Effect of microwave assisted and conventional thermal heating on the evolution of nanostructured inorganic–organic hybrid materials to binary ZrO2–SiO2 oxides

Mascotto, Simone; Tsetsgee, Otgontuul; Müller, Klaus; Maccato, Chiara; Smarsly, Bernd M.; Brandhuber, Doris; Tondello, Eugenio; Gross, Silvia

doi:10.1039/b707723h

Cited by 15 publications

(42 citation statements)

References 50 publications

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“…[37,38] Furthermore, the experimental Si/Zr molar ratio is 10, in agreement with the nominal composition of the solution used for the synthesis of the matrix. The BE in the 532.2-532.6 eV region is typical of O 1s in a silica environment.…”

supporting

confidence: 53%

“…[36][37][38] The weak shoulder at 960 cm À1 , attributed to the Si-OH stretching, is of lower intensity after the grafting reaction with both N,N-dialkylcarbamato complexes, as expected, due to the reaction with the silanol groups of the silica. The same features were observed also in all the IR data of the other functionalized samples (data not shown), thus proving the efficiency of the adopted method.…”

mentioning

confidence: 83%

“…[36][37][38] Microstructure analysis: To evaluate the effect of the surface and morphology of the matrices on the grafting efficiency, the specific surface area of the samples was determined before the grafting experiments by dinitrogen adsorption analysis: samples ZS110 MF1000 and sSi show type IIa isotherms ( Figure 1) [49] typical of nonporous or macroporous Scheme 1. The grafting procedure.…”

Section: Resultsmentioning

confidence: 99%

“…[36,38] The extent of the functionalization, as described below, was evaluated as a function of various experimental parameters, namely: a) the type of matrix (commercially available or synthesized); b) the type of N,N-dialkylcarbamato complex; c) the duration of the matrix-precursor interaction (1, 3, 5, 10, or 15 days); d) the type of thermal treatment (conventional or microwave).…”

Section: O 2 a C H T U N G T R E N N U N G (Omc)mentioning

confidence: 99%

“…After the grafting experiments and the thermal annealing at 600 8C, the XRD pattern of sample ZS110 MF1000 Cu1-3 ( Figure 5) contains the typical reflections of tetragonal zirconia, [38] as well as further reflections peaking at 35.58 and at 38.88 which overlap with them. Less intense features are present at 2q = 48.88, 53.38,58.28, 61.68, 66.18, and 67.08.…”

mentioning

confidence: 99%

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supporting

confidence: 53%

mentioning

confidence: 83%

Section: Resultsmentioning

confidence: 99%

Section: O 2 a C H T U N G T R E N N U N G (Omc)mentioning

confidence: 99%

mentioning

confidence: 99%

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Analytical Understanding of the Materials Design with Well‐Described Shrinkages on Multiscale

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et al. 2018

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Shrinkages derived from condensation of frameworks are one of the significant steps for fabricating demanded materials having unique morphologies and properties. Enormous efforts have been dedicated to understanding their mechanisms that are quite useful for the materials design. In this context, diversified measuring and observing tools have been facilitated to evaluate structural contractions and corresponding driving forces. All of the investigations are crucial to encourage the utilization of such shrinkages for the precise design of nanomaterials. In this review, we summarize significant works how to analyze shrinkages in multiscale during the synthesis of materials, which will be useful as a follow-up review to our latest contribution. Well-defined porous materials are also selected as a good candidate for understanding well-described shrinkages. This review aims to provide a detailed glimpse of the development of analyses on shrinking behaviors in multiscale for the materials design. Shrinking degree and direction in multiscale, which are driven by condensation of frameworks, are predominant for understanding and/or predicting final nanostructures of materials after shrinkages.

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Enhancement of the SrTiO₃ Surface Reactivity by Exposure to Electric Fields

et al. 2019

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In the present work the effect of electric field assisted treatments, i. e. flash sintering, on the physicochemical properties and surface reactivity of SrTiO3 nanoparticles is investigated. The materials were prepared by a hydrothermal approach and consolidated at high temperatures by conventional and electric field assisted procedures. The exposure to an electric field from 300 to 900 V/cm allowed rapid consolidation with progressive reduction of the grain growth and the shrinkage of the specific surface area to 22% and 43%, respectively. XPS analyses evidenced increasing Sr segregation at the surface if voltage was applied during the treatment. The corresponding presence of Sr vacancies in the perovskite lattice was demonstrated by ESR spectroscopy. Both techniques pointed out the appearance of highly oxidative O− species in all ceramics. The materials reactivity was investigated by methane oxidation, chosen as model high temperature catalytic reaction. With respect to conventionally treated SrTiO3, the surface area normalized reaction rate significantly improved for the ceramics exposed to electric field, until a maximum of three times for the material treated at 900 V/cm. Such enhanced properties were ascribed to the larger extent of Sr enrichment and in particular to the correlated field‐induced defect structure perturbation.

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Effect of microwave assisted and conventional thermal heating on the evolution of nanostructured inorganic–organic hybrid materials to binary ZrO2–SiO2 oxides

Cited by 15 publications

References 50 publications

Nanostructured Copper Oxide on Silica–Zirconia Mixed Oxides by Chemical Implantation

Nanostructured Copper Oxide on Silica–Zirconia Mixed Oxides by Chemical Implantation

Analytical Understanding of the Materials Design with Well‐Described Shrinkages on Multiscale

Enhancement of the SrTiO₃ Surface Reactivity by Exposure to Electric Fields

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Effect of microwave assisted and conventional thermal heating on the evolution of nanostructured inorganic–organic hybrid materials to binary ZrO2–SiO2 oxides

Cited by 15 publications

References 50 publications

Nanostructured Copper Oxide on Silica–Zirconia Mixed Oxides by Chemical Implantation

Nanostructured Copper Oxide on Silica–Zirconia Mixed Oxides by Chemical Implantation

Analytical Understanding of the Materials Design with Well‐Described Shrinkages on Multiscale

Enhancement of the SrTiO3 Surface Reactivity by Exposure to Electric Fields

Contact Info

Product

Resources

About

Enhancement of the SrTiO₃ Surface Reactivity by Exposure to Electric Fields