Synthesis and Characterization of Yttria-Stabilized Zirconia (YSZ) Nano-Clusters for Thermal Barrier Coatings (TBCs) Applications

Tailor, Satish; Singh, Manoj; Doub, A. V.

doi:10.1007/s10876-016-1014-y

Cited by 29 publications

(12 citation statements)

References 37 publications

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“…Apparently, no monoclinic phase was detected in none of the specimens because of the absence of the distinctive sharp band for this phase at 740cm −1 . Low-intensity peaks at 1400 and 1650 cm −1 of nY-ZrO800 specimen might be attributed to the symmetric and asymmetric stretching vibrations of the carboxylate groups of organic components of decomposed gel [34].…”

Section: Ftir Analysismentioning

confidence: 99%

“…ZrO 2 7 wt% Y 2 O 3 nanoparticles were synthesized by the sol-gel method using zirconium oxychloride octahydrate (ZrOCl 2 8H 2 O) and yttrium nitrate hexahydrate (Y(NO 3 ) 3 6H 2 O) as starting materials [33,34]. Raw materials were dissolved in double distilled water, mixed and then an aqueous solution of ethylene glycol and an aqueous citric acid concentrate was added under heating and stirring.…”

Section: Synthesis Of Nanoparticlesmentioning

confidence: 99%

“…From the dTG curve, it can be concluded that the overall weight loss (85.3%) occurred in five main stages. The first step took place at temperatures between 26 and 150 • C, accompanied by an endothermic peak at ~100 • C, and is attributed to the evaporation of the absorbed water (3.5% mass loss) [33,34,41,42]. In the temperature range of 150-240 • C, the second step of the degradation presented an endothermic peak at ~210 • C that can be ascribed to the release of nitrates and/or the citrate matrix's decomposition (45% mass loss) [43,44].…”

Section: Tg-dsc Analysismentioning

confidence: 99%

“…The third stage of the gel's degradation occurred around 240-300 • C with an endothermic peak appearing at ~286 • C, possibly due to the decomposition of zirconyl oxalate (ZrOC 2 O 4 ) and Y 2 (C 2 O 4 ) 3 (20.9% mass loss) [43,45]. An exothermic peak at ~355 • C took place on the fourth step of the process, which took place at temperatures between 300 and 540 • C. This peak could be attributed to the degradation of organic and organometallic compounds, CO 2 removal and the destruction of the polymeric network [34] or to the oxidation of the residual organic compounds [44] (mass loss 15.9%). During the final step of the degradation that occurred in the temperature range of 540-900 • C, an exothermic peak appeared at ~628 • C, possibly related to the removal of the element carbon from the final compound [44] and/or a crystalline-amorphous phase transition [33,45].…”

Section: Tg-dsc Analysismentioning

confidence: 99%

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Sol–Gel Synthesis and Characterization of YSZ Nanofillers for Dental Cements at Different Temperatures

et al. 2021

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Background: Yttria-stabilized zirconia nanoparticles can be applied as fillers to improve the mechanical and antibacterial properties of luting cement. The aim of this study was to synthesize yttria-stabilized zirconia nanoparticles by the sol–gel method and to investigate their composition, structure, morphology and biological properties. Methods: Nanopowders of ZrO2 7 wt% Y2O3 (nY-ZrO) were synthesized by the sol–gel method and were sintered at three different temperatures: 800, 1000 and 1200 °C, and their composition, size and morphology were investigated. The biocompatibility was investigated with human gingival fibroblasts (hGFs), while reactive oxygen species (ROS) production was evaluated through fluorescence analysis. Results: All synthesized materials were composed of tetragonal zirconia, while nanopowders sintered at 800 °C and 1000 °C additionally contained 5 and 20 wt% of the cubic phase. By increasing the calcination temperature, the crystalline size of the nanoparticles increased from 12.1 nm for nY-ZrO800 to 47.2 nm for nY-ZrO1200. Nano-sized particles with good dispersion and low agglomeration were received. Cell culture studies with human gingival fibroblasts verified the nanopowders’ biocompatibility and their ROS scavenging activity. Conclusions: the obtained sol–gel derived nanopowders showed suitable properties to be potentially used as nanofillers for dental luting cement.

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Section: Ftir Analysismentioning

confidence: 99%

Section: Synthesis Of Nanoparticlesmentioning

confidence: 99%

Section: Tg-dsc Analysismentioning

confidence: 99%

Section: Tg-dsc Analysismentioning

confidence: 99%

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Sol–Gel Synthesis and Characterization of YSZ Nanofillers for Dental Cements at Different Temperatures

et al. 2021

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“…Zirconia-based ceramics is a commonly used material [1][2][3][4]. The starting product for its production is zirconia powders [5] doped with stabilizing additive, for example, yttrium oxide, to improve its strength properties [6,7].…”

Section: Introductionmentioning

confidence: 99%

Investigation with using thermal analysis of gas evolution and sintering of nanopowders of zirconia prepared by sol-gel method

Sheveleva¹,

Shevelev²,

Sokolovskiy³

et al. 2020

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Thermal and XRD analyses were used to study partially stabilized zirconia powders produced by sol-gel method in order to investigate gas evolution in annealing in air and densification behavior of these powders in compaction and subsequent sintering. It was found that the powders of the initial gel contain a large amount of gas adsorbates. The amount of adsorbates decreases as the annealing temperature grows. At annealing temperature of 700 ºC, adsorbates are completely removed from the powders and the latter obtain a crystalline structure with a predominant tetragonal phase. Gas adsorbates affect densification of powder compacts during sintering and facilitate the production of ceramics with a porosity of not more than 5 %. It is shown that the production of low porosity ceramics is complicated even though powders subjected to annealing may contain nano-sized impurities or be free of these. Low-melting additives are proposed to be used for ceramics production.

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Surface Acidic Species‐Driven Reductive Amination of Furfural with Ru/T‐ZrO₂

Saini,

Arulananda Babu,

Saravanamurugan

2024

ChemSusChem

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Catalyst development for upgrading bio‐based chemicals towards primary amines has increasingly attracted owing to their applications in the pharmaceutical and polymer industries. The surface acidic sites in metal oxide‐based catalysts play a key role in the reductive amination of aldehydes/ketones involving H2 and NH3; however, the crucial role of the type of surface acidic species and their strength remains unclear. Herein, this study exhibits the catalytic reductive amination of furfural (FUR) to furfurylamine (FUA) with Ru supported on tetragonal (Ru/T‐ZrO2) and monoclinic (Ru/M‐ZrO2) ZrO2. Ru/T‐ZrO2 exhibited an 11.8‐fold higher rate of reductive amination than Ru/M‐ZrO2, giving a quantitative yield of FUA (99%) at 80 °C in 2.5 h and is recyclable up to four runs. Catalyst surface investigation using spectroscopic techniques, like X‐ray photoelectron, electron paramagnetic resonance, and Raman, confirm higher oxygen vacancy sites (1.6 times) on the surface of Ru/T‐ZrO2 compared to Ru/M‐ZrO2. Moreover, in‐situ NH3‐diffuse reflectance infrared Fourier transform spectroscopy studies display that Ru/T‐ZrO2 has more moderate Bronsted acidic sites (surface H‐bonded hydroxyl groups) than Ru/M‐ZrO2. Further, the controlled experiments and poisoning studies with KSCN and 2,6‐lutidine suggest the crucial role of Ov sites (Lewis acidic sites) and surface hydroxyl groups (Bronsted acidic sites) for selective FUA formation.

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Synthesis and Characterization of Yttria-Stabilized Zirconia (YSZ) Nano-Clusters for Thermal Barrier Coatings (TBCs) Applications

Cited by 29 publications

References 37 publications

Sol–Gel Synthesis and Characterization of YSZ Nanofillers for Dental Cements at Different Temperatures

Sol–Gel Synthesis and Characterization of YSZ Nanofillers for Dental Cements at Different Temperatures

Investigation with using thermal analysis of gas evolution and sintering of nanopowders of zirconia prepared by sol-gel method

Surface Acidic Species‐Driven Reductive Amination of Furfural with Ru/T‐ZrO₂

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Synthesis and Characterization of Yttria-Stabilized Zirconia (YSZ) Nano-Clusters for Thermal Barrier Coatings (TBCs) Applications

Cited by 29 publications

References 37 publications

Sol–Gel Synthesis and Characterization of YSZ Nanofillers for Dental Cements at Different Temperatures

Sol–Gel Synthesis and Characterization of YSZ Nanofillers for Dental Cements at Different Temperatures

Investigation with using thermal analysis of gas evolution and sintering of nanopowders of zirconia prepared by sol-gel method

Surface Acidic Species‐Driven Reductive Amination of Furfural with Ru/T‐ZrO2

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Surface Acidic Species‐Driven Reductive Amination of Furfural with Ru/T‐ZrO₂