نتایج جستجو برای: anatase

تعداد نتایج: 2820  

2008
M. STAMATE M. Stamate G. Lazar I. Lazar

Anatase TiO2 thin films were deposited in a d.c. reactive magnetron sputtering system. It was found that there is a strong dependence between anatase-rutil structures of TiO2 films and the technological conditions, the most relevant parameter being the oxygen percentage from the argon and oxygen mixture. Our measurements carried out for electrical properties of d.c. magnetron sputtering TiO2 th...

2017
Volodymyr O. Kotsyubynsky Ivan F. Myronyuk Volodymyr L. Chelyadyn Andriy B. Hrubiak Volodymyr V. Moklyak Sofia V. Fedorchenko

The phenomenological model of sulphate anions effect on the nanodispersed titania synthesis during hydrolysis of titanium tetrachloride was studied. It was proposed that both chelating and bridging bidentate complexes formation between sulphate anions and octahedrally coordinated [Ti(OH)h(OH2)6-h](4-h)+ mononers is the determinative factor for anatase phase nucleation.

Journal: :Physical chemistry chemical physics : PCCP 2014
Jinfeng Zhang Peng Zhou Jianjun Liu Jiaguo Yu

In general, anatase TiO2 exhibits higher photocatalytic activities than rutile TiO2. However, the reasons for the differences in photocatalytic activity between anatase and rutile are still being debated. In this work, the band structure, density of states, and effective mass of photogenerated charge carriers for anatase, rutile and brookite TiO2 are investigated by the first-principle density ...

2013
David O. Scanlon Charles W. Dunnill John Buckeridge Stephen A. Shevlin Andrew J. Logsdail Scott M. Woodley C. Richard A. Catlow Michael. J. Powell Robert G. Palgrave Ivan P. Parkin Graeme W. Watson Thomas W. Keal Paul Sherwood Aron Walsh Alexey A. Sokol

The most widely used oxide for photocatalytic applications owing to its low cost and high activity is TiO2. The discovery of the photolysis of water on the surface of TiO2 in 19721 launched four decades of intensive research into the underlying chemical and physical processes involved2–5. Despite much collected evidence, a thoroughly convincing explanation of why mixed-phase samples of anatase ...

2012
Pradeepan Periyat Suresh C. Pillai Declan E. McCormack John Colreavy Steven J. Hinder

RECEIVED DATE (to be automatically inserted after your manuscript is accepted if required according to the journal that you are submitting your paper to) TITLE RUNNING HEAD 'Improved stability of anatase TiO 2 ' CORRESPONDING AUTHOR FOOTNOTE *[email protected] 2 ABSTRACT: Of the various forms of titania (anatase, rutile and brookite) anatase is found to be the best photocatalyst. Without any...

Journal: :Journal of nanoscience and nanotechnology 2010
Xiaoqiang Zhang Lihong Yin Meng Tang Yuepu Pu

The objective of the present study was to develop a practical method to prepare a stable dispersion of TiO2 nanoparticles for biological studies. To address this matter a variety of different approaches for suspension of nanoparticles were conducted. TiO2 (rutile/anatase) dispersions were prepared in distilled water following by treated with different ultrasound energies and various dispersion ...

Journal: :international journal of nanoscience and nanotechnology 2008
z. ahmadi sh. afshar l. vafaee a. salehi

in this work, tio2 /sio2 (pure anatase), and tio2 /sio2 (anatase/rutile) nano-photocatalysts are prepared by using sol-gel method and control of acidity. the particles size is calculated using scheerer, s equation and is estimated to be around 7-15 nm. in order to improve the photocatalytic activity of tio2 /sio2 ,1% (wt) platinum particles are loaded on both catalysts using photoreductive meth...

Journal: :The journal of physical chemistry. A 2007
Jee-Gong Chang Jenghan Wang M C Lin

This study investigates the adsorption and reactions of boron trichloride and its fragments (BClx) on the TiO2 anatase (101) and rutile (110) surfaces by first-principles calculations. The results show that the possible absorbates on the TiO2 anatase and rutile surfaces are very similar. The single- and double-site adsorption configurations are found for both anatase and rutile surfaces. The pa...

2015
Wei-Na Zhao Sheng-Cai Zhu Ye-Fei Li Zhi-Pan Liu

The heterophase solid–solid junction as an important type of structure unit has wide applications for its special mechanics and electronic properties. Here we present a first three-phase atomic model for the anatase–rutile TiO2 heterophase junction and determine its optical and electronic properties, which leads to resolution of the long-standing puzzles on the enhanced photocatalytic activity ...

Journal: :Nanoscale 2015
Changdong Chen Yasushi Ikeuchi Linfeng Xu Galhenage A Sewvandi Takafumi Kusunose Yasuhiro Tanaka Shunsuke Nakanishi Puhong Wen Qi Feng

[111]- and {010}-faceted anatase nanocrystals with controllable crystal size and morphology were synthesized from tri-titanate H2Ti3O7 nanosheets by hydrothermal reaction. The nanostructures and the formation reaction mechanism of the obtained TiO2 nanocrystals were investigated using XRD, FE-SEM, and TEM. Furthermore, the photocatalytic and dye-sensitized solar cell (DSSC) performances of the ...

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