Mesoporous structure and phase transition of nanocrystalline TiO2

Zhang, Yuhong; Weidenkaff, Anke; Reller, A.

doi:10.1016/s0167-577x(01)00597-3

Cited by 91 publications

(41 citation statements)

References 15 publications

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“…Thermal properties of rutile (TiO 2 ) have been extensively studied experimentally. Phase transitions from and to rutile have been investigated by many researchers [7][8][9][10][11][12][13][14][15]. The coefficient of thermal expansion (CTE) have been reported by Krishna Rao et al [16], Sugiyama and Takéuchi [17] and Henderson et al [18].…”

Section: Introductionmentioning

confidence: 99%

Pressure–temperature dependence of thermodynamic properties of rutile (TiO2): A first-principles study

Kangarlou

Abdollahi

2015

Pramana - J Phys

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Ab-initio calculations of thermal properties of rutile (TiO 2 ) have been performed by using the projector augmented-wave (PAW) method within the generalized gradient approximation (GGA). Both pressure-and temperature-dependent thermodynamic properties such as the bulk modulus, thermal expansion, thermal expansion coefficient, heat capacity at constant volume and constant pressure were calculated using two different models based on the quasiharmonic approximation (QHA): the Debye-Slater and Debye-Grüneisen model with Dugdale-MacDonald (DM) approximation. Also, the empirical energy corrections were applied to the results to correct the systematic errors introduced by the functional. It is found that the Debye-Grüneisen model provides more accurate estimates than the Debye-Slater models, especially after empirical energy correction.

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Section: Introductionmentioning

confidence: 99%

Pressure–temperature dependence of thermodynamic properties of rutile (TiO2): A first-principles study

Kangarlou

Abdollahi

2015

Pramana - J Phys

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“…Mesoporous materials [1][2][3][4][5][6] synthesized using molecular self-assemblies of surfactants as the structure directing agents have highly ordered pore structures with high surface area and these have attracted attention in terms of the possible application to high performance catalysts, adsorbents and separating materials. The synthesis of mesoporous materials with various pore structures [7,8], morphology [9,10] and inorganic walls bearing catalytic activities [11][12][13][14] have been widely studied.…”

Section: Introductionmentioning

confidence: 99%

Fabrication and Pore Size Control of Large-Pore Mesoporous Silica Particles through a Solvent Evaporation Process

Shibata

Ogura

Nishio

et al. 2011

Silicon

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Large-pore mesoporous silica particles were synthesized through a solvent evaporation process using hydrophobic fumed silica particles and tetraethyl orthosilicate (TEOS) as silica sources. The solvent evaporation of an ethanol solution of fumed silica particles, TEOS, HCl and triblock copolymer (F127) resulted in mesoporous silica particles with pores with sizes of about 7 nm. In addition, the interplanar spacing of the mesoporous silica particles can be controlled by changing the solvent evaporation temperatures.

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“…Recently, use of cavitation in the synthesis process has yielded smaller particle size for a variety of oxides. Zhang and Reller (2002) demonstrated that some properties of pure and doped titania are very sensitive to changes in crystallinity. Besides the crystalline structure, particle size and surface area strongly influence catalytic activity.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of mesoporous titania in rutile phase with pore-stable structure

Santos

Ogasawara

Corrêa

2009

Braz. J. Chem. Eng.

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-Metastable-to-stable transformation in oxides is always associated with drastic reduction in surface area and/or porosity. Therefore, all earlier efforts to stabilize the pore structure of oxides undergoing a metastable-to-stable phase transformation are interesting for both scientific and technological concerns. This work presents a new experimental technique for catalytic oxide production through sonication in acid solution for attainment of the anatase-rutile transformation. Mesoporous structure of titania and surface area were stabilized in the rutile phase after calcinations at 430 and 730 o C. Analysis by scanning electron microscopy (SEM) and nitrogen isotherms showed that the mesoporous structure was preserved after calcinations. After the sonication of titania for 32 hours, rutile phase was obtained at 730 o C and still kept a surface area of 28m 2 /g. When sonicated for 64 h, rutile was obtained at 430 o C, still preserving an area of 52m 2 /g.

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Mesoporous structure and phase transition of nanocrystalline TiO2

Cited by 91 publications

References 15 publications

Pressure–temperature dependence of thermodynamic properties of rutile (TiO2): A first-principles study

Pressure–temperature dependence of thermodynamic properties of rutile (TiO2): A first-principles study

Fabrication and Pore Size Control of Large-Pore Mesoporous Silica Particles through a Solvent Evaporation Process

Synthesis of mesoporous titania in rutile phase with pore-stable structure

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