Journal of the Australian Ceramic Society
Number of Followers: 0 Hybrid journal (It can contain Open Access articles) ISSN (Print) 2510-1560 - ISSN (Online) 2510-1579 Published by Springer-Verlag [2468 journals] |
- Structural and biological properties of hydroxyfluorapatite containing
sodium and potassium and substituted with carbonates bioceramics for bone
tissue engineering-
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Abstract: Abstract Calcium phosphates are extensively utilized in the biomedical domain, specifically in dentistry and orthopedics, owing to their chemical resemblance to the mineral constituent of hard tissue. Ions substitutions within the apatite lattice play a vital role in cell-biological interaction and organ metabolism. Here, a serial of hydroxyapatite bioceramics has been ions-substituted with sodium (Na+), potassium (K+), carbonate (CO32−), and fluoride (F−). The general formula for the compounds is Ca(9.75−y/2)(Na, K)0.25(PO4)6−y(CO3)yOHF (HFAp) with (0 ≤ y ≤ 1). After undergoing analysis and characterization using numerous methods and techniques, the obtained samples were confirmed to be pure apatite. The HFAp structure was found to contain the necessary amounts of introduced substituted ions. The thermal analysis of the samples revealed that the apatite phase was the primary component from room temperature to 1000 °C, whereas the formation of β-Ca3(PO4)2 occurred at a temperature of 750 °C. The pressureless sintering process resulted in achieving a densification ratio of 93% for the samples. The biocompatibility of the samples was studied in-vitro. The interaction between cells and materials was studied using the methyl thiazolyl tetrazolium (MTT) assay with human osteosarcoma cells MG-63 and Saos-2. The biological response resulted in cell proliferation on the materials’ surface. The in vitro bioactivity investigations conducted on materials submerged in Simulated Body Fluid (SBF) demonstrated a remarkably bioactive nature, as indicated by the enhanced mineralization of a new apatite layer. The synthesized biomaterial shows potential for repairing and reconstructing sick body components.
PubDate: 2024-08-06
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- Basic oxygen furnace slag: a sustainable approach to SiO2-Na2O-B2O3-CaO-F
glass-ceramic coating production-
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Abstract: Abstract In this study, basic oxygen furnace slag (BOF) was utilized as a substitute for calcium carbonate (CaCO3) and red iron oxide (Fe2O3) in the production of frit, which serves as the precursor material for glass-ceramics. Two different raw material batches for SiO2-Na2O-B2O3-CaO-F frit were prepared. The batches underwent a melting-quenching process and were classified as frit (F-STD) consisting of 100 wt% commercial raw materials and frit (F-BOF) containing 4.81 wt% BOF slag in its composition. The chemical content, crystalline structure, and thermal behavior of the frits were investigated. F-STD exhibited a TG of 599.8 °C, with corresponding TC1 and TC2 values of 642.2 °C and 871 °C, respectively. F-BOF displayed a TG of 592.9 °C, along with TC1 and TC2 values measured at 636.6 °C and 861 °C. The powdered frits were applied on steel substrates (DC04EK) using the wet spray method and subsequently heat-treated at 840 °C for 4.5 min to obtain a reference (GC-STD) and partially sustainable (GC-BOF) glass-ceramic coatings. The phase formation, microstructure, adherence, and chemical corrosion resistance of the coatings were compared. The coatings were found to be in the optimum adhesion class, numbered 1, according to the BSI EN10209 standard. Analysis of the GC-STD, with an average bubble size of 29.12 μm, and GC-BOF, with an average bubble size of 34.2 μm, revealed fewer and larger diameter bubbles in the sustainable composition. Fluorite (CaF2) and fluorapatite (Ca5(PO4)3F) crystal phases were detected in both samples. The compatibility of BOF slag in glass-ceramic coating formulation was demonstrated by identical characteristics exhibited by GC-STD and GC-BOF.
PubDate: 2024-08-06
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- Structural investigations, enhanced dielectric and electrical
characteristics of iron-doped Bi2O3 thin films designed for high-frequency
applications-
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Abstract: Abstract Herein thin films of bismuth oxide are doped with iron by the thermal deposition technique under a vacuum pressure of 10–5 mbar. The doping content varied in the range of 3.0 wt.% to 13.0 wt.%. It is found that undoped and Fe-doped Bi2O3 films exhibited monoclinic structure with lattice parameters of \(a=7.9765\;\overset\circ A,\;b=7.1253\;\overset\circ A,\;c=4.5964\;\overset\circ A\) and \(\beta =102.203^\circ\) and space group \(8/Lc140\) . Fe-doping below the solubility limit (13.0 wt %) resulted in smaller crystallites, larger strains and larger defect densities. Above the solubility limits orthorhombic Fe2O3 occupied 30.6% of the total phase of Bi2O3 films. Fe-doped Bi2O3 films showed lower dielectric constant value, lower electrical conductivities and larger microwave cutoff frequencies. Analyses of the ac conductivity spectra indicated that the ac conduction is dominated by the correlated barrier hopping. The increased doping level below the solubility limit decreased the density of localized states near Fermi level and increased the correlated barrier height. It is also observed that 3.0 wt% of Fe can improve the cutoff frequency from 133 to 160 GHz. The cutoff frequency spectra of pure and doped samples displayed values that suits 6G waveguides, field effect transistors, and other high-frequency applications.
PubDate: 2024-08-03
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- Influence of introducing TiO2 on densification and thermal shock
resistance of Al2O3-MgO-CaO-Y2O3 materials-
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Abstract: Abstract To develop a novel refractory system for cleaner steelmaking and alloy smelting, Al2O3-MgO-CaO-Y2O3 materials were successfully synthesized via the solid-phase method, utilizing Al2O3-MgO-CaO as well as Y2O3 as the primary raw materials, with TiO2 serving as an additive. The impact of TiO2 on the sintering behavior, mechanical properties, and thermal shock resistance of the material was further investigated to elucidate its influence mechanism. The findings reveal that the addition of TiO2 led to an increase in the volume shrinkage ratio of the samples from 23.40% to 30.14%, a decrease in bulk density from 3.11 g·cm−3 to 2.85 g·cm−3, and an increase in apparent porosity from 9.52% to 18.00%. Furthermore, the cold compressive strength of the samples decreased from 108.6 MPa to 54.64 MPa, and the residual strength ratio after three cycles of thermal shock decreased from 78.10% to 66.14%. The internal structure of the material primarily consists of MgAl2O4, Al5Y3O12, and CaAl2O4 phases, formed at different reaction stages (initial, intermediate, and final stages). The formation conditions of these crystal phases significantly influence the microstructure and properties of the material. Upon the addition of 6 wt% TiO2, numerous Al2TiO5 and Mg2TiO4 precipitate from the continuous liquid phase during cooling, along with partially unreacted Al2O3. These grains exhibit relatively small size and high content, leading to an increase in energetically mismatched grain boundaries and interfaces among the internal grains, thereby augmenting the overall structural inhomogeneity of the material. Consequently, this diminishes the mechanical property and thermal shock resistance of the materials.
PubDate: 2024-08-03
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- Facile synthesis of Mn-doped CdS nanoparticles on carbon quantum dots:
towards efficient photocatalysis-
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Abstract: Abstract This study explores the synthesis and application of carbon quantum dots (CQDs)-based composite photocatalysts, including CQDs, CdS@CQDs, and Mn-doped CdS@CQDs, for the degradation of methylene blue (MB) and Reactive Black 5 (RB5) through photocatalysis. The synthesis of the photocatalysts involved a meticulous procedure utilizing olive oil as a precursor. Characterization studies employing transmission electron microscopy (TEM), X-ray diffractometer (XRD), and Brunauer-Emmett-Teller (BET) surface area confirmed the successful synthesis of the composite photocatalysts with well-dispersed nanoparticles and varying surface areas. Photocatalytic degradation experiments revealed that Mn-doped CdS@CQDs exhibited the highest degradation efficiency for both MB and RB5 under optimized reaction conditions, with pH identified as the most significant parameter, and statistical analyses supported the validity of the experimental data. Based on the results, the highest MB degradation efficiency (99.87%) was achieved at the following reaction conditions: pH = 9, catalyst amount = 0.55 g/L and initial hydrogen peroxide concentration (HPC) = 1 mM while the highest RB5 degradation efficiency (98.15%) was obtained at the following reaction conditions: pH = 3, catalyst amount = 1 g/L and HPC = 0.55 mM. Comparison with the literature showcased the competitive performance of the synthesized photocatalysts, achieving higher efficiencies with lower amounts of photocatalysts and hydrogen peroxide. Kinetic studies revealed that the first-order reaction kinetic was observed in both MB and RB5 degradation. This comprehensive investigation underscores the potential of Mn-doped CdS@CQDs as efficient photocatalysts for wastewater treatment, offering insights for future research and application in environmental remediation efforts.
PubDate: 2024-08-01
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- Ytterbium-doping contribution to the overall dielectric and electrical
properties of (Sr, Ba)Bi2Ta2O9 ceramics-
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Abstract: Abstract In this work, Yb-doped Sr0.95Ba0.05Bi2Ta2O9 powders were synthesized by the citric acid-assisted method. The prepared powders were uniaxially pressed and sintered at different temperatures. Structure, morphology, and dielectric properties were investigated. The use of either a 1200 °C sintering temperature or motifs for a reduction tanδ purpose. The results showed that Yb has not caused a significant change in dielectric properties at low temperatures, thus indicating its ability to reduce dielectric loss smoothly. At high temperatures, the introduction of ytterbium elements could reduce both Curie temperature and conductivity. According to Jonscher’s universal power law, the correlated barrier-hopping (CBH) model describes the AC conductivity mechanism. However, the non-overlapping small polaron tunneling (NSPT) model may be used to show that this is only possible at a specific temperature. The Arrhenius law and the CBH module provide estimates of the various energy barriers that space charges should overcome; however, these barriers get higher as the dopant concentration rises.
PubDate: 2024-08-01
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- Plant-mediated green route to the synthesis of zinc oxide nanoparticles:
in vitro antibacterial potential-
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Abstract: Abstract The plant-mediated, sustainable, facile, eco-friendly, and simple green approaches for the fabrication of metal oxide nanoparticles (NPs) have recently attracted the ever-increasing attention of the scientific community. To date, there has not been any research on green synthesis of ZnO-NPs by Piper guineense (Uziza) seeds widely used as a therapeutic agent is the novelty of the current study. The bioaugmented ZnO-NPs have been manufactured by Uziza seed extract using zinc acetate dihydrate as the precursor and sodium hydroxide with calcination. The hexagonal/spherical crystalline structure at high purely with a mean size of 7.39 nm was confirmed via XRD and SEM analyses of ZnO-NPs. A strong absorption peak at about 350 nm, specific for ZnO-NPs, was observed by a UV-visible spectrometer. The optical bandgap of ZnO-NPs was estimated as about 3.58 eV by the Kubelka-Munk formula. FTIR findings indicated the presence of biofunctional groups responsible for the bioreduction of bulk zinc acetate to ZnO-NPs. The growth rates of E. coli (ATCC 25,922) significantly decreased with ZnO-NPs exhibited compared to the controls. This is making ZnO-NPs promising effective candidates for medical sectors and environmental applications. This current study is hoped to supply a better understanding of the phytosynthesis of ZnO-NPs and promote the advance of green approaches based on plants.
PubDate: 2024-07-30
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- Self-propagating high temperature synthesis (SHS) of ZrC-TiC
nanocomposites: Comparison of Mg and Al reductant usage and process
optimization-
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Abstract: Abstract This study investigated the production of ZrC-TiC composite nanopowders by SHS process in TiO2-ZrO2-C-Mg/Al systems. Mg and Al charge stoichiometries and composite charge stoichiometries were optimized for SHS processes. The most precise procedural stages were identified for refining the SHS product; acid concentrations were optimized for Mg usage and an innovative chemical method was developed to eliminate and/or decrease the amount of Al2O3 by-product, enabling the utilization of Al. Thermochemical simulations were conducted for thermodynamic evaluations (adiabatic temperature and specific heat) and characterizations were performed by XRD and SEM-EDS analysis. The findings indicated that utilizing both reductants allowed for the synthesis of ZrC-TiC-(Al2O3) particles that have considerable surface area and commercial purity. The outcomes demonstrated that Magnesium is a more effective reductant, yet Aluminium, also serves as a viable reductant, even though leading to an increase in process steps, but enabling in-situ formation of sinterability and toughness enhancing Al2O3. A novel chemical route including pre-acid leaching, NaOH fusion, water leaching, HCl leaching was identified for the synthesis of ZrC-TiC-Al2O3 composite powder where the amount of Al2O3 could be organized (according to the desired mechanical properties) by optimization.
PubDate: 2024-07-25
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- Evaluating pumice as a sustainable raw material in porcelain tile
production: impact on technical properties-
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Abstract: Abstract Pumice, a porous rock resulting from the rapid cooling of tuff fragments during volcanic activity, exhibits a spongy texture and light color due to its low density. Found predominantly in Central Anatolia and Eastern Anatolia, it has drawn interest for industrial applications. This study delved into utilizing micronized pumice within the porcelain tile manufacturing process. Comparative analyses were conducted between formulations incorporating micronized pumice and the standard ceramic tile recipe. In place of feldspar, micronized pumice was introduced at concentrations of 3%, 5%, and 7%, while clay was substituted with micronized pumice at concentrations of 3%, 5%, 7%, and 10% by weight. The prepared bodies were fired in an industrial kiln at 1210 °C for 54 min, and various physical and mechanical properties were evaluated. These included viscosity, sieve residue, green strength pre-firing, firing shrinkage, water absorption, firing strength, and firing color after-firing. The results indicated that the samples incorporating micronized pumice closely matched the physical and mechanical properties of the standard porcelain tile. Phase and microstructural analyses revealed the presence of mullite and quartz phases. Notably, micronized pumice demonstrated promise as a substitute for clay or feldspar, with the optimal usage rate determined to be 7% in the porcelain tile recipe. This indicates that pumice has the potential to be an alternative raw material in the production of porcelain tiles.
PubDate: 2024-07-24
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- Fabrication of composite nanoparticles via electrostatic assembly and its
application in ceramics preparation-
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Abstract: Abstract Nanomaterials exhibit properties not seen in large-scale materials; therefore, they have been developed for different applications. Top-down and bottom-up approaches are used to design and fabricate composite materials. Electrostatic assembly (ESA) is a bottom-up approach to material design. In this study, SiO2‒SiO2 composite nanoparticles were selected as a model to demonstrate the feasibility of fabricating composite particles via ESA. In addition, researchers have been studying the fabrication of high-density Al2O3 (which has a theoretical density of approximately 3.95 g ml− 1) at moderate temperatures for a long time. In this study, composite particles consisting of small Al2O3 particles (low sintering temperature) surrounding large Al2O3 particles (high sintering temperature) were fabricated via ESA. The sintered bodies of Al2O3 composite particles obtained at 1350 °C for 2 h had a density of approximately 3.0 g cm− 3, which exceeded that of sintered bodies of only high-temperature-sintered Al2O3 (2.8 g cm− 3).
PubDate: 2024-07-22
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- Interfacial solar vapor generation using sawdust hydrochar/titanium
dioxide composite as photothermal conversion material-
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Abstract: Abstract Carbon based composite has gained interest as a photothermal conversion material for interfacial solar vapor generation towards the generation of clean water through solar– thermal conversion. In this study, successful synthesis of a carbon/ceramic composite containing sawdust hydrochar (SHC) and titanium dioxide (TiO2) was obtained through a simple mixing method. The SHC/TiO2 composite was characterized by scanning electron microscope (SEM), transmission electron microscope (TEM), energy dispersive X-ray (EDX), Fourier-Transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and ultraviolet–visible spectrophotometry (UV–Vis). SEM showed the simple mixing method only minimally damaged the SHC structure, while TEM revealed the integration of TiO2 on the surface of SHC. The existence of the TiO2 elements and various functional groups detected in the EDX, FTIR, and XPS proved the successful integration of TiO2. UV-Vis displayed the SHC/TiO2 had improved light absorption ability in contrast to the SHC and TiO2. The SHC/TiO2 based solar absorber (SHC/TiO2–SA) was fabricated using dip-coating method and utilized for interfacial solar vapor generation in seawater desalination. The interfacial solar vapor generation was conducted outdoors with an average solar intensity of 1.15 kW/m2 where the SHC/TiO2–SA showed the highest average efficiency (76.3 ± 4.6%) and evaporation rate (1.29 ± 0.15 kg/m2.h). While the salinity (180 ppm) and pH (6.97) of the collected clean water was within the World Health Organization drinking water standard.
PubDate: 2024-07-18
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- Development of ceramic layer on magnesium and its alloys for bone implant
applications using plasma electrolytic oxidation (PEO)-
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Abstract: Abstract The use of magnesium (Mg) and its alloys as potential materials for bone implants is gaining attention of researchers. This is due to their biocompatibility, mechanical properties, and ability to degrade in the body. Plasma Electrolytic Oxidation (PEO) is a promising surface modification technique for enhancing the performance of magnesium and its alloys in orthopedic and dental implants. It helps develop an oxide ceramic layer on the surface. This article provides an in-depth analysis of the recent advancements in PEO of magnesium and related alloys for use in bone implants. It begins by explaining the fundamental principles of PEO, including the electrochemical and plasma processes involved in forming ceramic coatings on magnesium substrates. It then describes how various factors affect the oxide layers. These include the electrolyte mixture, voltage, current density, and treatment length. It focuses on the microstructure, biocompatibility, and corrosion resistance of PEO-treated magnesium alloys. Additionally, it explains the biocompatibility and bioactivity performance of the PEO-coated magnesium alloys. This involves their interactions with biological systems, cell adhesion, proliferation, and osseointegration. The review also covers challenges and limitations of PEO. Its comprehensive analysis of PEO technique, surface characteristics, mechanical properties, corrosion behavior, and biocompatibility aspects is valuable. It's a resource for researchers, clinicians, and materials scientists creating novel, biocompatible magnesium-based materials. These materials are suitable for dental and orthopedic implants. As the field continues to evolve, further research directions and potential breakthroughs are outlined to propel the application of PEO-treated magnesium alloys in the realm of bone implants, offering patients improved medical outcomes and enhanced quality of life.
PubDate: 2024-07-17
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- Enhancement the physical properties of V2O5/Ni0.1Fe2.9O4 nanocomposite
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Abstract: Abstract Nanocomposite containing vanadium oxide (V2O5) and magnetite (Fe3O4) doped with nickel (Ni) ion were synthesized according to the formula of Ni0.1Fe2.9O4 /V2O5. The obtained composition was characterized by XRD, FTIR, FESEM. The FESEM micrograph shows that the existence of two different phases related to V2O5 and Ni-Magnetite. Moreover,the roughness parameters have values of 281, 85 and 385nm for roughness average Ra, root mean square roughness Rq, Maximum height of roughness RT respectively. Moreover, the magnetic behavior of the sample was studied, and we found that by adding V2O5 to Ni dopped magnetite, the curie temperature value was lowered from 750 oC to 625 oC. The activation energy was calculated and found to be 0.22 eV and 0.08 eV for 1000 Hz and 3MHz respectively.
PubDate: 2024-07-15
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- Spodumene glass-ceramics with low thermal expansion coefficient prepared
using gold tailings-
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Abstract: Abstract Spodumene glass-ceramics composed of Li2O-Al2O3-SiO2 were prepared using gold tailings (Shuangqi Mountain, Quanzhou, Fujian, China) as the raw material through a two-step crystallization method. The crystallization behavior, phase structure, and microstructure of the glass-ceramics were characterized by DSC, XRD, and SEM. The results indicate that the addition of gold tailings promoted the precipitation of the β-quartz solid solution and its transformation into β-spodumene solid solution. Dense nanoscale crystal particles have been formed in the crystallized samples, and a high content of gold tailings significantly improved the flexural strength and thermal conductivity of glass-ceramics. Simultaneously, low coefficient of thermal expansion can be obtained at higher crystallization temperatures. Overall, the sample fabricated with 45% gold tailings showed relatively excellent properties at a crystallization temperature of 850 ℃. The coefficient of thermal expansion (CTE), flexural strength, bulk density, and thermal conductivity are 2.38 × 10− 6 K− 1, 87.71 MPa, 2.445 kg m−3, and 3.574 W m− 1K− 1 (500 °C), respectively. This work verifies the possibility of using gold tailings as raw materials for the preparation of lithium spodumene glass-ceramics, which have potential for large-scale commercial applications.
PubDate: 2024-07-15
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- Analyzing the variations in electrical, structural and magnetic properties
of zinc-doped MnFe2O4 ferrite obtained via co-precipitation-
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Abstract: Abstract Zinc-incorporated manganese ferrite in polyvinylpyrrolidone matrices was successfully synthesized via a co-precipitation method at 1000 °C. Zn2+ doping was found to have a notable effect on the structural properties of the sample, as evidenced by XRD results indicating a cubic FCC structure with a ferrite spinel structure. The average crystallite size was 20.61 nm, and the lattice parameters of the samples varied slightly depending on the amount of Zn2+ doping. It was observed that Zn2+ doping increases both the magnetic moment and temperature of the sample. Zn2+ ions possess a large magnetic moment, which interacts with the other ions in the sample, resulting in an increased overall magnetic moment and coercivity. FE-SEM microstructure revealed cauliflower morphology, multiple pores, and rough aggregates. This increased magnetic moment was reflected in a specific capacitance value of 53.518Fg−1 at a scanning rate of 30mVs−1. Impedance analysis reveals that the relaxation phenomenon is highly dependent on concentration and frequency. PVP-coated Zinc-incorporated manganese ferrites are of great importance in technology and science due to their high saturation magnetization and low core losses. These ferrites have been widely utilized in electronic applications, such as magnetic storage devices, sensors, and microwave devices.
PubDate: 2024-07-10
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- NOx treatment’s photocatalytic activity using the
Ag/SnO2/polypropylene-
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Abstract: Abstract Environmental and materials scientists are becoming more interested in catalytic materials for use in filtration and remediation of contaminated gas.. In this study, Ag/SnO2 catalysts were adorned onto a polypropylene (PP) membrane to eliminate nitrogen oxide (NOx) gas. The catalyst-coated membrane achieved an efficiency of 63.62% and exhibited a low generation of nitrogen dioxide (NO2), just 2.51%. It is noteworthy that even after five cycle experiments, the Ag/SnO2/PP catalytic membrane showed remarkable resilience, retaining a high removal efficiency of approximately 58.2%. Furthermore, the catalytic membrane demonstrated a positive trend in transforming NOx into eco-friendly products, hence decreasing the generation of NO2 byproducts. These encouraging findings demonstrate the Ag/SnO2 catalysts' potential for treating contaminated gasses in the near future in catalytic membrane technologies.
PubDate: 2024-07-10
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- Effect of particle size distribution on the properties of celsian based
glazes-
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Abstract: Abstract The microstructure and surface properties of ceramic glaze are influenced by chemical composition, particle size distribution, glaze application conditions, and firing parameters. This study specifically focused on the influence of glaze particle size distribution on the thermal behavior, microstructure, and surface appearance of barium frit based ceramic glaze in the floor tile firing process. The investigation involved examining the impact of four distinct particle size dimensions (d50: 5.7 μm, 6.8 μm, 7.5 μm, 10.9 μm) on the glaze properties by using hot stage microscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), color and gloss measurements. The studies indicated that celsian is the dominant phase in the glaze structure. The sintering and softening temperatures of glazes decreased with the increase of milling time. A decrease in the particle size of the glaze slurry increased the whiteness index. As the average particle size (d50) of the glaze decreased, the number of crystals was also increased. The investigation results also suggested a relation between specular reflection and milling time. As the milling time extended, there was a corresponding increase in the magnitude of glossiness.
PubDate: 2024-07-08
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- Effect of temperature variations on the fabrication of
SLS-Na2CO3-ES-P2O5-CaF2-Al2O3 based bioglass-ceramics-
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Abstract: Abstract Melt-quenching bioglass-ceramics with the following chemical composition have been prepared 44SLS \( -\) 11Na2CO3 \( -\) 24ES \( -\) 6P2O5 \( -\) 6CaF2 \( -\) 9Al2O3 (wt%). The bioglass-ceramics were sintered at 650 °C, 750 °C, 850 °C, and 950 °C. The aim was to identify the optimal sintering temperature before glass crystallization. The physical properties were characterized by density and linear shrinkage. To characterize the structure properties, X-ray diffraction (XRD), scanning electron microscopy (SEM), and Fourier transform infrared spectroscopy (FTIR) were utilized. The high composition of Si and Ca in soda lime silica (SLS) glass and eggshells (ES), respectively, encourage the utilization of waste materials in the production of bioglass-ceramics. The results showed that at a sintering temperature of 950 °C, the crystallization of fluorapatite was the main phase. Moreover, the high density and optimum linear shrinkage were obtained as the sintering temperature increased. Additionally, grain growth and densification took place at this temperature. The compressive strength of bioglass-ceramics is influenced by sintering temperature and the optimal compressive strength is 136.58 MPa.
PubDate: 2024-07-08
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- Synthesis of three-component bioactive glass SiO2– CaO– P2O5 by
hydrothermal method using oleic acid as a surfactant-
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Abstract: Abstract This work presents the synthesis of bioactive glass 55SiO2– 41CaO– 4P2O5 (mol%) by the hydrothermal method using oleic acid as a structural-control agent. Glass samples synthesized at different oleic acid concentrations 0 M, 0.25 M, 0.5 M, and 1 M (denoted as 55 S-0 M, 55 S-0.25 M, 55 S-0.5 M, 55 S-1 M) were characterized by physic-chemical methods such as TGA-DCS, XRD, FTIR, SEM, TEM, and BET. According to the findings, glass materials in the form of amorphous and mesoporous structures can be synthesized by heating dried gel at about 700 oC. The formation of sharp hydroxyapatite peaks after in vitro experiment shows higher bioactivity in samples 55 S-0.25 M, and 55 S-0.5 M, which have higher porosity, and specific surface area. Furthermore, all glass samples synthesized in oleic acid demonstrate excellent biocompatibility with fibroblast cells (L-929).
PubDate: 2024-07-08
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- Study of thermal shock resistance of HVAF spraying thickness gradient
WC-Cr3C2-Ni coating on crystallizer surface-
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Abstract: Abstract The heat distribution and wear threat of the plate crystallizer used in continuous casting production are different in each area, and a single-thickness coating is unable to fulfill the requirements of all areas. To extend the service life of the crystallizer, a high hardness WC-Cr3C2-Ni thickness gradient wear-resistant coating was prepared on the inner wall of the crystallizer via the HVAF (High-Velocity Air Fuel) spraying technology. In cyclic thermal shock environments, the thermal shock resistance of planar coatings decreased with the thickness. The coating with a thickness of 100 μm exhibited the best thermal shock resistance, with up to 25 cycles at 800 °C thermal shock. In high-temperature wear experiments simulating actual service environments, the 300 μm coating, which owned the worst theoretical thermal shock resistance, was well bonded to the substrate and exhibited good serviceability. Comprehensive experimental results showed that the WC-Cr3C2-Ni coatings deposited by HVAF were stable in practical long-cycle production. The coating preparation process proposed in this paper has been applied in domestic steel mills, effectively extending the working cycle of the production line and improving economic efficiency. This study will provide a theoretical basis for the selection and preparation of surface coatings for continuous casting crystallizers and other structures in complex service environments.
PubDate: 2024-07-05
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