CVD-Titania on Fumed Silica Substrate

Gun'ko, V.М.; Zarko, V.I.; Туров, В.В.; Лебода, Р.; Chibowski, Emil; Hołysz, Lucyna; Pakhlov, E.M.; Воронин, Е. Ф.; Dudnik, V. V.; Gornikov, Yu. I.

doi:10.1006/jcis.1997.5270

Cited by 79 publications

(59 citation statements)

References 38 publications

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“…In accordance with the data of Gunko et al (1998) (Tanabe et al 1970) for the case when the titanium atom enters into the zirconia (see Figure 8).…”

Section: Nmsupporting

confidence: 90%

Design and Photocatalytic Activity of Mesoporous TiO₂/ZrO₂ Thin Films

Gnatyuk¹,

Smirnova²,

Eremenko³

et al. 2005

Adsorption Science & Technology

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ABSTRACT:Optically transparent, crack-free mesoporous titania and zirconiadoped titania thin films were fabricated by the sol-gel technique using the non-ionic amphiphilic triblock copolymer Pluronic P123 as the template. The structure and optical properties of these films were characterized using TEM, low-angle XRD, DTA/TG measurements, UV-vis spectroscopy and hexane adsorption investigations. It was found that addition of ZrO 2 into the TiO 2 matrix retarded sintering of the films, thereby increasing the specific surface area after treatment up to 500°C. The catalytic activity of the mesoporous TiO 2 and TiO 2 /(5-30%) ZrO 2 films in ethanol photo-oxidation increased with increasing specific surface area and surface acidity of the samples.

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“…In accordance with the data of Gunko et al (1998) (Tanabe et al 1970) for the case when the titanium atom enters into the zirconia (see Figure 8).…”

Section: Nmsupporting

confidence: 90%

Design and Photocatalytic Activity of Mesoporous TiO₂/ZrO₂ Thin Films

Gnatyuk¹,

Smirnova²,

Eremenko³

et al. 2005

Adsorption Science & Technology

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“…Therefore in the present work on preparation of titania/silica samples, the calcination temperature was 1073 K but the calcination time was relatively short (1 h). Titania synthesized at the fumed silica substrates is characterized by much lower crystallinity ( The rutile/anatase ratio and other morphological characteristics of titania deposits depend not only on the calcination temperature [27,28] but also on the kind of a silica matrix (A-50, A-100 and A-380) [50] This can be due to the reactions of 2-propanol with titanium species (e.g. TiOH groups), dissolved ions or protons, and surface hydroxyls (TiOH, SiOH, SiO(H)Ti, etc.)…”

Section: Resultsmentioning

confidence: 99%

“…Different precursors were used to synthesize titania, e.g., TiX 4 at X = Cl, OCH(CH 3 ) 2 and other OR [41][42][43][44][45][46][47] which could be transformed through oxidation, hydrolysis/dehydration, and thermal decomposition to form titania. Reactions at relatively low temperatures and subsequent calcination at T < 850 K give amorphous titania [48] or a mixture of anatase with the amorphous phase [25,28,33,35]. Elevating T r leads to the formation of a portion of rutile and its contribution increases with T r .…”

Section: Introductionmentioning

confidence: 99%

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Titania deposits on nanosilicas

Gun'ko¹,

Богатырев²,

Лебода³

et al. 2009

Annales UMCS, Chemistry

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Titania (content C TiO2 = 2.7-20.0 wt%) was synthesized on different fumed silica substrates (A-50, A-100, A-380) using Ti[OCH(CH 3 ) 2 ] 4 as a precursor interacting with silica/adsorbed water in 2-propanol or CCl 4 medium, dried and then heated at 1073 K for 1 h. Initial and pretreated nanosilicas and titania/silicas were studied using XRD, adsorption, FTIR, TEM, AFM, and TPD-MS methods. The morphology of grafted titania (anatase/rutile/amorphous phase composition, particle size distribution, aggregation, textural porosity) depends on the types of a nanosilica matrix and a solvent, suspension treatments and reaction conditions.

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“…They were designed as TS-40 x , TS-60 x , and TS-100 x , where x denotes the number of CVD cycles. The details of the preparation process were described in Gun'ko et al (2002).…”

Section: Experimental Materialsmentioning

confidence: 99%

Thermal and calorimetric investigations of titania–silica composites

Charmas

Skubiszewska–Zięba

Waniak-Nowicka

2017

Adsorption Science & Technology

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The paper presents the studies of effects of TiO 2 amount differentiation on the structural and thermal properties of titania-silica complex oxides prepared by chemical vapor deposition of TiCL 4 onto the Si-40, Si-60, and Si-100 silica gels. The mesoporous materials, characterized by a varied pore structure with highly developed surface and large pore volume, were obtained. The porous structure of materials under investigations was characterized by the low-temperature nitrogen adsorption-desorption method as well as by power spectral density calculated from the calorimetric investigations of water confined in the pores. Moreover, the thermodesorption of water using the quasi-isothermal thermogravimetry was used to characterize their thermal and surface properties. The adsorbed water layers and the concentration of weakly and strongly bound water as well as the surface free energy on the adsorbent-water interfaces were calculated. It was stated that the increase of titania content causes a gradual decrease of specific surface area and has a significant effect on the porous structure formation. The water thermodesorption from the surface proceeds in few stages because of the porosity created by TiO 2 . The decrease in the total surface free energy (ÁG AE ) can be observed with the increasing TiO 2 content. The largest ÁG AE value at the adsorbent/strongly bound water interface is exhibited by the adsorbents of Si-100 series. The lowering of the freezing/melting points of water contained in the pores of the studied materials is strongly connected with their porous structure.

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CVD-Titania on Fumed Silica Substrate

Cited by 79 publications

References 38 publications

Design and Photocatalytic Activity of Mesoporous TiO₂/ZrO₂ Thin Films

Design and Photocatalytic Activity of Mesoporous TiO₂/ZrO₂ Thin Films

Titania deposits on nanosilicas

Thermal and calorimetric investigations of titania–silica composites

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CVD-Titania on Fumed Silica Substrate

Cited by 79 publications

References 38 publications

Design and Photocatalytic Activity of Mesoporous TiO2/ZrO2 Thin Films

Design and Photocatalytic Activity of Mesoporous TiO2/ZrO2 Thin Films

Titania deposits on nanosilicas

Thermal and calorimetric investigations of titania–silica composites

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Product

Resources

About

Design and Photocatalytic Activity of Mesoporous TiO₂/ZrO₂ Thin Films

Design and Photocatalytic Activity of Mesoporous TiO₂/ZrO₂ Thin Films