Morphology and dispersion control of titania–silica monolith with macro–meso pore system

Ruzimuradov, Olim; Nurmanov, Suvon; Kodani, Yumi; Takahashi, Ryōji; Yamada, Ikuya

doi:10.1007/s10971-012-2903-7

Cited by 17 publications

(19 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…observed comparable results with values that increased from 471 m 2 g −1 for silica to 712 m 2 g −1 with the incorporation of 7.75 wt % TiO 2 in the silica network. They found mesopore diameters of 2.5 nm 21. These samples are most likely comparable to the Si/Ti=35:1 (2.9 mol % Ti, 3.9 wt % TiO 2 ) sample, which shows also high specific surface areas (582 m 2 g −1 ), but higher mesopore volumes and pore diameters (4.1 nm) are achieved with EGMS and the SSP.…”

Section: Resultsmentioning

confidence: 76%

“…for silica‐based monoliths 6. 21 When titanium alkoxides were used as precursors, large micrometer‐sized TiO 2 domains were observed. The modification of the Ti precursor with acetylacetone allowed a homogeneous dispersion of titanium on the micrometer scale.…”

Section: Introductionmentioning

confidence: 99%

“…The modification of the Ti precursor with acetylacetone allowed a homogeneous dispersion of titanium on the micrometer scale. However, no further information on the homogeneity of the materials at the nanometer length scale was given 21…”

Section: Introductionmentioning

confidence: 99%

“…Many reports can be found in which mesoporous monoliths (xerogels and aerogels) have been prepared by one of the strategies discussed above. [11,15,16,19] To the best of our knowledge, the only report on macro-and mesoporous silica-titania monoliths was published recently by Ruzimuradov et al [21] They reacted tetraethyl orthosilicate and different Ti precursors in the presence of a phase-separation inducing agent (PEO) following a procedure that was developed by Nakanishi et al for silica-based monoliths. [6,21] When titanium alkoxides were used as precursors, large micrometer-sized TiO 2 domains were observed.…”

Section: Introductionmentioning

confidence: 99%

“…However, no further information on the homogeneity of the materials at the nanometer length scale was given. [21] Herein, we aim to follow an approach previously developed in our group for the synthesis of silica monoliths with a cellular macroporous network comprising a 2D hexagonal mesopore arrangement. [5,[22][23][24][25] Here, water-soluble glycolated silanes were applied, which show a high compatibility with lyotropic surfactant phases and still induce phase separation at a macroscopic length scale.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Hierarchically Organized Silica–Titania Monoliths Prepared under Purely Aqueous Conditions

Flaig

Akbarzadeh

Dolcet

et al. 2014

Chemistry A European J

View full text Add to dashboard Cite

Hierarchically organized silica-titania monoliths were synthesized under purely aqueous conditions by applying a new ethylene glycol-modified single-source precursor, such as 3-[3-{tris(2-hydroxyethoxy)silyl}propyl]acetylacetone coordinated to a titanium center. The influence of the silicon- and titanium-containing single-source precursor, the novel glycolated organofunctional silane, and the addition of tetrakis(2-hydroxyethyl)orthosilicate on the formation of the final porous network was investigated by SEM, TEM, nitrogen sorption, and SAXS/WAXS. In situ SAXS measurements were performed to obtain insight into the development of the mesoporous network during sol-gel transition. IR-ATR, UV/Vis, XPS, and XAFS measurements showed that up to a Si/Ti ratio of 35:1, well-dispersed titanium centers in a macro-/mesoporous SiO2 network with a specific surface area of up to 582 m(2) g(-1) were obtained. An increase in Ti content resulted in a decrease in specific surface area and a loss of the cellular character of the macroporous network. With a 1:1 Si/Ti ratio, silica-titania powders with circa 100 m(2) g(-1) and anatase domains within the SiO2 matrix were obtained.

show abstract

Section: Resultsmentioning

confidence: 76%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Hierarchically Organized Silica–Titania Monoliths Prepared under Purely Aqueous Conditions

Flaig

Akbarzadeh

Dolcet

et al. 2014

Chemistry A European J

View full text Add to dashboard Cite

show abstract

Functional (Meso)Porous Nanostructures

Feinle

Hüsing

2015

The Sol‐Gel Handbook

View full text Add to dashboard Cite

Anatase–silica composite aerogels: a nanoparticle-based approach

Heiligtag

Kränzlin

Süess

et al. 2013

J Sol-Gel Sci Technol

View full text Add to dashboard Cite

Herein we present the synthesis of anatasesilica aerogels based on the controlled gelation of preformed nanoparticle mixtures. The monolithic aerogels with macroscopic dimensions show large specific surface areas, and high and uniform porosities. The major advantage of such a particle-based approach is the great flexibility in pre-defining the compositional and structural features of the final aerogels before the gelation process by fine-tuning the properties of the titania and silica building blocks (e.g., size, composition and crystallinity) and their relative ratio in the dispersion. Specific surface functionalization enables control over the interaction between the nanoparticles and thus over their distribution in the aerogel. Positively charged titania nanoparticles are co-assembled with negatively charged Stoeber particles, resulting in a binary aerogel with a crystalline anatase and amorphous silica framework directly after supercritical drying without any calcination step. Titania-silica aerogels combine the photocatalytic activity of the anatase nanoparticles with the extensive silica chemistry available for silica surface functionalization.

show abstract

Morphology and dispersion control of titania–silica monolith with macro–meso pore system

Cited by 17 publications

References 37 publications

Hierarchically Organized Silica–Titania Monoliths Prepared under Purely Aqueous Conditions

Hierarchically Organized Silica–Titania Monoliths Prepared under Purely Aqueous Conditions

Functional (Meso)Porous Nanostructures

Anatase–silica composite aerogels: a nanoparticle-based approach

Contact Info

Product

Resources

About