Results 171 to 180 of about 9,726 (203)

Sol–gel synthesis of mesoporous anatase–brookite and anatase–brookite–rutile TiO2 nanoparticles and their photocatalytic properties

Journal of Colloid and Interface Science, 2015
TiO2 photocatalysts with a mixture of different TiO2 crystal polymorphs have customarily been synthesized hydrothermally at high temperatures using complicated and expensive equipment. In this study TiO2 nanoparticles with a mixture of TiO2 crystals were synthesized using a modified sol-gel method at low temperature. In order to form nanoparticles with
Bridget K, Mutuma, Godlisten N, Shao, Won Duck, Kim, Hee Taik, Kim   +3 more
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Preparation of photocatalytic brookite thin films

Thin Solid Films, 2007
Pure brookite films were deposited from a brookite dispersion obtained by peptizing a mixture brookite–rutile prepared by thermolysis of TiCl4 in a HCl solution. The films were characterised by X-ray diffraction and Raman spectroscopy. The photoactivity of the samples was tested by using the photo-oxidation of 2-propanol in gas–solid regime as a probe ...
A. Di Paola, M. Addamo, M. Bellardita, E. Cazzanelli, L. Palmisano   +4 more
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Studies on the brookite-rutile transformation

Transactions of the Faraday Society, 1961
Brookite, the orthorhombic modification of titanium dioxide, transforms to the tetragonal modification, rutile, on heating. The kinetics and energetics of the transformation have been studied. Below 715±10°C, the rate of transformation is extremely slow. There appears to be little or no induction time.
Rao, CNR, Yoganarasimhan, SR, Faeth, PA
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A novel multilayer brookite TiO2 electrode for improved performance of pure brookite-based dye sensitized solar cells

Chemical Physics Letters, 2020
Abstract A novel multilayer brookite TiO2 film-based dye-sensitized solar cell (DSSCs) is proposed and prepared by three kinds of brookite TiO2 nanoparticles. By optimizing the structure of multilayer brookite TiO2 electrode, the optimal photovoltaic conversion efficiency of multilayer brookite-based solar cell could reach to 8.16%, which is much ...
Tingxin Peng, Jinlei Xu, Rong Chen
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Spinel lithium titanate from brookite nanocrystallites

Ceramics International, 2014
Abstract Spinel lithium titanate nanoparticles have been synthesized using anatase and brookite nanocrystallites, as precursors. The corresponding products, A- and B-Li 4 Ti 5 O 12 nanoparticles, have distinct differences in the optical absorption property, electrochemical performance and photocatalytic activity.
Xiangdong Meng, Xiaocen Wang, Yuxue Zhou, Ling Tong, Xianghua Zeng, Xiaobing Chen   +5 more
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Comparative study of photoinduced wettability conversion between [PW12O40]3−/brookite and [SiW12O40]4−/brookite hybrid films

Materials Chemistry and Physics, 2014
Two tungsten-based Keggin-type heteropolyacids (PW12: ([PW12O40]3−) and SiW12: ([SiW12O40]4−)) were hybridized with brookite-type TiO2. Then photocatalytic decomposition activity, photoinduced hydrophilicity, and sustainability of the hydrophilicity in the dark were evaluated using gaseous 2-propanol (IPA) decomposition and sessile drop method.
Kunchaya Pruethiarenun, Toshihiro Isobe, Sachiko Matsushita, Jinhua Ye, Akira Nakajima   +4 more
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Non-classical growth of brookite nanorods

CrystEngComm, 2019
Under hydrothermal conditions, the formation of the brookite phase occurs due to the oriented attachment of anatase particles with subsequent recrystallization.
Irina V. Kolesnik, Daniil A. Kozlov, Anton S. Poluboyarinov, Alexey V. Garshev, Vladimir K. Ivanov   +4 more
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Hydrothermal Preparation of Nanosized Brookite Powders

Journal of the American Ceramic Society, 2000
Titania powders in pure brookite form were synthesized by hydrothermal treatment of titanium(IV) salt solutions. Two kinds of starting materials, titanium sulfate and titanium tetrachloride, were used in the hydrothermal reactions. The effects of preparation conditions on the polymorphous form and morphology of the titanium dioxide powders were studied.
Yanqing Zheng, Erwei Shi, Suxian Cui, Wenjun Li, Xingfang Hu   +4 more
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Zur hydrothermalen Synthese von Brookit

Zeitschrift für anorganische und allgemeine Chemie, 1966
AbstractUntersuchungen des Kristallisationsverhaltens von amorphem TiO2 unter hydrothermalen Bedingungen bei Temperaturen bis 600°C und Drucken bis 1000 atm ermöglichten die Darstellung von Brookit in Gegen wart von NaOH als Lösungsgenossen. Die Bildung von Brookit ist abhängig vom NaOH‐Gehalt der wäßrigen Lösung. Während im alkalifreien bzw.
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The optical absorption edge of brookite TiO2

Solid State Communications, 2006
Abstract The optical absorption edge of brookite TiO2 was measured at room temperature, using natural crystals. The measurements extend up to 3.54 eV in photon energy and 2000 cm−1 in absorption coefficient. The observed absorption edge is broad and extends throughout the visible, quite different from the steep edges of rutile and anatase.
R. Zallen, M.P. Moret
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