Tin– and Titanium–Oxygen Nanostructures on the Various Hydr(oxides) Surfaces

Bogdanova, N. F.; Shved, Yu. A.; Klebanov, A. V.; Zheldakov, Igor L.; Ермакова, Л. Э.; Sidorova, M. P.; Savina, I. A.

doi:10.1023/b:coll.0000037446.32004.67

Cited by 5 publications

(4 citation statements)

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“…Previous investigations of the electrosurface characteristics of one-component titanium-oxygen nanolayers on a boehmite surface [16] indicated that an increase in the number of MLD reactions from 1 to 5 caused the IEP shift from 7.1 (1TiO 2 /AlOOH) to 5.8 (5TiO 2 /AlOOH) that almost coincide with the position of IEP for bulk titanium oxide (pH IEP = 5.9). Note that (see Fig.…”

Section: Bogdanova Et Almentioning

confidence: 80%

“…Earlier [13,14,16], we established that 4-5 cycles of MLD reactions are sufficient to obtain Al-oxygen nanostructures on an Aerosil surface and Ti-oxygen nanostructures on a boehmite surface, whose electrosurface properties are similar to those of corresponding bulk oxides. The study of Ti-oxygen nanostructures of different thicknesses ( n = 1-16), which were synthesized on silica substrates under different conditions with the involvement of both silanol and methoxy functional groups, demonstrated that the isoelectric point (IEP) of a nanolayer is intermediate between the pH IEP values of silicon and titanium oxides.…”

Section: Synthesis and Electrosurface Properties Of One-and Two-compomentioning

confidence: 91%

“…The method of molecular layer-by-layer deposition (MLD) from the gas phase allow one to produce one-and multicomponent element-oxygen nanostructures of different thicknesses on solid substrates [1][2][3][4][5][6][7][8][9]. Previously, we studied the electrosurface characteristics of one-component nanostructures synthesized on oxide substrates with the involvement of hydroxy and methoxy functional groups [10][11][12][13][14][15][16]. Data on electrosurface properties of composite (multicomponent) nanostructures are unavailable in the literature.…”

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Synthesis and Electrosurface Properties of One- and Two-Component Nanostructures

et al. 2005

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The interest in the study of the formation mechanisms and the structure of electrical double layers (EDL) at oxide-electrolyte solution interfaces is predetermined by both the abundance of oxides in the nature and their use in practice. Recently, thin oxide layers (oxide nanostructures) have been increasingly applied for the production of highly active catalysts, ion-selective field-effect transistors, and other microelectronic devices. The method of molecular layer-by-layer deposition (MLD) from the gas phase allow one to produce one-and multicomponent element-oxygen nanostructures of different thicknesses on solid substrates [1-9]. Previously, we studied the electrosurface characteristics of one-component nanostructures synthesized on oxide substrates with the involvement of hydroxy and methoxy functional groups [10][11][12][13][14][15][16]. Data on electrosurface properties of composite (multicomponent) nanostructures are unavailable in the literature. Therefore, the goal of this work was the synthesis, study, and comparison of electrosurface properties of one-and two-component Al-and Ti-based nanostructures formed as films of different thicknesses on oxide substrates. In addition, colloidal characteristics of element-oxygen nanostructures of different compositions were compared with those of the substrates and corresponding bulk (hydr)oxides.One-and two-component nanostructures were synthesized with the involvement of hydroxy functional groups according to the following reactions (with the reference to a silica substrate):where E = Al or Ti.Samples were prepared in a flow of air, which was preliminarily dried over phosphorous oxide to a residual moisture content of 2 mg/m 3 . The dried air was saturated with either titanium chloride vapor or the vapor of solid aluminum chloride heated to 200°ë . After the excess of hydrogen chloride was removed with the dried air, the reaction product was treated with water vapor at 200°ë until HCl escaped from the reactor. In order to maintain a specified temperature in the reaction zone, a Nichrome wire was used, to which a necessary voltage was applied. The temperature was measured with a thermocouple.Aluminum-and titanium-oxygen nanostructures of different thicknesses, which were set by number n of the cycles of surface reactions (1) and (2), were synthesized on silicon oxide and aluminum hydroxide substrates. Hereafter, these structures are conventionally designated as n Al 2 O 3 / SiO 2 , n TiO 2 / AlOOH, and n TiO 2 /5 Al 2 O 3 / SiO 2 .Aerosil OX-50 (Degussa) (with a specific surface area S 0 = 42.5 m 2 /g, as determined by the BET method using the thermal desorption of argon with chromatographic recording) and a plane-parallel quartz capillary were used as silicon oxide substrates. The plane-parallel capillary was formed by the plates of KU quartz glass whose inner surfaces were preliminarily ground and polished (14th class). The size of asperities on SiO 2 plates did not exceed 0.1 µ m. Capillary length (5.8 cm) was determined by the geometric sizes of an initial pl...

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Section: Bogdanova Et Almentioning

confidence: 80%

Section: Synthesis and Electrosurface Properties Of One-and Two-compomentioning

confidence: 91%

mentioning

confidence: 99%

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Synthesis and Electrosurface Properties of One- and Two-Component Nanostructures

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“…Furthermore, as the stability of photoactive suspensions is closely related to the pH, other factors such as the concentration of ions in solution also can have an effect on the load distribution and therefore change the adsorption of organic matter on the surface of the particles (Bogdanova et al, 2004;Nelson, et al, 2000). Somehow, the formation of a double layer under this condition favours a better adsorption of anionic substances, which can ampliate the reaction performance due to an increased local concentration of organic matter on the sites of production of oxidant radicals (Du et al, 2013;Oliveira et al, 2012;Suttiponparnit et al, 2013).…”

Section: Zeta Potential-estimation Of the Isoelectric Pointmentioning

confidence: 99%

Quantum Efficiency of Hydroxyl Radical Formation in a Composite Containing Nanocrystalline TiO2 e Zinc Phthalocyanine, and the Nature of the Incident Radiation

Batista¹,

Souza²,

Maximiano³

et al. 2013

JMSR

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In this study, we investigate the generation of hydroxyl radicals mediated by a composite containing TiO 2 and 1.6% m/m of zinc phthalocyanine (TiO 2 /ZnPc) in aqueous suspensions containing methanol as oxidisable substrate. The composite features a specific surface 20% less than the value estimated for TiO 2 P25, probably due to the covering of the surface of the oxide by ZnPc and the pH of the isoelectric point of this composite equal of 5.5, about two units of pH lower than the value estimated for TiO 2 P25, are probably related to the difference in photocatalytic activity found for these materials. To assess the influence of different spectral bands of electromagnetic radiation on the production of hydroxyl radicals, we used different sources of radiation in experiments conducted to estimate the quantum efficiency of hydroxyl radical formation (HO•), via photocatalytic oxidation of methanol. The association between zinc phthalocyanine and TiO 2 has allowed the formation of a light absorber material with absorption spectral range extended to the visible region. Our results suggest that, despite the higher values of  HO• for TiO 2 P25, the combination of visible and ultraviolet radiation furnished by a high pressure mercury lamp without the protective bulb, or solar radiation, causes the composite to present good values for the same parameter.

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Isoelectric points and points of zero charge of metal (hydr)oxides: 50years after Parks' review

Kosmulski

2016

Advances in Colloid and Interface Science

410

208

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Tin– and Titanium–Oxygen Nanostructures on the Various Hydr(oxides) Surfaces

Cited by 5 publications

References 5 publications

Synthesis and Electrosurface Properties of One- and Two-Component Nanostructures

Synthesis and Electrosurface Properties of One- and Two-Component Nanostructures

Quantum Efficiency of Hydroxyl Radical Formation in a Composite Containing Nanocrystalline TiO2 e Zinc Phthalocyanine, and the Nature of the Incident Radiation

Isoelectric points and points of zero charge of metal (hydr)oxides: 50years after Parks' review

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