Synthesis of Hexagonally Packed Mesoporous TiO<sub>2</sub> by a Modified Sol–Gel Method

Antonelli, David M.; Ying, Jackie Y.

doi:10.1002/anie.199520141

Cited by 1,088 publications

(630 citation statements)

References 14 publications

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“…Huang et al (2005) prepared mesoporous TiO 2 materials by the sol-gel process at room temperature using tetrabutyl titanate as the precursor in the absence of any templates. Antonelli and Ying (1995) synthesized mesoporous TiO 2 materials by a modified sol-gel method using phosphorus surfactants as templates. Pavasupree et al (2008) synthesized mesoporous anatase TiO 2 nanopowder by the hydrothermal method at 130ºC for 12h.…”

Section: Resultsmentioning

confidence: 99%

Temperature and reaction time effects on the structural properties of titanium dioxide nanopowders obtained via the hydrothermal method

Jahn

Carreño

Foletto

2011

Braz. J. Chem. Eng.

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-An investigation was carried out on the synthesis of titanium dioxide nanopowders via the hydrothermal method, examining the influence of temperature (150ºC and 200ºC) and reaction time (6 to 36 h). The resulting powders were characterized by X-ray diffraction, infrared absorption spectrophotometry, transmission electron micrographs and surface area. The X-ray diffraction revealed that there was formation of a pure crystalline phase, consisting only of anatase for all conditions of synthesis. Both temperature and reaction time proved to have a slight influence on the crystallite size (from 9 to 17 nm) and a significant influence on the surface area (from 86 to 168 m 2 .g -1 ).

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Section: Resultsmentioning

confidence: 99%

Temperature and reaction time effects on the structural properties of titanium dioxide nanopowders obtained via the hydrothermal method

Jahn

Carreño

Foletto

2011

Braz. J. Chem. Eng.

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“…Since the first report of mesoporous titania, [14] prepared by the well-documented surfactant templating strategy, [11,12] there has been a great deal of effort devoted to the use of different titania precursors (e.g., alkoxides, halides, acetylacetonates, nanoclusters, colloids) in the synthesis and experiments designed to unravel the structure, property, and function relations of this material. [15,16] Little work has been devoted to understanding the mode of formation of mesoporous titania [17±19] and elucidating the differences with respect to nanocrystalline titania.…”

Section: Introductionmentioning

confidence: 99%

Solventless Acid‐Free Synthesis of Mesostructured Titania: Nanovessels for Metal Complexes and Metal Nanoclusters

Dag¹,

Soten

Çelik

et al. 2003

Adv Funct Materials

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A new and highly reproducible method to obtain mesostructured titania materials is introduced in this contribution. The mesostructured titania is obtained by employing self‐assembled structures of non‐ionic alkyl‐poly(ethylene oxide) surfactants as templates. The materials are produced without additional solvents such as alcohols, or even water. Only the titanium(IV) ethoxide and the surfactant (C12EO10) are needed. Water, in the form of that attached to the surfactant and from the atmosphere, induces growth of titania nanoclusters in the synthesis sol. It is indicated that these nanoclusters interact with the surfactant EO‐head groups to form a new titanotropic amphiphile. The new amphiphiles self‐assemble into titanium nanocluster–surfactant hybrid lyotropic phases, which are transformed to the final mesostructured materials by further condensation of the titania network. The titania materials can be obtained also with noble‐metal particles immobilized in the mesostructured framework. It is seen that when different metal salts are used as the metal precursors, different interactions with the titania walls are found. The materials are characterized by X‐ray diffraction (XRD), polarization optical microscopy (POM), transmission electron microscopy (TEM), UV‐vis spectroscopy, and micro‐Raman analysis.

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“…Templated synthesis, invented in early 1990s for the synthesis of mesoporous silica or aluininosilicate [8,9] were also applied for this purpose. Successes have been achieved as various approaches, such as starting with metal alkoxides and conducting the synthesis in non-aqueous systems, were employed to overcome serious difficulties in the synthesis [20][21][22]. In comparison, the synthesis proposed in this study has a prominent advantage that it can be conducted in aqueous system at moderate conditions.…”

Section: Discussionmentioning

confidence: 99%

Molecular Engineered Porous Nanocomposites of Metal Oxide and Clay Using Surfactants

Zhu

2001

MRS Proc.

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A novel synthesis route of metal oxide nanoparticles dispersed in a silicate framework is reported here. This composite nanostructure is highly thermally stable and porous, rendering large surface area and rich surface chemistry promising for catalytic applications. Aqueous solutions of metal salts were used as the precursors of the nanoparticles, and added in an aqueous dispersion of synthetic clay, laponite, in which the clay exists in exfoliated silicate sheets. Acid leaching of the clay sheets occurs in the reaction due to the strong acidity of the metal salt solution. Meanwhile, the metal hydrate ions polymerise because of the high pH of the clay dispersion and condense on the leached silicates. This mechanism is distinctly different from conventional pillaring process. The nanocomposites of various oxides and binary oxides were synthesised. By introducing polyethylene oxide surfactants, we obtained mesoporous nanocomposites with very large surface areas (400-900 m2/g) and porosity. These nanocomposites are superior catalysts or catalyst supports over of microporous pillared clays [1-3] due to their structure and surface properties.

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Synthesis of Hexagonally Packed Mesoporous TiO₂ by a Modified Sol–Gel Method

Cited by 1,088 publications

References 14 publications

Temperature and reaction time effects on the structural properties of titanium dioxide nanopowders obtained via the hydrothermal method

Temperature and reaction time effects on the structural properties of titanium dioxide nanopowders obtained via the hydrothermal method

Solventless Acid‐Free Synthesis of Mesostructured Titania: Nanovessels for Metal Complexes and Metal Nanoclusters

Molecular Engineered Porous Nanocomposites of Metal Oxide and Clay Using Surfactants

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Synthesis of Hexagonally Packed Mesoporous TiO2 by a Modified Sol–Gel Method

Cited by 1,088 publications

References 14 publications

Temperature and reaction time effects on the structural properties of titanium dioxide nanopowders obtained via the hydrothermal method

Temperature and reaction time effects on the structural properties of titanium dioxide nanopowders obtained via the hydrothermal method

Solventless Acid‐Free Synthesis of Mesostructured Titania: Nanovessels for Metal Complexes and Metal Nanoclusters

Molecular Engineered Porous Nanocomposites of Metal Oxide and Clay Using Surfactants

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Synthesis of Hexagonally Packed Mesoporous TiO₂ by a Modified Sol–Gel Method