Results 251 to 260 of about 35,646 (293)

Steps on anatase TiO2(101)

Nature Materials, 2006
Surface defects strongly influence the surface chemistry of metal oxides, and a detailed picture of defect structures may help to understand reactivity and overall materials performance in many applications. We report first-principles calculations of step edges, the most common intrinsic defects on surfaces (and probably the predominant ones on ...
Xue-Qing, Gong, Annabella, Selloni, Matthias, Batzill, Ulrike, Diebold   +3 more
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Photoluminescence study on defects in pristine anatase and anatase-based composites

Physica B: Condensed Matter, 2003
Under 325 nm laser light irradiation at room temperature in oxygen gas, the photoluminescence (PL) intensity of pristine anatase TiO 2 decreases considerably and then it recovers reversibly with the same laser light irradiation at room temperature in vacuum. This result gives important information on the oxygen defects at anatase particle surfaces and
Shosuke Mochizuki, Takashi Shimizu, Fumito Fujishiro   +2 more
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Preparation and characterization of anatase powders

Journal of the Chemical Society, Faraday Transactions, 1998
Anatase powders have been prepared by precipitation and by sol–gel methods. In the former, titania was continuously precipitated at 25°C, pH 1.97 in a stirred reactor by mixing TiOSO4 and potassium hydroxide so as to keep solution supersaturation constant throughout the precipitation process.
Tsevis, A., Spanos, N., Koutsoukos, P.G., van der Linde, A.J., Lyklema, J.   +4 more
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The anatase-rutile transition. Part 1.—Kinetics of the transformation of pure anatase

Trans. Faraday Soc., 1958
Using spectroscopically pure anatase, the transition to rutile was investigated by means of X-ray spectra. Below 610°C the transition is immeasurably slow; above 730°C it occurs extremely rapidly. The conversion is second-order with respect to remaining anatase, and is characterized by an activation energy of ca. 100 Kcal/mole.
A. W. Czanderna, C. N. Ramachandra Rao, J. M. Honig   +2 more
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Bulk modulus of anatase

Journal of Physics and Chemistry of Solids, 2001
Room-temperature volume versus pressure data of anatase was obtained from X-ray diffraction measurements in a diamond anvil cell up to 7.8 GPa. A fit of the pressure-volume data to a Birch-Murnaghan equation of state with an assumed pressure derivative K'
V. Swamy, L.S. Dubrovinsky
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The Hamaker constant of anatase aqueous suspensions

Journal of Colloid and Interface Science, 2007
The linear relationship of the yield stress with the square zeta potential may be used to determine the Hamaker constants in suspensions. In this work we have obtained the Hamaker constant for the attractive forces between anatase particles in aqueous suspensions using this method and compared them with those obtained by contact angle measurement.
A I, Gómez-Merino, F J, Rubio-Hernández, J F, Velázquez-Navarro, F J, Galindo-Rosales, P, Fortes-Quesada   +4 more
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Hydration and Thermal Expansion in Anatase Nanoparticles

Advanced Materials, 2016
A tunable thermal expansion is reported in nanosized anatase by taking advantage of surface hydration. The coefficient of thermal expansion of 4 nm TiO2 along a-axis is negative with a hydrated surface and is positive without a hydrated surface. High-energy synchrotron X-ray pair distribution function analysis combined with ab initio calculations on ...
He, Zhu, Qiang, Li, Yang, Ren, Longlong, Fan, Jun, Chen, Jinxia, Deng, Xianran, Xing   +6 more
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Li sites and phase stability in TiO2-anatase and Zr-doped TiO2-anatase

Journal of Materials Chemistry, 2006
The phase stability of Zr-doped Li-anatase has been studied for a wide range of Li concentrations using density functional theory calculations of representative ordered structures. Thermodynamically stable structures have been established through the full relaxation of the internal coordinates and the size and shape of the periodic unit cell.
Marina V. Koudriachova, N. M. Harrison
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UV Reflection Spectra of Anatase TiO2

Journal of Electron Spectroscopy and Related Phenomena, 1996
Abstract The polarized reflection spectra of anatase TiO 2 single crystals are measured in the photon energy range from 2 to 30 eV using the synchrotron orbital radiation in ISSP. The optical absorption coefficient is obtained from the reflection spectra by Kramers-Kronig analysis.
Noriko Hosaka, Takao Sekiya, Masami Fujisawa, Chikatoshi Satoko, Susumu Kurita   +4 more
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A Saga of Wormholes and Anatase

Science, 2005
Maps, Myths, and Men The Story of the Vinland Map . By Kirsten A. Seaver . Stanford University Press, Palo Alto, CA, 2004. 504 pp. $65, £44.50. ISBN 0-8047-4962-0. Paper, $24.95, £17.50. ISBN: 0-8047-4963-9.
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