Effect of Rare Earth Oxides on Properties of Nano Antibacterial Ceramic Glaze

2020 ◽  
Vol 852 ◽  
pp. 139-149
Author(s):  
Guang Fu Liu
Keyword(s):  
Rare Earth ◽  
Thermal Shock Resistance ◽  
Antibacterial Agents ◽  
Antibacterial Effect ◽  
Rare Earth Oxide ◽  
Rare Earth Oxides ◽  
Antibacterial Materials ◽  
Ceramic Glaze ◽  
Good Antibacterial Activity ◽  
Shock Resistance

This topic is based on the research and development of inorganic silver-loaded antibacterial materials with good antibacterial activity, and the preparation of silver-loaded calcium carbonate inorganic nano-antibacterial agents by redox reaction. At the same time, the mixed rare earth oxide was added to the ceramic glaze containing silver nano antibacterial agent, and the nano antibacterial building sanitary ceramics were prepared by firing at 1180 °C in an oxidizing atmosphere. This experiment investigated the effect of adding mixed rare earth oxides on the quality and properties of glaze. Experiments show that the new glaze has stronger antibacterial effect than the nano antibacterial glaze without mixed rare earth oxide, and the glaze quality is good. After adding 0.5 wt% of mixed rare earth oxide, the whiteness, abrasion resistance, hardness and thermal shock resistance of the glaze were significantly improved.This topic is based on the research and development of inorganic silver-loaded antibacterial materials with good antibacterial activity, and the preparation of silver-loaded calcium carbonate inorganic nano-antibacterial agents by redox reaction. At the same time, the mixed rare earth oxide was added to the ceramic glaze containing silver nano antibacterial agent, and the nano antibacterial building sanitary ceramics were prepared by firing at 1180 °C in an oxidizing atmosphere. This experiment investigated the effect of adding mixed rare earth oxides on the quality and properties of glaze. Experiments show that the new glaze has stronger antibacterial effect than the nano antibacterial glaze without mixed rare earth oxide, and the glaze quality is good. After adding 0.5 wt% of mixed rare earth oxide, the whiteness, abrasion resistance, hardness and thermal shock resistance of the glaze were significantly improved.

Thermal shock resistance of Si3N4 and Si3N4–SiC ceramics with rare-earth oxide sintering additives

2014 ◽  
Vol 34 (14) ◽  
pp. 3301-3308 ◽  
Author(s):  
Monika Kašiarová ◽  
Peter Tatarko ◽  
Peter Burik ◽  
Ján Dusza ◽  
Pavol Šajgalík
Keyword(s):  
Rare Earth ◽  
Thermal Shock ◽  
Thermal Shock Resistance ◽  
Rare Earth Oxide ◽  
Sintering Additives ◽  
Sic Ceramics ◽  
Shock Resistance

Nano Crystallite ZrO2, La2O3 and CeO2: Synthesis, Characterization and their Properties

2013 ◽  
Vol 209 ◽  
pp. 212-215
Author(s):  
A.K. Patel ◽  
A.R. Umatt ◽  
B.S. Chakrabarty
Keyword(s):  
Rare Earth ◽  
Surface Area ◽  
Gas Adsorption ◽  
Chemical Properties ◽  
Rare Earth Oxide ◽  
Combustion Method ◽  
Rare Earth Oxides ◽  
Precipitation Method ◽  
Reaction Conditions ◽  
The Rare Earth

It is well known that a minor addition of rare earth oxides can provide a beneficial effect towards various catalytic reactions. Use of rare earth oxide in different applications could improve commercial productivity in an affordable way. Among the rare earth oxides, ZrO2, La2O3 and CeO2 are very interesting due to their various characteristics showing a large range of applications in organic reactions. The changes in the molecular properties of materials at the nano scale level greatly enhance their physical properties as well as chemical properties and activity. Due to the extremely small size of the particles, an increased surface area is provided to the reactant enabling more molecules to react at the same time, thereby speeding up the process. In this work, the enhancement in the catalytic activity of these nano structured rare earth oxides has been studied under different reaction conditions. Nano crystalline ZrO2, La2O3 and CeO2 samples were synthesized using precipitation method and optimum reaction conditions have been established; whereas the corresponding bulk samples were synthesized by combustion method. The identification of phase and crystalline size of synthesized oxides have been done by X-ray diffraction, the band gape of these three oxides in both the forms has been analyzed by UV absorbance and surface area has been determined by gas adsorption analysis (BET). Moreover their different properties and the activity of nano crystallite oxides have also been compared with their bulk counterparts. Even the activity of ZrO2 is also compared with the rare earth oxides La2O3 and CeO2.

Effects of Rare Earth Oxides on Microstructures and Properties of Magnesia Refractories

2008 ◽  
Vol 368-372 ◽  
pp. 1158-1160 ◽  
Author(s):  
Bao Guo Zhang ◽  
Zhou Fu Wang ◽  
Shao Wei Zhang ◽  
Xi Tang Wang ◽  
Zi Wei Xu
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
Rare Earth ◽  
High Temperature ◽  
Mechanical Strength ◽  
Grain Boundaries ◽  
Bulk Density ◽  
Rare Earth Oxide ◽  
Rare Earth Oxides ◽  
Microstructure And Mechanical Properties

The effects of Y2O3, La2O3 and Nd2O3 on the sintering, microstructure and mechanical properties of magnesia refractories were investigated. Addition of rare earth oxide (ReO) to magnesia refractories increases the bulk density, decreases the porosity and improves the mechanical strength of the refractories. The improved sinterability was attributable to the vacancies generation associated with the solid-solution reactions between MgO and ReO. In the samples with ReO, rare earth silicate phases form at magnesia grain boundaries, providing additional bonding between magnesia grains and between magnesia grains and matrix. Consequently, the samples with ReO showed much higher high temperature strengths than those without ReO.

Fracture Toughness of Si3N4 Based Ceramics with Rare-Earth Oxide Sintering Additives

2009 ◽  
Vol 409 ◽  
pp. 377-381 ◽  
Author(s):  
Peter Tatarko ◽  
Štefánia Lojanová ◽  
Ján Dusza ◽  
Pavol Šajgalík
Keyword(s):  
Fracture Toughness ◽  
Rare Earth ◽  
Silicon Nitride ◽  
Aspect Ratio ◽  
Rare Earth Oxide ◽  
Rare Earth Oxides ◽  
Crack Deflection ◽  
Indentation Fracture ◽  
Toughening Mechanisms ◽  
Sintering Additives

Fracture toughness of hot-pressed silicon nitride and Si3N4+SiC nanocomposites prepared with different rare-earth oxides (La2O3, Sm2O3, Y2O3, Yb2O3, Lu2O3) sintering additives have been investigated by Chevron Notched Beam, Indentation Strength and Indentation Fracture techniques. The fracture toughness values of composites were lower due to the finer microstructures and the lack of toughening mechanisms. In the Si3N4 with higher aspect ratio (Lu or Yb additives) crack deflection occurred more frequently compared to the Si3N4 doped with La or Y, which was responsible for the higher fracture toughness.

scholarly journals Rare-Earth Oxides as Alternative High-Energy Photon Protective Fillers in HDPE Composites: Theoretical Aspects

Polymers ◽  
2021 ◽  
Vol 13 (12) ◽  
pp. 1930
Author(s):  
Kiadtisak Saenboonruang ◽  
Worawat Poltabtim ◽  
Arkarapol Thumwong ◽  
Theerasarn Pianpanit ◽  
Chanis Rattanapongs
Keyword(s):  
Rare Earth ◽  
Attenuation Coefficient ◽  
Rare Earth Oxide ◽  
High Energy ◽  
Rare Earth Oxides ◽  
Lead Free ◽  
High Energy Photon ◽  
Energy Photon ◽  
X Ray ◽  
Shielding Properties

This work theoretically determined the high-energy photon shielding properties of high-density polyethylene (HDPE) composites containing rare-earth oxides, namely samarium oxide (Sm2O3), europium oxide (Eu2O3), and gadolinium oxide (Gd2O3), for potential use as lead-free X-ray-shielding and gamma-shielding materials using the XCOM software package. The considered properties were the mass attenuation coefficient (µm), linear attenuation coefficient (µ), half value layer (HVL), and lead equivalence (Pbeq) that were investigated at varying photon energies (0.001–5 MeV) and filler contents (0–60 wt.%). The results were in good agreement (less than 2% differences) with other available programs (Phy-X/PSD) and Monte Carlo particle transport simulation code, namely PHITS, which showed that the overall high-energy photon shielding abilities of the composites considerably increased with increasing rare-earth oxide contents but reduced with increasing photon energies. In particular, the Gd2O3/HDPE composites had the highest µm values at photon energies of 0.1, 0.5, and 5 MeV, due to having the highest atomic number (Z). Furthermore, the Pbeq determination of the composites within the X-ray energy ranges indicated that the 10 mm thick samples with filler contents of 40 wt.% and 50 wt.% had Pbeq values greater than the minimum requirements for shielding materials used in general diagnostic X-ray rooms and computerized tomography rooms, which required Pbeq values of at least 1.0 and 1.5 mmPb, respectively. In addition, the comparisons of µm, µ, and HVL among the rare-earth oxide/HDPE composites investigated in this work and other lead-free X-ray shielding composites revealed that the materials developed in this work exhibited comparable X-ray shielding properties in comparison with that of the latter, implying great potential to be used as effective X-ray shielding materials in actual applications.

Crystallographic orientation–surface energy–wetting property relationships of rare earth oxides

2018 ◽  
Vol 6 (38) ◽  
pp. 18384-18388 ◽  
Author(s):  
Jason Tam ◽  
Bin Feng ◽  
Yuichi Ikuhara ◽  
Hiromichi Ohta ◽  
Uwe Erb
Keyword(s):  
Rare Earth ◽  
Surface Energy ◽  
Crystallographic Orientation ◽  
Rare Earth Oxide ◽  
Rare Earth Oxides ◽  
Oxide Ceramics ◽  
Wetting Property ◽  
Energy Relationships

Understanding the wettability of rare earth oxide ceramics from crystallographic orientation–surface energy relationships.

Orientation Control of Perovskite Epitaxial Thin Film on Silicon Substrate with Yttria-Stabilized Zirconia Buffer Layers

2006 ◽  
Vol 320 ◽  
pp. 69-72 ◽  
Author(s):  
Masao Kondo ◽  
Kazuaki Kurihara
Keyword(s):  
Thin Film ◽  
Rare Earth ◽  
Buffer Layer ◽  
Layer Structure ◽  
Rare Earth Oxide ◽  
Calcium Titanate ◽  
Rare Earth Oxides ◽  
Yttria Stabilized Zirconia ◽  
Buffer Layers ◽  
Stabilized Zirconia

The influence of a rare earth oxide/yttria-stabilized zirconia (YSZ) double buffer layer structure on the orientation of a perovskite thin film was investigated on (100) silicon substrates. A calcium titanate perovskite film with a mixture of (110) and (100) orientation was grown epitaxially on a YSZ buffer layer. Since rare earth oxides have almost the same chemical nature and different lattice parameters, it is anticipated that the lattice parameter of the buffer layer can be controlled by changing the rare earth element. An (100) oriented epitaxial calcium titanate film was obtained by changing the composition of rare earth oxides on the YSZ/Si substrate.

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