Results 121 to 130 of about 1,843 (177)

Photocatalytic activity of nanocrystalline TiO2 (brookite, rutile and brookite-based) powders prepared by thermohydrolysis of TiCl4 in aqueous chloride solutions

Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2008
Abstract Nanocrystalline TiO2 powders were synthesized by thermohydrolysis of TiCl4 in HCl or NaCl aqueous solutions. Rutile, mixtures of brookite and rutile or mixtures of anatase, brookite and rutile were obtained depending on the acidity of the medium. Crystalline phases and composition of the mixtures were identified by using XRD analysis.
Riccardo Ceccato, Leonardo Palmisano, Marianna Bellardita   +2 more
exaly   +3 more sources

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Brookite TiO2 nanoflowers

Chemical Communications, 2009
Pure brookite TiO(2) nanoflowers consisting of single crystalline nanorods were synthesized for the first time using a facile one-step hydrothermal process.
Bin, Zhao, Feng, Chen, Qiwei, Huang, Jinlong, Zhang   +3 more
openaire   +2 more sources

Hydrothermal Synthesis of Brookite

Chemistry Letters, 1999
Abstract Hydrothermal synthesis of brookite was performed at 110-200 °C within 24 h using amorphous TiO2 and sodium salts as the starting material. Brookite was obtained as an almost single phase at 200 °C and TiO2 / NaOH mole ratio ≅ 1.
Takako Nagase, Takeo Ebina, Takashi Iwasaki, Hiromichi Hayashi, Yoshio Onodera, Maya Chatterjee   +5 more
openaire   +1 more source

Brookite-type TiO2 nanotubes

Chemical Communications, 2008
Brookite-type TiO(2) nanotubes with crystalline multilayer walls have been synthesized for the first time via a simple hydrothermal route.
Qixin, Deng, Mingdeng, Wei, Xiaokun, Ding, Lilong, Jiang, Binghuo, Ye, Kemei, Wei   +5 more
openaire   +2 more sources

Brookite, the Least Known TiO2 Photocatalyst [PDF]

Catalysts, 2013
Brookite is the least studied TiO2 photocatalyst due to the difficulties usually encountered in order to obtain it as a pure phase. In this review, a comprehensive survey of the different methods available for preparing brookite powders and films is reported.
Leonardo Palmisano, Marianna Bellardita, Palmisano Leonardo   +2 more
exaly   +2 more sources

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
Godlisten Shao, Bridget Mutuma, Hee Taik Kim   +2 more
exaly   +3 more sources

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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On Brookite Crystals in the Dogger

Geological Magazine, 1938
In the course of work in collaboration with Dr. J. E. Hemingway on the petrography of the Dogger of North-East Yorkshire it has been found that brookite is widely distributed as a “heavy mineral” constituent in several different kinds of sediment. This is in agreement with results obtained earlier by myself alone in the study of sandstones from higher ...
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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 ...
Leonardo Palmisano, Marianna Bellardita, A Di Paola   +2 more
exaly   +2 more sources

Controlled synthesis of brookite and combined brookite with rutile phases of titanium di-oxide and its characterization studies

Ceramics International, 2017
Abstract Experimental conditions for the sol-gel synthesis of TiO 2 were modified by using Polyethylene glycol (PEG) as well as an addition of acid catalyst. Synthesis of brookite and mixed brookite with rutile was obtained. X-ray powder diffraction and Micro Raman measurements confirmed the crystallization of brookite while using pure PEG 4000 ...
S Vinoth, T Arun
exaly   +2 more sources