn. "In-situ nitrogen doping and boron modification of nanocrystalline titania powders by chemical vapour synthesis". Processing and Application of Ceramics 3, n. 3 (2009): 113–17. http://dx.doi.org/10.2298/pac0903113a.

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During the chemical vapour synthesis (CVS) of nanocrystalline titania doping and/or modification can be directly carried out in-situ by using an additional precursor. In this study, nitrogen doped nanocrystalline titania powders and boron modified nanocrystalline titania powders were synthesised by CVS. The resultant powders were characterised by X-ray diffraction (XRD) and UV-vis spectroscopy. In both cases, a red shift in the band gap of titania was seen. Electron paramagnetic resonance spectroscopy (EPR) showed the presence of nitrogen in the titania lattice. Solid state nuclear magnetic resonance (NMR) spectroscopy showed that boron in titania was present in BO4 coordination with the oxygen atoms.
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19

Grigorieva, Anastasia V., Valentina V. Yuschenko, Irina I. Ivanova, Eugene A. Goodilin e Yuri D. Tretyakov. "Chemical Tuning of Adsorption Properties of Titanate Nanotubes". Journal of Nanomaterials 2012 (2012): 1–7. http://dx.doi.org/10.1155/2012/920483.

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A conventional hydrothermal method widely used for the preparation of titania-based nanotubes still generates many unsolved questions. One of them is definitely connected with the influence of a posthydrothermal treatment of titania nanotubes on their micromorphology, structure, and adsorption characteristics. Here, it was analyzed systematically by a group of methods including nitrogen adsorption and temperature-programmed desorption of ammonia and carbon dioxide. It is proved that adsorption characteristics and the surface state of titania nanotubes correlate with a sodium content, since sodium ions act as Lewis acid sites and shield Ti4+acid sites of the nanotubes. To obey a balance between chemical and heat treatments of the nanotubes to design their functional properties has been suggested.
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20

Shin, Euisup S., Ill Yong Kim, Sung Baek Cho e Chikara Ohtsuki. "Inhibitory Effects of Doped Aluminum and Silicon on HAp-Forming Ability of Titania in Simulated Body Fluid". Key Engineering Materials 529-530 (novembre 2012): 641–45. http://dx.doi.org/10.4028/www.scientific.net/kem.529-530.641.

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Chemical modification of titanium substrate provides ability of hydroxyapatite (HAp) formation that is important property for bone-bonding capability after implantation in bony defects. Potential of the HAp-formation is occasionally reduced. In the present study, we investigated potential of the HAp-formation on titanium oxide (titania) with doped silicon or aluminum in simulated body fluid (SBF). Sol-gel processing was applied to prepare titania with doped silicon (TSx) or aluminum (TAx), in its nominal composition ranging from 0 to 10 mol%. Specific surface area of the prepared samples was gradually increased with increasing the amounts of silicon or aluminum. Zeta potential of TAx was definite changed from negative charge to positive charge with increasing aluminum amounts, but TSx slightly changed to be positive with increasing silicon amounts. The pure titania sample free from doping of silicon or aluminum showed formation of calcium phosphate precipitates, that is HAp-formation, after soaking in SBF for 14 d. In contrast, all the titania samples with doped silicon or aluminum hardly showed evidence of precipitates of calcium phosphates, although absorption of calcium and phosphate ions were detected. Especially, TAx showed remarkable adsorption of phosphate ions. Aluminum-doping in titania enhances the adsorption of phosphate ion on the surface, but reduce nucleation rate of calcium phosphates in body environment.
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Yabe, S., Kanji Tsuru, Satoshi Hayakawa, Akiyoshi Osaka, Y. Yoshida, K. Suzuki e T. Kuboki. "Cell Proliferation on Titania Layer with In Vitro Apatite Forming Ability". Key Engineering Materials 330-332 (febbraio 2007): 131–34. http://dx.doi.org/10.4028/www.scientific.net/kem.330-332.131.

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Titania layer was fabricated on the titanium substrates with chemical treatment with 20ml or 40ml of hydrogen peroxide solution and subsequent heat treatment at 400°C, coded as CHT20 and CHT40, respectively. CHT20 spontaneously deposited apatite on the surface in a simulated body fluid (SBF), while CHT40 did not. TF-XRD patterns showed that the diffraction intensity of anatase of CHT20 was higher than that of CHT40. It was suggested that the thicker titania layer indicated in vitro apatite forming ability. The cell proliferation of CHT20 and CHT40 were lower than NT and HT. Since the surface of titania layers became hydrophobic after autoclaving, we can suppose that the cell proliferation on CHT20 and CHT40 were lower than NT and HT due to their surface hydrophobicity.
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22

Furlani, Erika, Eleonora Aneggi, Carla de Leitenburg e Stefano Maschio. "High energy ball milling of titania and titania–ceria powder mixtures". Powder Technology 254 (marzo 2014): 591–96. http://dx.doi.org/10.1016/j.powtec.2014.01.075.

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Sun, Tao, e Min Wang. "Characteristics and Chemical Stability of the Bioactive Titania Layer Formed on Ti, Ti-6Al-4V and NiTi SMA through a Low Temperature Oxidation Process". Advanced Materials Research 47-50 (giugno 2008): 1403–6. http://dx.doi.org/10.4028/www.scientific.net/amr.47-50.1403.

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To improve the biocompatibility and bioactivity of titanium and titanium alloys, a titanium oxide layer was synthesized on Ti, Ti-6Al-4V and NiTi shape memory alloy (SMA) using a H2O2-oxidation and hot water aging technique. The surface of these metals before and after the oxidation treatment was characterized using scanning electron microscopy and energy dispersive X-ray spectroscopy. Because of the synthetic titanium oxide surface layer, the Al and V contents on the surface of as-oxidized Ti-6Al-4V decreased significantly. Similarly, the Ni content on the surface of as-oxidized NiTi SMA was also significantly reduced. Potentiodynamic polarization curves indicated that the synthetic titania layer was more chemically stable than the spontaneous titania film on the metals. Among the three metals, the oxide layer on Ti was the most stable chemically. The in vitro bioactivity of as-oxidized metals was assessed through incubation in simulated body fluid (SBF). Compared to as-oxidized Ti-6Al-4V and NiTi SMA, as-oxidized Ti was the most bioactive.
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Sakurada, Osamu, Mizuki Komaba, Seizo Obata, Minoru Hashiba e Yasutaka Takahashi. "Electrophoretic Deposition on Anodes from Aqueous Titania Suspensions with Titanate Solution". Key Engineering Materials 412 (giugno 2009): 313–16. http://dx.doi.org/10.4028/www.scientific.net/kem.412.313.

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Titanate aqueous solution (TTIP-Lac) prepared by direct reaction of titanium tetraisopropoxide (TTIP) with lactic acid (Lac) in water shows characteristics of a polyanion and acts as a dispersant for preparing titanate suspension. Electrophoretic deposition (EPD) of aqueous titania suspensions was investigated with TTIP-Lac as a dispersant and hydroquinone (HQ) as an effective additive for bubble-free EPD of the aqueous system. The oxygen produced electrolytically by the EPD process at basic pH would be consumed by the chemical oxidation of HQ to quinone (Q). Bubble-free titania depositions were fabricated on anodes by EPD. A fired density with 99% theoretical density was obtained.
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Galstyan, Vardan, Elisabetta Comini, Camilla Baratto, Andrea Ponzoni, Matteo Ferroni, Nicola Poli, Elza Bontempi, Mariangela Brisotto, Guido Faglia e Giorgio Sberveglieri. "Large surface area biphase titania for chemical sensing". Sensors and Actuators B: Chemical 209 (marzo 2015): 1091–96. http://dx.doi.org/10.1016/j.snb.2014.12.027.

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Kasuga, Tomoko, Masayoshi Hiramatsu, Akihiko Hoson, Toru Sekino e Koichi Niihara. "ChemInform Abstract: Titania Nanotubes Prepared by Chemical Processing." ChemInform 31, n. 2 (11 giugno 2010): no. http://dx.doi.org/10.1002/chin.200002255.

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27

Leboda, R., V. M. Gun'ko, M. Marciniak, A. A. Malygin, A. A. Malkin, W. Grzegorczyk, B. J. Trznadel, E. M. Pakhlov e E. F. Voronin. "Structure of Chemical Vapor Deposition Titania/Silica Gel". Journal of Colloid and Interface Science 218, n. 1 (ottobre 1999): 23–39. http://dx.doi.org/10.1006/jcis.1999.6411.

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Wang, LuYan, YanPing Sun e BingShe Xu. "Surface chemical structure of titania-silica nanocomposite powder". Science Bulletin 53, n. 19 (28 settembre 2008): 2964–72. http://dx.doi.org/10.1007/s11434-008-0427-x.

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29

Sekino, Tohru, Takumi Okamoto, Tomoko Kasuga, Takafumi Kusunose, Tadachika Nakayama e Koichi Niihara. "Synthesis and Properties of Titania Nanotube Doped with Small Amount of Cations". Key Engineering Materials 317-318 (agosto 2006): 251–54. http://dx.doi.org/10.4028/www.scientific.net/kem.317-318.251.

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We have investigated a synthesis of metal (Nb, V, Cr, Mn, Co) -doped titania nanotubes using a solution chemical processing in order to control optical and electrical properties. Titania nanotubes doped with a small amount of cations up to 1 wt% exhibited similar morphology and XRD pattern as the pure titania nanotubes, however, color of nanotubes was changed depending on the dopants. It was found that Cr, Mn and Co doped titania nanotubes formed new absorption bands in UV spectra. On the other hand, electrical resistivity of doped titania nanotubes was lower than that of pure titania nanotubes.
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30

Tong, Zhenwei, Yanjun Jiang, Dong Yang, Jiafu Shi, Shaohua Zhang, Chuang Liu e Zhongyi Jiang. "Biomimetic and bioinspired synthesis of titania and titania-based materials". RSC Advances 4, n. 24 (2014): 12388. http://dx.doi.org/10.1039/c3ra47336h.

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31

Hayakawa, Satoshi, K. Shibata, Kanji Tsuru e Akiyoshi Osaka. "Apatite Induction on Titania due to Combined Chemical and Thermal Treatments of Titanium". Key Engineering Materials 218-220 (novembre 2001): 71–74. http://dx.doi.org/10.4028/www.scientific.net/kem.218-220.71.

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32

Mahata, S., B. Mondal, S. S. Mahata, K. Usha, N. Mandal e K. Mukherjee. "Chemical modification of titanium isopropoxide for producing stable dispersion of titania nano-particles". Materials Chemistry and Physics 151 (febbraio 2015): 267–74. http://dx.doi.org/10.1016/j.matchemphys.2014.11.065.

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33

Tashiro, Yuichiro, Satoshi Komasa, Akiko Miyake, Hiroshi Nishizaki e Joji Okazaki. "Analysis of Titania Nanosheet Adsorption Behavior Using a Quartz Crystal Microbalance Sensor". Advances in Materials Science and Engineering 2018 (2018): 1–10. http://dx.doi.org/10.1155/2018/7461245.

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Abstract (sommario):
We investigated the adsorption of albumin and fibronectin on a titania nanosheet- (TNS-) modified quartz crystal microbalance (QCM) sensor. A Ti QCM sensor was fabricated by reactive magnetron sputtering. A thin layer of Ti was deposited on the QCM sensor. This sensor was then alkali-modified by treatment with NaOH at room temperature to fabricate the titania nanosheets. Scanning probe microscopy, X-ray photoelectron spectroscopy, and scanning electron microscopy were performed to investigate the surface topology and chemical components of each sensor. The TNS had a titanium oxide film exhibiting a nodular structure and a thickness of 13 nm on the QCM sensor. Furthermore, QCM measurements showed significantly greater amounts of albumin and fibronectin adsorbed on the TNS than on titanium. The NaOH treatment of titanium modified the sensor surface and improved the adsorption behaviors of proteins related to the initial adhesion of bone marrow cells. Therefore, we concluded that TNS improves the initial adhesion between the implant materials and the surrounding tissues.
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34

Yeh, C. L., S. H. Yeh e H. K. Ma. "Flame synthesis of titania particles from titanium tetraisopropoxide in premixed flames". Powder Technology 145, n. 1 (luglio 2004): 1–9. http://dx.doi.org/10.1016/j.powtec.2004.04.042.

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35

Akhtar, M. Kamal, Yun Xiong e Sotiris E. Pratsinis. "Vapor synthesis of titania powder by titanium tetrachloride oxidation". AIChE Journal 37, n. 10 (ottobre 1991): 1561–70. http://dx.doi.org/10.1002/aic.690371013.

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36

Santillán, M. J., Nancy E. Quaranta, F. Membrives, Judith A. Roether e Aldo Roberto Boccaccini. "Processing and Characterization of Biocompatible Titania Coatings by Electrophoretic Deposition". Key Engineering Materials 412 (giugno 2009): 189–94. http://dx.doi.org/10.4028/www.scientific.net/kem.412.189.

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The electrophoretic deposition (EPD) technique was developed for depositing TiO2 films on stainless steel (SS) and titanium substrates. Titania coatings were obtained in conditions of optimal solution stability using acetylacetone suspensions of TiO2 nanoparticles and I2 at pH≈ 5. Deposition tests were carried out at 10V for varying times. The deposit thickness was seen to increase with EPD time, revealing that the deposits grew quickly for times <120 s, reaching a saturation value at longer times. The substrates were treated by physical and chemical methods before EPD in order to improve the adhesion of the films. The EPD coatings were sintered at 700, 800 and 900 °C under controlled argon atmosphere or in vacuum to study the influence of sintering atmosphere on crystalline phase transformation. The TiO2 coatings were characterized by XRD using Rietveld analysis. The results showed that TiO2 films on Ti substrates (chemically leached before deposition) had better adherence, homogeneity and density than those on SS. The coatings sintered al 700°C in vacuum resulted in a major proportion of anatasa phase. The porosity of the titania coatings sintered at 700°C (2 hr) in vacuum was calculated to be 19% .
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37

Zu, Guoqing, Jun Shen, Wenqin Wang, Liping Zou, Ya Lian e Zhihua Zhang. "Silica–Titania Composite Aerogel Photocatalysts by Chemical Liquid Deposition of Titania onto Nanoporous Silica Scaffolds". ACS Applied Materials & Interfaces 7, n. 9 (27 febbraio 2015): 5400–5409. http://dx.doi.org/10.1021/am5089132.

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38

Al-Shafei, Mansour A., Ahmed K. Al-Asseel, Abdulhadi M. Adab, Hasan A. Al-Jama, Amer A. Al-Tuwailib e Shouwen X. Shen. "Deactivation Mechanism of Titania Catalyst". Journal of Materials Science Research 5, n. 4 (27 agosto 2016): 22. http://dx.doi.org/10.5539/jmsr.v5n4p22.

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<p class="1Body">Catalyst deactivation is a well-recognized phenomenon in the petroleum and chemical processing industries. Identifying the root causes of this phenomenon is an important factor for enhancing catalyst efficiency and preventing undesirable failures. In this study, state-of-the-art instruments were utilized to investigate the causes of catalyst deactivation that led to the replacement of the catalyst bed in one of the sulfur recovery units at a Saudi Aramco gas plant. Titania catalysts have been examined to determine the inherent deactivation mechanism and also to find out the possibilities of its curement. Understanding the root cause of the deactivation is mandatory for field engineers to minimize future catalyst deactivation. The collected analysis data revealed that the deactivation mechanism occurred for the Ti catalyst due to irreversible chemical phase transformation of the catalyst caused by a temperature runway in the catalytic converter.</p>
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39

Mahu, Elvira, Cristina Giorgiana Coromelci, Doina Lutic, Iuliean Vasile Asaftei, Liviu Sacarescu, Valeria Harabagiu e Maria Ignat. "Tailoring Mesoporous Titania Features by Ultrasound-Assisted Sol-Gel Technique: Effect of Surfactant/Titania Precursor Weight Ratio". Nanomaterials 11, n. 5 (11 maggio 2021): 1263. http://dx.doi.org/10.3390/nano11051263.

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A mesoporous titania structure has been prepared using the ultrasound-assisted sol-gel technique in order to find out a way to tailor its structure. The TiO2 obtained was compared to the same version of titania but synthesized by a conventional sol-gel method with the objective of understanding the effect of ultrasound in the synthesis process. All synthesis experiments were focused on the preparation of a titania photocatalyst. Thus, the anatase photocatalytic active phase of titania was proven by X-ray diffraction. Additionally, the ultrasonation treatment proved to increase the crystallinity of titania samples, being one of the requirements to having good photocatalytic activity for titania. The influence of surfactant/titania precursor weight ratio on the structural (XRD), textural (N2-sorption measurements), morphological (TEM), surface chemistry (FTIR) and optical properties (UVDR) was investigated. It was observed that the crystallite size, specific surface area, band gap energy and even photocatalytic activity was affected by the synergism occurring between cavitation effect and the surfactant/titania precursor weight ratio. The study yielded interesting great results that could be considered for further application of ultrasound to tailor mesoporous titania features via sol-gel soft template synthesis, against conventional sol-gel process.
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40

Liu, Yue Long, e Jia Liu. "Transformation between Antase and Rutile Titania-Mica Pearlescent Pigment by MnO2 Induced Process". Advanced Materials Research 1035 (ottobre 2014): 268–71. http://dx.doi.org/10.4028/www.scientific.net/amr.1035.268.

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A chemical inducing process was developed to prepare titania-mica pearlescent pigment. MnO2 was used as crystal inducing promoters, a transformation between antase and rutile titania-mica pearlescent pigment was found by calcining at 800°C for 0.5 h. The mass ratio of mica to MnO2, pH value, temperature and dripping rate of MnO2solution and TiOSO4was studied. The crystalline form of titania-mica pearlescent pigment was measured by XRD.
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41

Qian, Lei, Zu-Ling Du, Sheng-Yi Yang e Zhen-Sheng Jin. "Raman study of titania nanotube by soft chemical process". Journal of Molecular Structure 749, n. 1-3 (luglio 2005): 103–7. http://dx.doi.org/10.1016/j.molstruc.2005.04.002.

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42

Mazza, T., E. Barborini, I. N. Kholmanov, P. Piseri, G. Bongiorno, S. Vinati, P. Milani et al. "Libraries of cluster-assembled titania films for chemical sensing". Applied Physics Letters 87, n. 10 (5 settembre 2005): 103108. http://dx.doi.org/10.1063/1.2035874.

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43

Seifried, S., M. Winterer e H. Hahn. "Nanocrystalline Titania Films and Particles by Chemical Vapor Synthesis". Chemical Vapor Deposition 6, n. 5 (ottobre 2000): 239–44. http://dx.doi.org/10.1002/1521-3862(200010)6:5<239::aid-cvde239>3.0.co;2-q.

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44

Ortiz-Islas, E., T. López, R. Gómez, J. Navarrete, D. H. Aguilar, P. Quintana e M. Picquart. "Molybdophosphoric acid in sol–gel titania: Physico-chemical properties". Applied Surface Science 252, n. 3 (ottobre 2005): 839–46. http://dx.doi.org/10.1016/j.apsusc.2005.02.112.

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45

Habazaki, H., M. Uozumi, H. Konno, K. Shimizu, P. Skeldon e G. E. Thompson. "Crystallization of anodic titania on titanium and its alloys". Corrosion Science 45, n. 9 (settembre 2003): 2063–73. http://dx.doi.org/10.1016/s0010-938x(03)00040-4.

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46

Sun, Ruixue, Musen Li, Yupeng Lu e Xianghai An. "Effect of titanium and titania on chemical characteristics of hydroxyapatite plasma-sprayed into water". Materials Science and Engineering: C 26, n. 1 (gennaio 2006): 28–33. http://dx.doi.org/10.1016/j.msec.2005.05.003.

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47

Tseng, Yao-Hsuan, Chien-Sheng Kuo, Chia-Hung Huang e Yuan-Yao Li. "Preparation of Visible-Light-Responsive Nitrogen-carbon Co-doped Titania by Chemical Vapor Deposition". Zeitschrift für Physikalische Chemie 224, n. 06 (1 luglio 2010): 843–56. http://dx.doi.org/10.1524/zpch.2010.5512.

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Abstract (sommario):
AbstractNitrogen-doped titania (N-doped TiO2) and nitrogen-carbon co-doped titania (N-C-doped TiO2) were prepared in metal-organic chemical vapor deposition (MOCVD) processes under the controlled reaction atmosphere. The N-doped TiO2 and N-C-doped TiO2 with anatase phase were prepared at 600Â oC under N2-O2-NH3 and N2-NH3 atmospheres respectively. The N-C-doped TiO2 exhibited the high photocatalytic activity for the oxidation of NO under visible-light illuminations. The chamber atmosphere in the MOCVD process plays an important role on the surface lattice structure and nitrogen and carbon content of TiO2. The nitrogen and carbonaceous species on the TiO2 surface, evidenced from X-ray diffractometry (XRD), UV-VIS, and Raman spectroscopy, and X-ray photoelectron spectroscopy (XPS), were inferred as important factors for narrowing band gap of titania and enhancement of its visible-light-responsive activity.
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48

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

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Abstract (sommario):
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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49

De, Nilanjan. "On Molecular Topological Properties of TiO2 Nanotubes". Journal of Nanoscience 2016 (23 novembre 2016): 1–5. http://dx.doi.org/10.1155/2016/1028031.

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Abstract (sommario):
Titania nanotube is a well-known semiconductor and has numerous technological applications. In chemical graph theory, topological indices provide an important tool to quantify the molecular structure and it is found that there is a strong correlation between the properties of chemical compounds and their molecular structure. Among different topological indices, degree-based topological indices are most studied and have some important applications. In this study, several old and new degree-based topological indices have been investigated for titania TiO2 nanotubes.
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50

Sariman, Sariman, Yuni Krisyuningsih Krisnandi e Budi Setiawan. "Anatase TiO2 Enrichment from Bangka Ilmenite (FeTiO3) and its Photocatalytic Test on Degradation of Congo Red". Advanced Materials Research 789 (settembre 2013): 538–44. http://dx.doi.org/10.4028/www.scientific.net/amr.789.538.

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Abstract (sommario):
Anatase TiO2 enrichment from Bangka ilmenite (FeTiO3) has been conducted. First, ilmenite was mechanically activated using a planetary ballmill to obtain sub-micron sized particle followd by magnetic separation. Chemical treatment, dissolution of iron using hydrochloric solution, was performed to obtain titania rich residue. EDX data shows that the iron content was reduced in the titania residue. Ammonium hydroxide (NH4OH) solution was added to the washed precipitate, before adding H2O2 solution (10%) that acted as a coordination agent to leach titanium from the the residue in the form of ammonium peroxo titanate solution. The peroxo titanate powder was obtained by evaporating the ammonium peroxo titanate solution. XRD data show that TiO2 anatase was formed after peroxo titanate powder was calcined at the temperature of 600°C. EDX data also shows that the obtained anatase TiO2 still has impurities, such as silicon (0.98%) and iron (2.75%). Its photocatalytic activity was studied on photodegradation of Congo Red and compared with the photocatalytic activity of commercial TiO2, Degussa P-25. The photoreactivity test on degradation of Congo Red solution with the as-prepared Anatase gave 20% degradation which is still inferior compared to the results given by Degussa P25 (92%). This indicates that the impurities in as-prepared Anatase may cover the titania surface hindering the contact between Congo Red as well as UV-light and the active titania species.
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