The surface chemical properties of undoped tetragonal ZrO2 and the gas-phase dependence of the tetragonal-to-monoclinic transformation are studied using a tetragonal ZrO2 polymorph synthesized via a sol-gel method from an alkoxide precursor. The obtained phase-pure tetragonal ZrO2 is defective and strongly hydroxylated with pronounced Lewis acidic and Brønsted basic surface sites. Combined in s...

Lignin is a natural biopolymer present in lignocellulosic biomass. During paper pulp production with the Kraft process, it solubilized and degraded lignin then burned to recover energy. In this paper, solvolysis of was studied water water/alcohol mixtures produce oligomers monomers interest, at mild temperatures (200–275 °C) under inert atmosphere. It found that presence alcohol type (methanol,...

In this work, a single-layer TiO2–ZrO2 thin film is deposited on the AISI 316L austenitic stainless steel by sol–gel process and dip coating method to improve its corrosion resistance properties. For sol preparation, titanium isopropoxide zirconium butoxide are used as precursors, yttrium acetate hydrate for ZrO2 stabilization, i-propanol solvent, nitric acid catalyst, acetylacetone chelating a...

log (gas /glass) Major species of elements in the gas and glass phases log (gas /glass) Major species of elements in the gas and glass phases Ag 3.14 Ag(g), AgCl(g); AgCl Mn -5.30 MnO(g), MnCl2(g); MnSiO3 Al -5.60 AlOF2(g); Al2O3, feldspars Mo -0.2 H2MoO4(g); CaMoO4, Na2MoO4 As 1.28 AsO(g); AlAsO4 Na -0.76 NaCl(g); NaAlSi3O8 B 2.99 HBO2(g), NaBO2(g); CaB2O4 Nb -5.33 NbO2(g); NbO2, Nb2O5 Ba -5.1...

Ultrathin (∼3 Å) zirconium oxide films were grown on a single-crystalline Pt3Zr(0001) substrate by oxidation in 1 × 10-7 mbar of O2 at 673 K, followed by annealing at temperatures up to 1023 K. The ZrO2 films are intended to serve as model supports for reforming catalysts and fuel cell anodes. The atomic and electronic structure and composition of the ZrO2 films were determined by synchrotron-b...

This clinical report describes a treatment for the replacement of a missing mandibular anterior tooth using a cantilever single-retainer resin-bonded fixed partial denture (RBFPD), fabricated from zirconium dioxide (ZrO2) ceramic. No clinical complications were observed at the 2-year 6-month follow-up examination after placement of the ZrO2 ceramic RBFPD, and satisfactory functional and estheti...

A facile sol–gel coating procedure has been successfully applied for the ZrO2 coating of eggshell membranes (ESM), resulting in hierarchically ordered thin films with a macroporous network structure comprising crystalline ZrO2 tubes. This hierarchical material, which was obtained through sol–gel mineralization of the ESM template and subsequent calcination at 600 uC, was characterized by XRD, S...

This paper reports the synthesis of CeO2/ZrO2 nanocomposite by wet chemical method using cationic surfactant (CTAB). The properties of the obtained nanocomposites were analysed by X-ray diffraction (XRD), Fourier transform infrared (FTIR), scanning electron microscoy (SEM), transmission electron microscopy (TEM), UV-Diffuse Reflectance Spectroscopy (UV-DRS) and photoluminescence (PL) spectrosco...

Abstract In this project, nano-ZrO2 particles were dispersed in aluminum powder by a Y-shape mixer. The particle size of ZrO2 powder was < 40 nm and the amount of ZrO2 reinforcement varies from 3 to 15%.The mixed powders were compacted .Subsequently the compacted discs were sintered both in the microwave oven and in the conventional muffle furnace .Using microwave –assisted sintering method led...

......................................................................................................................................... ii Acknowledgements ................................................................................................................... iv List of Tables ............................................................................................................