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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, and A. Durán. "Modificación química del precursor de titanio para obtener soles estables de silice â titania: Uso de acetilacetona." Boletín de la Sociedad Española de Cerámica y Vidrio 43, no. 1 (February 28, 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, and 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, no. 11 (November 2006): 2894–903. http://dx.doi.org/10.1557/jmr.2006.0352.

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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-temperat

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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.

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4

Lee, Siew Ling, Jamilah Mohd Ekhsan, Nur Azleena Kasiran, and 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, no. 1 (March 1, 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. Py

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5

Kartaev, E. V., V. P. Lukashov, S. P. Vashenko, S. M. Aulchenko, O. B. Kovalev, and 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, no. 1 (January 1, 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 nitro

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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, no. 3 (March 19, 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 w

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7

Shrestha, Sabita, and Chong Yun Park. "Deposition of Titania Nanoparticles on the Surface of Acid Treated Multiwalled Carbon Nanotubes." Advanced Materials Research 117 (June 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. T

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8

Ranney, Elizabeth, John Mansfield, Kai Sun, and Johannes Schwank. "Effects of synthesis conditions on dimensions, structure, and oxygen content of photocatalytically active titania nanotubes." Journal of Materials Research 25, no. 1 (January 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 syn

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9

Zhang, Fanli, Zhiqiang Cheng, Lijuan Kang, Liying Cui, Wei Liu, Guohui Hou, Hongjia Yang, and Xiaojuan Xu. "3D controllable preparation of composite CuO/TiO2 nanofibers." RSC Adv. 4, no. 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, and S. BOMPILWAR. "NANOSTRUCTURE TITANIA REINFORCED CONDUCTING POLYMER COMPOSITES." International Journal of Modern Physics B 23, no. 15 (June 20, 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

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11

Jean, Jau-Ho, Yu-Ching Fang, Steve X. Dai, and David L. Wilcox. "Sintering of a Crystallizable K2O–CaO–SrO–BaO–B2O3–SiO2 Glass with Titania Present." Journal of Materials Research 17, no. 7 (July 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

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12

Trakanprapai, Chavalit, Vincenzo Esposito, Silvia Licoccia, and Enrico Traversa. "Alternative Chemical Route to Mesoporous Titania From a Titanatrane Complex." Journal of Materials Research 20, no. 1 (January 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

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13

Venz, P. A., R. L. Frost, and J. T. Kloprogge. "Chemical properties of modified titania hydrolysates." Journal of Non-Crystalline Solids 276, no. 1-3 (October 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, and K. Niihara. "Titania Nanotubes Prepared by Chemical Processing." Advanced Materials 11, no. 15 (October 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, and Akiyoshi Osaka. "In Vitro Apatite-Forming Ability of Titania Films Depends on Their Substrates." Key Engineering Materials 330-332 (February 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

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16

Elghniji, Kais, Mohamed Saad, Manel Araissi, Elimame Elaloui, and 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, no. 4 (December 1, 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

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17

Liu, Peng, Huanrong Li, Yige Wang, Binyuan Liu, Wenjun Zhang, Yanji Wang, Weidong Yan, Hongjie Zhang, and Ulrich Schubert. "Europium complexes immobilization on titania via chemical modification of titanium alkoxide." Journal of Materials Chemistry 18, no. 7 (2008): 735. http://dx.doi.org/10.1039/b717864f.

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18

Ahmad, Imteyaz, Subramshu Bhattacharya, and Horst Hahn. "In-situ nitrogen doping and boron modification of nanocrystalline titania powders by chemical vapour synthesis." Processing and Application of Ceramics 3, no. 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 re

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19

Grigorieva, Anastasia V., Valentina V. Yuschenko, Irina I. Ivanova, Eugene A. Goodilin, and 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 sod

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20

Shin, Euisup S., Ill Yong Kim, Sung Baek Cho, and Chikara Ohtsuki. "Inhibitory Effects of Doped Aluminum and Silicon on HAp-Forming Ability of Titania in Simulated Body Fluid." Key Engineering Materials 529-530 (November 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 g

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21

Yabe, S., Kanji Tsuru, Satoshi Hayakawa, Akiyoshi Osaka, Y. Yoshida, K. Suzuki, and T. Kuboki. "Cell Proliferation on Titania Layer with In Vitro Apatite Forming Ability." Key Engineering Materials 330-332 (February 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 o

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22

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

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23

Sun, Tao, and 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 (June 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

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24

Sakurada, Osamu, Mizuki Komaba, Seizo Obata, Minoru Hashiba, and Yasutaka Takahashi. "Electrophoretic Deposition on Anodes from Aqueous Titania Suspensions with Titanate Solution." Key Engineering Materials 412 (June 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 we

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25

Galstyan, Vardan, Elisabetta Comini, Camilla Baratto, Andrea Ponzoni, Matteo Ferroni, Nicola Poli, Elza Bontempi, Mariangela Brisotto, Guido Faglia, and Giorgio Sberveglieri. "Large surface area biphase titania for chemical sensing." Sensors and Actuators B: Chemical 209 (March 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, and Koichi Niihara. "ChemInform Abstract: Titania Nanotubes Prepared by Chemical Processing." ChemInform 31, no. 2 (June 11, 2010): no. http://dx.doi.org/10.1002/chin.200002255.

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Leboda, R., V. M. Gun'ko, M. Marciniak, A. A. Malygin, A. A. Malkin, W. Grzegorczyk, B. J. Trznadel, E. M. Pakhlov, and E. F. Voronin. "Structure of Chemical Vapor Deposition Titania/Silica Gel." Journal of Colloid and Interface Science 218, no. 1 (October 1999): 23–39. http://dx.doi.org/10.1006/jcis.1999.6411.

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Wang, LuYan, YanPing Sun, and BingShe Xu. "Surface chemical structure of titania-silica nanocomposite powder." Science Bulletin 53, no. 19 (September 28, 2008): 2964–72. http://dx.doi.org/10.1007/s11434-008-0427-x.

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Sekino, Tohru, Takumi Okamoto, Tomoko Kasuga, Takafumi Kusunose, Tadachika Nakayama, and Koichi Niihara. "Synthesis and Properties of Titania Nanotube Doped with Small Amount of Cations." Key Engineering Materials 317-318 (August 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 nanotube

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Tong, Zhenwei, Yanjun Jiang, Dong Yang, Jiafu Shi, Shaohua Zhang, Chuang Liu, and Zhongyi Jiang. "Biomimetic and bioinspired synthesis of titania and titania-based materials." RSC Advances 4, no. 24 (2014): 12388. http://dx.doi.org/10.1039/c3ra47336h.

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

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

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Tashiro, Yuichiro, Satoshi Komasa, Akiko Miyake, Hiroshi Nishizaki, and 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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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 exhibit

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Yeh, C. L., S. H. Yeh, and H. K. Ma. "Flame synthesis of titania particles from titanium tetraisopropoxide in premixed flames." Powder Technology 145, no. 1 (July 2004): 1–9. http://dx.doi.org/10.1016/j.powtec.2004.04.042.

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Akhtar, M. Kamal, Yun Xiong, and Sotiris E. Pratsinis. "Vapor synthesis of titania powder by titanium tetrachloride oxidation." AIChE Journal 37, no. 10 (October 1991): 1561–70. http://dx.doi.org/10.1002/aic.690371013.

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Santillán, M. J., Nancy E. Quaranta, F. Membrives, Judith A. Roether, and Aldo Roberto Boccaccini. "Processing and Characterization of Biocompatible Titania Coatings by Electrophoretic Deposition." Key Engineering Materials 412 (June 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 t

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Zu, Guoqing, Jun Shen, Wenqin Wang, Liping Zou, Ya Lian, and Zhihua Zhang. "Silica–Titania Composite Aerogel Photocatalysts by Chemical Liquid Deposition of Titania onto Nanoporous Silica Scaffolds." ACS Applied Materials & Interfaces 7, no. 9 (February 27, 2015): 5400–5409. http://dx.doi.org/10.1021/am5089132.

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Al-Shafei, Mansour A., Ahmed K. Al-Asseel, Abdulhadi M. Adab, Hasan A. Al-Jama, Amer A. Al-Tuwailib, and Shouwen X. Shen. "Deactivation Mechanism of Titania Catalyst." Journal of Materials Science Research 5, no. 4 (August 27, 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

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Mahu, Elvira, Cristina Giorgiana Coromelci, Doina Lutic, Iuliean Vasile Asaftei, Liviu Sacarescu, Valeria Harabagiu, and Maria Ignat. "Tailoring Mesoporous Titania Features by Ultrasound-Assisted Sol-Gel Technique: Effect of Surfactant/Titania Precursor Weight Ratio." Nanomaterials 11, no. 5 (May 11, 2021): 1263. http://dx.doi.org/10.3390/nano11051263.

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Abstract (sommario):

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 crystallinit

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40

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

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Abstract (sommario):

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, and Zhen-Sheng Jin. "Raman study of titania nanotube by soft chemical process." Journal of Molecular Structure 749, no. 1-3 (July 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, no. 10 (September 5, 2005): 103108. http://dx.doi.org/10.1063/1.2035874.

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43

Seifried, S., M. Winterer, and H. Hahn. "Nanocrystalline Titania Films and Particles by Chemical Vapor Synthesis." Chemical Vapor Deposition 6, no. 5 (October 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, and M. Picquart. "Molybdophosphoric acid in sol–gel titania: Physico-chemical properties." Applied Surface Science 252, no. 3 (October 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, and G. E. Thompson. "Crystallization of anodic titania on titanium and its alloys." Corrosion Science 45, no. 9 (September 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, and Xianghai An. "Effect of titanium and titania on chemical characteristics of hydroxyapatite plasma-sprayed into water." Materials Science and Engineering: C 26, no. 1 (January 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, and Yuan-Yao Li. "Preparation of Visible-Light-Responsive Nitrogen-carbon Co-doped Titania by Chemical Vapor Deposition." Zeitschrift für Physikalische Chemie 224, no. 06 (July 1, 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 cont

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48

Mogal, Sajid I., Manish Mishra, Vimal G. Gandhi, and Rajesh J. Tayade. "Metal Doped Titanium Dioxide: Synthesis and Effect of Metal Ions on Physico-Chemical and Photocatalytic Properties." Materials Science Forum 734 (December 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, L

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49

De, Nilanjan. "On Molecular Topological Properties of TiO2 Nanotubes." Journal of Nanoscience 2016 (November 23, 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, and Budi Setiawan. "Anatase TiO₂ Enrichment from Bangka Ilmenite (FeTiO₃) and its Photocatalytic Test on Degradation of Congo Red." Advanced Materials Research 789 (September 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 ammo

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