Yttria stabilized zirconia microtubes for microfluidics under extreme conditions

Sulfated solid acid catalyst finds application mainly in the reactions which requires acid sites. Synthesis of azo dyes by diazo coupling in presence of sulfated core shell zirconiacopper oxide solid acid catalyst (Cu(I)@ZrO 2 -SO 4 2À ) has been discussed hereunder. A detailed investigation on, the effect of sulfate loading, surface area and surface acidity for the synthesis of azo dyes has been demonstrated. As sulfate loading increased on the catalyst, it decreased its surface area and this was evident from the Brunauer Emmett Teller surface area analysis. The robust catalytic activity of Cu(I)@ZrO 2 -SO 4 2À catalyst was due to its super acidity, which arises due to the presence of both Bronsted and Lewis acid sites, this was experimentally confirmed by Pyridine-Fourier transform infrared spectroscopy and ammonia-temperature programmed desorption studies. X-ray diffraction, transmission electron microscopy and selected area electron diffraction techniques provided detailed information about the effect of sulfate loading on phase and crystal structure of the catalyst. In the present work we describe a simple, efficient and environmentally benign catalytic process for the synthesis of azo dyes.[a] L. Parashuram, Dr.

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“…The presence of (101) plane was also visualized in HRTEM image Figure c. The data obtained is consistent with the literature reported …”

Section: Resultssupporting

confidence: 90%

Environmentally Benign Approach for the Synthesis of Azo Dyes in the Presence of Mesoporous Sulfated Core‐Shell Zirconia‐Copper(I) Oxide Solid Acid Catalyst

et al. 2019

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“…The 8% YSZ microtubes used in the current study were prepared as thoroughly described and characterized in previous publications [30,37,38]. The YSZ microtube was melt-jointed onto a top of a large quartz Pasteur pipette capillary (inner diameter ID = 5.5 mm) which narrowed down to about 100 µm on the one end, similarly as described in [30]. Narrowing as well as melt-jointing was achieved in the flame of heat gun Kemper 12,500 Micro.…”

Section: Experimental Set-upmentioning

confidence: 99%

“…To our knowledge, no such experimental works exist. However, we recently demonstrated the possibility to ignite a discharge in a single Y-ZrO 2 nanoceramic microtube in He flow at atmospheric pressure [30].…”

Section: Introductionmentioning

confidence: 99%

“…High-temperature ionic conductance of YSZ enables the use as electrolyte in solid oxide fuel cells [36]. In our previous works, a method was proposed for the preparation of high-quality YSZ microtubes with a diameter below 100 µm and wall thickness less than 20 µm [30,37,38]. The tubes were composed of structurally homogeneous 100% cubic phase 8% yttria-stabilized zirconia.…”

Section: Introductionmentioning

confidence: 99%

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Application of Y–ZrO2 microtubes as dielectric barrier material in a He atmospheric pressure micro-plasma jet

et al. 2021

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This work focused on the application of novel 8% yttria-stabilized Zr2O3 (YSZ) microtubes with an inner diameter of 60 µm as dielectric material in an atmospheric pressure micro-plasma jet (APPJ). Furthermore, a comparison with quartz microtubes allowed to study the effect of tube material on plasma properties. Optical emission spectroscopy was employed to determine various spectral line ratios including ratios of He lines 667 nm (31D-21P) to 728 nm (31S-21P) which is indicative of electric field strength. The 667/728 nm line ratio in the YSZ microtube was about 2/3 the value in the 60-µm quartz tube. However, increasing the quartz tube’s inner diameter from 60 to 500 µm decreased the 667/728 nm line ratio 40 times. Additionally, the spatio-temporal evolution of the ionization wave was measured in the YSZ microtube and the velocity of the ionization wave was determined to accelerate from 67 km/s near the powered electrode to 161 km/s near the tube orifice.

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“…For example, gelation of titanium butoxide sols occurs much more homogeneously with the formation of Van der Waals bonds in the beginning of process as compared to zirconium butoxide sols, which immediately lose a majority of alkoxy groups in a contact with water, therefore releasing a significant amount of alkoxy groups and forming strong covalent bonds between the metal-oxo-alkoxy sol particles. It also was demonstrated that, due to the large quantity of released alcohol, sol particles are free to rearrange and self-form into high quality ZrO 2 gel microtubes with optical wave guiding properties [ 20 ].…”

Section: Introductionmentioning

confidence: 99%

Rheological Properties of MWCNT-Doped Titanium-Oxo-Alkoxide Gel Materials for Fiber Drawing

et al. 2022

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A strategy of doping by multi-walled carbon nanotubes (MWCNT) to enhance mechanical strength and the electrical conductivity of ceramic fibers has nowadays attracted a great deal of attention for a wide variety of industrial applications. This study focuses on the effect of MWCNTs on rheological properties of metal alkoxide precursors used for the preparation of nanoceramic metal oxide fibers. The rheological behavior of MWCNT-loaded titanium alkoxide sol precursors has been evaluated via an extensional rheometry method. A substantial decrease in elongational viscosity and relaxation time has been observed upon an introduction of MWCNTs even of low concentrations (less than 0.1 wt.%). A high quality MWCNT/nanoceramic TiO2 composite fibers drawn from the specified precursors has been validated. The MWCNT percolation, which is mandatory for electrical conductivity (50 S/m), has been achieved at 1 wt.% MWCNT doping.

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Yttria stabilized zirconia microtubes for microfluidics under extreme conditions

Cited by 11 publications

References 45 publications

Environmentally Benign Approach for the Synthesis of Azo Dyes in the Presence of Mesoporous Sulfated Core‐Shell Zirconia‐Copper(I) Oxide Solid Acid Catalyst

Environmentally Benign Approach for the Synthesis of Azo Dyes in the Presence of Mesoporous Sulfated Core‐Shell Zirconia‐Copper(I) Oxide Solid Acid Catalyst

Application of Y–ZrO2 microtubes as dielectric barrier material in a He atmospheric pressure micro-plasma jet

Rheological Properties of MWCNT-Doped Titanium-Oxo-Alkoxide Gel Materials for Fiber Drawing

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