Open Ceramics最新文献

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Thermal conductivity of silica refractories and its temperature dependence during thermal cycling, compared to silicite and sandstone

IF 2.9 Q1 MATERIALS SCIENCE, CERAMICS

Open Ceramics

Pub Date : 2025-01-10 DOI: 10.1016/j.oceram.2025.100735

Lucie Kotrbová , Tereza Uhlířová , Willi Pabst , Jana Hubálková , Miroslav Kotouček

The thermophysical properties of silica refractories are important for their potential application as high-temperature thermal energy storage (HT-TES) media. In this paper, we report new measurements of thermal conductivity and thermal diffusivity by plane-source techniques and the laser-flash technique, respectively. The latter is also used to determine the temperature dependence of the thermal conductivity from room temperature to 800 °C during heating and cooling. It is shown that for a silica refractory with porosity 21 % the experimentally measured thermal conductivity (1.3–1.6 W/mK) is significantly lower than the analytical and numerical predictions for spherical, polyhedral and concave pores (3.1–4.7 W/mK), which indicates the influence of microcracks. The anomaly in the temperature dependence below ∼200 °C can be attributed to the phase transitions of cristobalite and tridymite, but above this temperature the thermal conductivity increases, whereas that of silicite and sandstone decreases. Thermal cycling leads to microcrack-induced damage.

{"title":"Thermal conductivity of silica refractories and its temperature dependence during thermal cycling, compared to silicite and sandstone","authors":"Lucie Kotrbová , Tereza Uhlířová , Willi Pabst , Jana Hubálková , Miroslav Kotouček","doi":"10.1016/j.oceram.2025.100735","DOIUrl":"10.1016/j.oceram.2025.100735","url":null,"abstract":"<div><div>The thermophysical properties of silica refractories are important for their potential application as high-temperature thermal energy storage (HT-TES) media. In this paper, we report new measurements of thermal conductivity and thermal diffusivity by plane-source techniques and the laser-flash technique, respectively. The latter is also used to determine the temperature dependence of the thermal conductivity from room temperature to 800 °C during heating and cooling. It is shown that for a silica refractory with porosity 21 % the experimentally measured thermal conductivity (1.3–1.6 W/mK) is significantly lower than the analytical and numerical predictions for spherical, polyhedral and concave pores (3.1–4.7 W/mK), which indicates the influence of microcracks. The anomaly in the temperature dependence below ∼200 °C can be attributed to the phase transitions of cristobalite and tridymite, but above this temperature the thermal conductivity increases, whereas that of silicite and sandstone decreases. Thermal cycling leads to microcrack-induced damage.</div></div>","PeriodicalId":34140,"journal":{"name":"Open Ceramics","volume":"21 ","pages":"Article 100735"},"PeriodicalIF":2.9,"publicationDate":"2025-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143160358","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Aqueous tape casting of titanium-doped lithium metazirconate (Ti-Li2ZrO3) sheets for solid-state electrolyte applications

IF 2.9 Q1 MATERIALS SCIENCE, CERAMICS

Open Ceramics

Pub Date : 2025-01-09 DOI: 10.1016/j.oceram.2025.100737

Nicolás Gabriel Orsetti , Domingo Pérez-Coll , Gabriel Lorenzo , Rodrigo Moreno , Gustavo Suárez

Ti-doped lithium zirconate (LZTO) sheets were successfully made by aqueous tape casting, by starting from an innovative colloidal synthesis route and optimizing the colloidal processing parameters. Zeta potential and particles size measurements, together with rheological characterization, were performed to adjust the slip composition. Then, the suspension with 1.0 wt% of ammonium polyacrylate dispersant (APA) and solid loading of 31 vol.% resulted in flat and flexible sheets, thinner than 450 µm, by adding 20 wt% of acrylic binder emulsion. After annealing at 1150 °C/15 h, LZTO sheets densified up to 85.5 %, presented a microstructure with grains of 6.4 µm in diameter, and exhibited electrical conductivity values in the order of 10⁻⁷, 10⁻⁶ and 10⁻⁵ S·cm⁻¹ at 350, 450 and 600 °C, respectively. Besides, XRD phase analysis revealed monoclinic Li₂ZrO₃ and minor ZrO₂ impurities originated from Li₂O volatilization during sintering, but no sign of TiO₂ segregation, indicating the formation of Li₂Zr_1-XTi_XO₃ solid solution.

{"title":"Aqueous tape casting of titanium-doped lithium metazirconate (Ti-Li2ZrO3) sheets for solid-state electrolyte applications","authors":"Nicolás Gabriel Orsetti , Domingo Pérez-Coll , Gabriel Lorenzo , Rodrigo Moreno , Gustavo Suárez","doi":"10.1016/j.oceram.2025.100737","DOIUrl":"10.1016/j.oceram.2025.100737","url":null,"abstract":"<div><div>Ti-doped lithium zirconate (LZTO) sheets were successfully made by aqueous tape casting, by starting from an innovative colloidal synthesis route and optimizing the colloidal processing parameters. Zeta potential and particles size measurements, together with rheological characterization, were performed to adjust the slip composition. Then, the suspension with 1.0 wt% of ammonium polyacrylate dispersant (APA) and solid loading of 31 vol.% resulted in flat and flexible sheets, thinner than 450 µm, by adding 20 wt% of acrylic binder emulsion. After annealing at 1150 °C/15 h, LZTO sheets densified up to 85.5 %, presented a microstructure with grains of 6.4 µm in diameter, and exhibited electrical conductivity values in the order of 10<sup>−7</sup>, 10<sup>−6</sup> and 10<sup>−5</sup> S·cm<sup>−1</sup> at 350, 450 and 600 °C, respectively. Besides, XRD phase analysis revealed monoclinic Li<sub>2</sub>ZrO<sub>3</sub> and minor ZrO<sub>2</sub> impurities originated from Li<sub>2</sub>O volatilization during sintering, but no sign of TiO<sub>2</sub> segregation, indicating the formation of Li<sub>2</sub>Zr<sub>1-X</sub>Ti<sub>X</sub>O<sub>3</sub> solid solution.</div></div>","PeriodicalId":34140,"journal":{"name":"Open Ceramics","volume":"21 ","pages":"Article 100737"},"PeriodicalIF":2.9,"publicationDate":"2025-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143160263","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Boosting the optical, physical, and gamma-ray attenuation capabilities of barium borate glasses through the addition of Y2O3 and PbO2

IF 2.9 Q1 MATERIALS SCIENCE, CERAMICS

Open Ceramics

Pub Date : 2025-01-08 DOI: 10.1016/j.oceram.2025.100736

K.A. Mahmoud , M.I. Sayyed , Shrikant Biradar , Yasser Maghrbi

The objective of the current study is to develop a new glass series for hybrid uses in optical and γ-ray protective applications. The mentioned glass series is composed of high-purity oxides according to the chemical formula of (10+x)PbO₂+23BaO+10CaO+(55-x)B₂O₃+2Y₂O₃; x = 0, 3, 6, and 9 mol% under a melting temperature of 1100 °C. The impact of PbO₂ on the optical properties of the prepared glasses was examined using the T-7200 UV–Vis spectrophotometer. The increase in PbO₂ concentration throughout 10–19 mol% decreases the band gap within the glasses over the ranges of 2.945–2.684 eV (for direct transition) and 2.546–1.975 eV (for indirect transition). Additionally, the refractive index of the prepared glasses increased from 2.531 to 2.747 when the PbO₂ concentration raised within the prepared glasses throughout 10–19 mol%. The radiation shielding ability for prepared glasses was evaluated over the energy interval of 0.015–15 MeV using the Monte Carlo simulation. An increase in PbO₂ concentration throughout 10–19 mol% raises the linear attenuation coefficient (LAC) of prepared glasses over the ranges of 178.961–255.807 cm^–1 (0.015 MeV), 0.304–0.354 cm^–1 (0.8 MeV), and 0.137–0.168 cm^–1 (10 MeV), respectively. The LAC enhancement reduced the thickness equivalent lead, the transmission factor of the prepared glass samples.

{"title":"Boosting the optical, physical, and gamma-ray attenuation capabilities of barium borate glasses through the addition of Y2O3 and PbO2","authors":"K.A. Mahmoud , M.I. Sayyed , Shrikant Biradar , Yasser Maghrbi","doi":"10.1016/j.oceram.2025.100736","DOIUrl":"10.1016/j.oceram.2025.100736","url":null,"abstract":"<div><div>The objective of the current study is to develop a new glass series for hybrid uses in optical and γ-ray protective applications. The mentioned glass series is composed of high-purity oxides according to the chemical formula of (10+<em>x</em>)PbO<sub>2</sub>+23BaO+10CaO+(55-x)B<sub>2</sub>O<sub>3</sub>+2Y<sub>2</sub>O<sub>3</sub>; <em>x</em> = 0, 3, 6, and 9 mol% under a melting temperature of 1100 °C. The impact of PbO<sub>2</sub> on the optical properties of the prepared glasses was examined using the T-7200 UV–Vis spectrophotometer. The increase in PbO<sub>2</sub> concentration throughout 10–19 mol% decreases the band gap within the glasses over the ranges of 2.945–2.684 eV (for direct transition) and 2.546–1.975 eV (for indirect transition). Additionally, the refractive index of the prepared glasses increased from 2.531 to 2.747 when the PbO<sub>2</sub> concentration raised within the prepared glasses throughout 10–19 mol%. The radiation shielding ability for prepared glasses was evaluated over the energy interval of 0.015–15 MeV using the Monte Carlo simulation. An increase in PbO<sub>2</sub> concentration throughout 10–19 mol% raises the linear attenuation coefficient (LAC) of prepared glasses over the ranges of 178.961–255.807 cm<sup>–1</sup> (0.015 MeV), 0.304–0.354 cm<sup>–1</sup> (0.8 MeV), and 0.137–0.168 cm<sup>–1</sup> (10 MeV), respectively. The LAC enhancement reduced the thickness equivalent lead, the transmission factor of the prepared glass samples.</div></div>","PeriodicalId":34140,"journal":{"name":"Open Ceramics","volume":"21 ","pages":"Article 100736"},"PeriodicalIF":2.9,"publicationDate":"2025-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143160264","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Analysis of the structure and magnetic behaviour of cobalt phase in polycrystalline diamond compacts

IF 2.9 Q1 MATERIALS SCIENCE, CERAMICS

Open Ceramics

Pub Date : 2025-01-07 DOI: 10.1016/j.oceram.2025.100734

T.T. Ngwekhulu , D.J. Whitefield , I. Sigalas , H.S.L. Sithebe , S.R. Naidoo

Three variants of Polycrystalline Diamond (PCD) cutters were manufactured by High Pressure and High Temperature (HPHT) with varying diamond grain sizes ranging from 4 to 25 μm with a Tungsten Carbide (WCCo) substrate base. The structure and magnetic profiles of the PCD tables were analysed using KOERZIMAT 1.097 MS, Scanning Electron Microscopy (SEM), Image Analysis (IA), and Inductively Coupled Plasma Atomic Emission Spectroscopy (ICP-AES). The study revealed that the size of the PCD table specimen does not impact the magnetic saturation. A relationship was observed between the amount of metal phase and the magnetic saturation level and the cobalt mean-free path and coercivity were found to be correlated. The PCD layers separated from the substrates revealed that larger diamond compact grain sizes decrease metallic cobalt phase magnetic domains. However, this also leads to a decrease in coercivity due to a decrease in cobalt content. In addition, it is worth noting that the dissolved tungsten (W) remained constant in all three variants. This indicates that the diamond grain size and the presence of the cobalt phase did not impact the amount of dissolved W during the synthesis process. The starting fine grain size (average of 4 μm) led to a magnetic saturation value of 15.56 % after sintering, medium grain size (average of 13 μm) with a saturation value of 13.88 %) while the coarse grain size (average of 25 μm) resulted in a magnetic saturation value of 11.86 %. The observed phenomena can be explained by the increased size of the diamond grains, which leads to a decrease in the cobalt concentration.

{"title":"Analysis of the structure and magnetic behaviour of cobalt phase in polycrystalline diamond compacts","authors":"T.T. Ngwekhulu , D.J. Whitefield , I. Sigalas , H.S.L. Sithebe , S.R. Naidoo","doi":"10.1016/j.oceram.2025.100734","DOIUrl":"10.1016/j.oceram.2025.100734","url":null,"abstract":"<div><div>Three variants of Polycrystalline Diamond (PCD) cutters were manufactured by High Pressure and High Temperature (HPHT) with varying diamond grain sizes ranging from 4 to 25 μm with a Tungsten Carbide (WC<img>Co) substrate base. The structure and magnetic profiles of the PCD tables were analysed using KOERZIMAT 1.097 MS, Scanning Electron Microscopy (SEM), Image Analysis (IA), and Inductively Coupled Plasma Atomic Emission Spectroscopy (ICP-AES). The study revealed that the size of the PCD table specimen does not impact the magnetic saturation. A relationship was observed between the amount of metal phase and the magnetic saturation level and the cobalt mean-free path and coercivity were found to be correlated. The PCD layers separated from the substrates revealed that larger diamond compact grain sizes decrease metallic cobalt phase magnetic domains. However, this also leads to a decrease in coercivity due to a decrease in cobalt content. In addition, it is worth noting that the dissolved tungsten (W) remained constant in all three variants. This indicates that the diamond grain size and the presence of the cobalt phase did not impact the amount of dissolved W during the synthesis process. The starting fine grain size (average of 4 μm) led to a magnetic saturation value of 15.56 % after sintering, medium grain size (average of 13 μm) with a saturation value of 13.88 %) while the coarse grain size (average of 25 μm) resulted in a magnetic saturation value of 11.86 %. The observed phenomena can be explained by the increased size of the diamond grains, which leads to a decrease in the cobalt concentration.</div></div>","PeriodicalId":34140,"journal":{"name":"Open Ceramics","volume":"21 ","pages":"Article 100734"},"PeriodicalIF":2.9,"publicationDate":"2025-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143160262","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Zinc oxides by thermal decomposition synthesis and parameters affecting electrocatalyst activity for CO2 reduction reaction

IF 2.9 Q1 MATERIALS SCIENCE, CERAMICS

Open Ceramics

Pub Date : 2024-12-28 DOI: 10.1016/j.oceram.2024.100733

Elías Rodríguez-Jara , Margherita Cavallo , Ryosuke Nakazato , Matthias Quintelier , Keeko Matsumoto , Joke Hadermann , Jadra Mosa , Francesca Bonino , Kiyoharu Tadanaga , Mario Aparicio , Nataly Carolina Rosero-Navarro

Electroreduction of CO₂ to obtain fossil fuel-free energy products is a promising avenue reducing anthropogenic greenhouse gas emissions. Catalysts based on Au, Ag and Cu are frequently used. Others based on abundant and low-cost elements such as Zn also report catalytic activity. This work presents a scalable and simple synthesis method of catalysts based on ZnO structures by a controlled thermal decomposition process of Zinc acetate dehydrate. An in-depth study of how modifications of synthesis parameters may affect the final performance of the material as electrocatalyst in CO₂RR is studied. It has been found that higher values of faradaic efficiency to CO evolution were found for samples synthesised at higher temperatures and higher heating ramp, reaching 69 % at -0.8 V vs RHE. It is of great importance to control over the parameters of the thermal decomposition process as they can greatly affect the final catalytic behaviour of the sample.

{"title":"Zinc oxides by thermal decomposition synthesis and parameters affecting electrocatalyst activity for CO2 reduction reaction","authors":"Elías Rodríguez-Jara , Margherita Cavallo , Ryosuke Nakazato , Matthias Quintelier , Keeko Matsumoto , Joke Hadermann , Jadra Mosa , Francesca Bonino , Kiyoharu Tadanaga , Mario Aparicio , Nataly Carolina Rosero-Navarro","doi":"10.1016/j.oceram.2024.100733","DOIUrl":"10.1016/j.oceram.2024.100733","url":null,"abstract":"<div><div>Electroreduction of CO<sub>2</sub> to obtain fossil fuel-free energy products is a promising avenue reducing anthropogenic greenhouse gas emissions. Catalysts based on Au, Ag and Cu are frequently used. Others based on abundant and low-cost elements such as Zn also report catalytic activity. This work presents a scalable and simple synthesis method of catalysts based on ZnO structures by a controlled thermal decomposition process of Zinc acetate dehydrate. An in-depth study of how modifications of synthesis parameters may affect the final performance of the material as electrocatalyst in CO<sub>2</sub>RR is studied. It has been found that higher values of faradaic efficiency to CO evolution were found for samples synthesised at higher temperatures and higher heating ramp, reaching 69 % at -0.8 V vs RHE. It is of great importance to control over the parameters of the thermal decomposition process as they can greatly affect the final catalytic behaviour of the sample.</div></div>","PeriodicalId":34140,"journal":{"name":"Open Ceramics","volume":"21 ","pages":"Article 100733"},"PeriodicalIF":2.9,"publicationDate":"2024-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143160265","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

PSZB glass as a shielding material: Evaluating physical, mechanical, and gamma ray shielding performance

IF 2.9 Q1 MATERIALS SCIENCE, CERAMICS

Open Ceramics

Pub Date : 2024-12-20 DOI: 10.1016/j.oceram.2024.100729

M.I. Sayyed , Chaitali V. More , Ashok Kumar , Yasser Maghrbi

The PbO-SrO-ZnO-B₂O₃ (PSZB) glasses were synthesized through the melt-quenching. The introduction of larger-sized PbO into the glass matrix led to structural alterations, elucidated by a marginal elevation in density and molar volume values from 4.292 g/cm³ to 4.922 g/cm³ and 29.812 cm³ mol⁻¹ to 30.676 cm³ mol⁻¹ respectively. The expansion of the network was found to contribute to the rise in oxygen molar volume (V_o) from 15.691 to 19.173 cm³ mol⁻¹. Phy-X software was used to compute the shielding characteristics theoretically in the energy range of 0.015–15 MeV. The mass attenuation coefficients (MAC), half value layer (HVL) and mean free path (MFP) have been tested against photon energy. The radiation shielding capabilities increased with increasing PbO content. The present glasses' HVL are compared to that of different tellurite glasses at 0.1 and 0.15 MeV. PSZB4 glass with greater PbO content (50 mol%) has shown outstanding gamma radiation shielding properties than its counterparts.

{"title":"PSZB glass as a shielding material: Evaluating physical, mechanical, and gamma ray shielding performance","authors":"M.I. Sayyed , Chaitali V. More , Ashok Kumar , Yasser Maghrbi","doi":"10.1016/j.oceram.2024.100729","DOIUrl":"10.1016/j.oceram.2024.100729","url":null,"abstract":"<div><div>The PbO-SrO-ZnO-B<sub>2</sub>O<sub>3</sub> (PSZB) glasses were synthesized through the melt-quenching. The introduction of larger-sized PbO into the glass matrix led to structural alterations, elucidated by a marginal elevation in density and molar volume values from 4.292 g/cm<sup>3</sup> to 4.922 g/cm<sup>3</sup> and 29.812 cm<sup>3</sup> mol<sup>−1</sup> to 30.676 cm<sup>3</sup> mol<sup>−1</sup> respectively. The expansion of the network was found to contribute to the rise in oxygen molar volume (V<sub>o</sub>) from 15.691 to 19.173 cm<sup>3</sup> mol<sup>−1</sup>. Phy-X software was used to compute the shielding characteristics theoretically in the energy range of 0.015–15 MeV. The mass attenuation coefficients (MAC), half value layer (HVL) and mean free path (MFP) have been tested against photon energy. The radiation shielding capabilities increased with increasing PbO content. The present glasses' HVL are compared to that of different tellurite glasses at 0.1 and 0.15 MeV. PSZB4 glass with greater PbO content (50 mol%) has shown outstanding gamma radiation shielding properties than its counterparts.</div></div>","PeriodicalId":34140,"journal":{"name":"Open Ceramics","volume":"21 ","pages":"Article 100729"},"PeriodicalIF":2.9,"publicationDate":"2024-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143160266","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The latest research progress on MnZn ferrite and their applications

IF 2.9 Q1 MATERIALS SCIENCE, CERAMICS

Open Ceramics

Pub Date : 2024-12-19 DOI: 10.1016/j.oceram.2024.100732

Zhexue Chen , Teng Li , Anping Wang , Minxia Shi , Bangcheng Han

Manganese zinc ferrite (MnZn ferrite), as an important ceramic and soft magnetic material, have attracted great interest due to their unique spinel crystalline structure and excellent electromagnetic properties. Such fascinating materials have been widely applied in various fields, such as transformers, inductors, microwave absorption, magnetic shielding, and sensors. This review provides a comprehensive overview of the synthesis methods, structural characteristics, magnetic properties, and extensive applications of MnZn ferrite. The synthetic strategies including solid-phase reaction, sol-gel, and co-precipitation are discussed, highlighting their impact on the microstructure and magnetic behavior of MnZn ferrite. The impact of different fabrication conditions on permeability, saturation magnetization, low power losses, and coercivity of MnZn ferrite are analyzed. In addition, the widespread applications of MnZn ferrite are explained, emphasizing its significance in modern technology. At the end, the perspectives and challenges toward the future development of MnZn ferrite are discussed.

引用次数: 0

Functionalization of LCD glass for the manufacturing of advanced 3D-printed translucent photocatalytic scaffolds

IF 2.9 Q1 MATERIALS SCIENCE, CERAMICS

Open Ceramics

Pub Date : 2024-12-16 DOI: 10.1016/j.oceram.2024.100731

Elena Colusso , Hamada Elsayed , Paulina Ożóg , Jozef Kraxner , Dusan Galusek , Enrico Bernardo

In this paper, we discuss the functionalization of translucent glass scaffolds obtained from LCD glass waste with a photocatalytic coating. Scaffolds were in the form of four-layer lattices and gyroids, depending on the printing technology, such as direct ink writing and masked stereolithography. The printed structures were dip-coated with a sol-gel TiO₂ precursor solution followed by thermal annealing to induce crystallization. Preliminary tests were performed on LCD slides to optimize the process parameters such as withdrawal speed and annealing temperature. The physicochemical properties of the coatings were characterized by X-ray diffraction analysis, UV–VIS spectroscopy, ellipsometry, and SEM. The photocatalytic efficiency was evaluated by monitoring the degradation of methylene blue under UV light. Photodegradation kinetics were studied following a pseudo-first-order reaction. We found that the coated scaffolds show comparable photodegradation rate constant, despite the different topologies.

引用次数: 0

Tailoring optical properties of (Ce,Pr)O2-δ·(La,Sm,Y)2O3 high entropy oxides by substituting Pr with Gd or Dy for multi-wavelength emission applications

IF 2.9 Q1 MATERIALS SCIENCE, CERAMICS

Open Ceramics

Pub Date : 2024-12-14 DOI: 10.1016/j.oceram.2024.100730

Avnee Chauhan , Enrico Bernardo , Dušan Galusek

High-entropy oxides (HEOs) has generated considerable research interest because of their novel inherent properties and tuneable functionality. In this study, reactive sintering method was used to synthesize HEOs with three different compositions (Ce,RE)O_2-δ·(La,Sm,Y)₂O₃ [RE=Pr], and CeO_2-δ·(RE,La,Sm,Y)₂O₃ [RE=Gd,Dy]. Replacement of Pr cation with Gd or Dy in the synthesized compositions significantly increased the band gap value from 1.8 eV to 3.13 eV and 3.18 eV respectively. The broader band gap improved luminescent properties of bulk ceramic samples. Strong emissions originating from Ce³⁺, Dy³⁺and Sm³⁺ in Dy-containing HEO and from Ce³⁺, Gd³⁺ and Sm³⁺in Gd- containing HEO were observed at multiple wavelengths through entire visible region. Under multi-wavelength excitation, effective regulation of the emission colour was achieved, resulting in enhanced photoluminescence performance. The prepared HEOs, CeO_2-δ·(RE,La,Sm,Y)₂O₃ [RE=Gd,Dy] can be considered as a novel materials for white light application (WLED) with excitation at multiple wavelengths and tuneable emission.

{"title":"Tailoring optical properties of (Ce,Pr)O2-δ·(La,Sm,Y)2O3 high entropy oxides by substituting Pr with Gd or Dy for multi-wavelength emission applications","authors":"Avnee Chauhan , Enrico Bernardo , Dušan Galusek","doi":"10.1016/j.oceram.2024.100730","DOIUrl":"10.1016/j.oceram.2024.100730","url":null,"abstract":"<div><div>High-entropy oxides (HEOs) has generated considerable research interest because of their novel inherent properties and tuneable functionality. In this study, reactive sintering method was used to synthesize HEOs with three different compositions (Ce,RE)O<sub>2-δ</sub><strong>·</strong>(La,Sm,Y)<sub>2</sub>O<sub>3</sub> [RE=Pr], and CeO<sub>2-δ</sub><strong>·</strong>(RE,La,Sm,Y)<sub>2</sub>O<sub>3</sub> [RE=Gd,Dy]. Replacement of Pr cation with Gd or Dy in the synthesized compositions significantly increased the band gap value from 1.8 eV to 3.13 eV and 3.18 eV respectively. The broader band gap improved luminescent properties of bulk ceramic samples. Strong emissions originating from Ce<sup>3+</sup>, Dy<sup>3+</sup>and Sm<sup>3+</sup> in Dy-containing HEO and from Ce<sup>3+</sup>, Gd<sup>3+</sup> and Sm<sup>3+</sup>in Gd- containing HEO were observed at multiple wavelengths through entire visible region. Under multi-wavelength excitation, effective regulation of the emission colour was achieved, resulting in enhanced photoluminescence performance. The prepared HEOs, CeO<sub>2-δ</sub><strong>·</strong>(RE,La,Sm,Y)<sub>2</sub>O<sub>3</sub> [RE=Gd,Dy] can be considered as a novel materials for white light application (WLED) with excitation at multiple wavelengths and tuneable emission.</div></div>","PeriodicalId":34140,"journal":{"name":"Open Ceramics","volume":"21 ","pages":"Article 100730"},"PeriodicalIF":2.9,"publicationDate":"2024-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143159385","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Influence of annealing temperature on the photocatalytic efficiency of sol-gel dip-coated ZnO thin films in methyl orange degradation

IF 2.9 Q1 MATERIALS SCIENCE, CERAMICS

Open Ceramics

Pub Date : 2024-12-13 DOI: 10.1016/j.oceram.2024.100727

A.H. Haritha , M.E. Cruz , O. Sisman , A. Duran , D. Galusek , J.J. Velázquez , Y. Castro

ZnO thin films on glass substrates and silicon wafers were prepared by the sol-gel dipcoating technique and annealed at temperatures ranging from 300 - 550 °C. X-ray diffraction (XRD) and Raman analysis confirm the hexagonal wurtzite structure of ZnO. Scanning electron microscopy (SEM) examination confirmed that the films were homogeneous, crack-free and with a uniform distribution of nano-sized spherical grains. The decomposition of methyl orange (MO) using a solar simulator was used to determine the photocatalytic activity of the thin films. The annealing temperature was found to have a significant influence on the structure, morphology, and photocatalytic performance of ZnO thin films. The best photocatalytic activity under solar irradiation was shown by the ZnO thin film annealed at 450 °C. The enhanced photocatalytic performance of the films can be attributed to their optimized crystallinity, surface roughness and morphology, which provide more active sites for the photocatalytic reactions.

引用次数: 0

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