We propose a distribution kinetics model for the polymorphic transformation (anatase to rutile) and coarsening of TiO 2. Based on population balance equations for the size distributions of the dimorphs, the simplified model applies a first-order rate expression for transformation combined with Smoluchowski coalescence for coarsening of anatase and rutile particles. Two moments of the size ...
about 30% lower than that of the anatase ﬁlm.24 The researchers attributed the lower photocurrent of the rutile ﬁlm to a lesser amount of adsorbed dye due to a smaller surface area per unit
Phase-pure TiO 2 nanocrystallites with narrow particle-size distributions were selectively prepared by hydrothermal processes starting from amorphous TiO 2.
Nonaqueous reactions between titanium(IV) chloride and alcohols (benzyl alcohol or n-butanol) were used for the synthesis of anatase TiO2 particles, while rutile TiO2 particles were synthesized in ...
intercalation properties for anatase, rutile, and TiO 2 (B). The magnitude of GGA intercalation voltage underestimation is shown to vary depending on the polymorphs. We ﬁnd that Li intercalation is most energetically preferred in anatase, while Na intercalation is most feasible for TiO 2 (B). Using the screened exchange hybrid functional, all intercalation processes are shown to be ...
Optical properties of anatase and rutile TiO 2 studied by GGA+U Li Jinping 1-3,, Meng Songhe, Qin Liyuan1, Hantao Lu2 (1 Center for Composite Materials and Structures, Harbin Institute of Technology, Harbin 150080, China)
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anatase and rutile phases for TiO2 thin films deposited by a d.c. magnetron sputtering system. Fig. 3 – The non-linear I–V characteristics for TiO2 films. Table 1 Differences in electrical properties for anatase and rutile phases Properties Rutile Anatase Static dielectric constant ~ 100 ~ 30 Thermally activation energy ~ 1,5 eV ~ 0,7 eV Carrier effective mass ~ 20 mo ~1 mo According to ...
2014-02-10· Anatase has a larger band gap than rutile TiO 2. While this reduces the light that can be absorbed, it may raise the valence band maximum to higher energy levels relative to redox potentials of adsorbed molecules.
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Anatase, rutile, and TiO 2 (B) have all been examined for their potential application in Li- and Na-based battery materials, and a wide range of results has been reported. It has been experimentally conﬁrmed that anatase can readily incorporate Li.5,8−10 For Na, however, the situation is not as clear and is dependent on the TiO 2 nanostructure. Xiong et al. 11 tested nanowire TiO 2 grown ...
Titanium dioxide, also known as titanium(IV) oxide or titania, is the naturally occurring oxide of titanium, chemical formula TiO 2. When used as a pigment, it is called titanium white, Pigment White 6 …
To magnify anatase/rutile phase junction effects through appropriate Au decorations, a facile solution-based approach was developed to synthesize Au/TiO 2 nanoforests with controlled Au locations.
Rutile vs Anatase Titanium Dioxide: Rutile titanium dioxide or commonly rutile is a mineral that primarily has TiO 2 with a deep red appearance. Anatase titanium dioxide is a form of TiO 2 that has an appearance with yellow to blue color.
high quality anatase and rutile grades for paint, paper, plastics, fibers, inks and food
Anatase nanoparticles were obtained using acetic acid, while phase-pure rutile and brookite nanoparticles were obtained with hydrochloric acid at a different concentration. The
Phase Characterization of TiO 2 Powder by XRD and TEM Kheamrutai Thamaphat 1*, Pichet Limsuwan1 and Boonlaer Ngotawornchai2 ABSTRACT In this study, the commercial TiO 2 nanopowder and micropowder of anatase phase and rutile phase have been characterized by x-ray diffraction (XRD) and transmission electron microscopy (TEM). XRD patterns of nano-TiO 2 in rutile and anatase phases …
Abstract. Titanium dioxide, TiO 2, is an important photocatalytic material that exists as two main polymorphs, anatase and rutile. The presence of either or both of these phases impacts on the photocatalytic performance of the material.
For instance, the commercial photocatalyst TiO 2-P25 (Degussa-Huls) is composed of anatase and rutile phases and exhibits relatively good photocatalytic activity, which is associated with good charge separation at the interface of the rutile and anatase phases [10,11].
Metal oxides, such as TiO 2, are often used as photocatalysts in pollutant removal, water-splitting, or chemical synthesis. Multi-component photocatalyst materials can be more photoactive than
Review of the anatase to rutile phase transformation ... initial crystalline TiO 2 phase formed is generally anatase [82, 83]. From a structural perspective, this could be due to the greater ease of the short-range ordered TiO 6 octahedra in arranging into long-range ordered anatase structure owing to the less-constrained molecular construction of anatase relative to rutile . Alternatively ...
Anatase is one of the three mineral forms of titanium dioxide, the other two being brookite and rutile. It is always found as small, isolated and sharply developed crystals, and like rutile, a more commonly occurring modification of titanium dioxide, it crystallizes in the tetragonal system.
For example, Hsieh et al. obtained both anatase and rutile TiO 2 on SrTiO 3 substrates, but while the anatase phase was deposited directly on the substrate, the rutile phase was grown by oxidizing titanium nitride films  .
In 1991, Bickley et al. proposed a synergetic effect between anatase and rutile in Degussa P25. Since then, there has been an intensive debate about the correctness of this proposal, the origin of the synergism, and the right polymorph composition.
Brookite and anatase are thermodynamically less stable than rutile. Heating the films at a temperature near 900°C converts them to rutile phase . In contrast to the extensive studies on the rutile phase, very little is known about
In general, anatase TiO 2 exhibits higher photocatalytic activities than rutile TiO 2. However, the reasons for the differences in photocatalytic activity between anatase and rutile are still being debated.
We report on the synthesis of phase-pure TiO 2 nanoparticles in anatase, rutile and brookite structures, using amorphous titania as a common starting material.