Journal of Asian Ceramic Societies

Sagawa, Takuya; Kako, Noritaka; Nakaya, Masatoshi; Izumi, Takaaki; Takeda, Kosuke; Iijima, Kazutoshi; Hashizume, Mineo

doi: 10.1080/21870764.2024.2445444pmid: N/A

Recently, fabrication of organic-inorganic hybrid biomedical materials using biomimetic mineralization processes has received attention because it proceeds under mild conditions and biocompatible inorganic components are incorporated in the resulting hybrids. In the present study, the preparation of anionic polyelectrolyte-apatite hybrids, having potential as a biomedical material, in simulated body fluids (SBFs) was performed. Anionic polyelectrolytes such as heparin, poly(4-styrene sulfonate) (PSS), or poly(vinyl sulfate) (PVS) were added to SBFs and incubated to induce nucleation of hydroxyapatite, which resulted in the formation of anionic polyelectrolyte-apatite hybrids. Physical characterization of the resulting deposits in SBFs using scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), FT-IR spectroscopy, and X-ray diffraction (XRD) revealed that the polyelectrolyte concentration affected the yield of the resulting deposits. It seemed that the reaction condition affected the apatite nucleation process in SBFs. Effect of chemical structures and concentrations of anionic polyelectrolytes on hybrid formation is discussed.

Wannasut, Pimpilai; Khamman, Orawan; Jaita, Pharatree; Promsawat, Methee; Patthanavarit, Jira; Watcharapasorn, Anucha

doi: 10.1080/21870764.2024.2426830pmid: N/A

In this work, the complex lead-free piezoelectric ceramics with formula (1 − x)[0.995 Bi0.5(Na0.80K0.20)0.5TiO3–0.005LiNbO3]–xFe2O3, where x = 0, 0.010, 0.015 and 0.020 mol fraction, have been prepared via a conventional solid-state method. The effects of Fe2O3 doping on the physical, microstructural electrical, energy harvesting and magnetic properties have been systematically investigated. All ceramics were sintered at 1150°C for 2 hours with obtained relative density of ~ 96-97%. The XRD and Raman data revealed the coexisting rhombohedral and tetragonal phases for all samples. SEM image presented angular grain packing with the average grain size range of 0.43–1.03 μm. The addition of Fe2O3 content improved in electrical properties of undoped sample particularly at a composition of x = 0.015. The maximum values of ε m  = 6250, S max  = 0.29, d*33 = 578 pm/V, d 33 = 211 pC/N and FOM = 3.54. All ceramics indicated ferromagnetic behavior with slim hysteresis shape. The results suggest a potential for its applications as an eco-friendly compound for further use in sensor, spintronic and microelectronic devices applications.

Qiu, Jiayong; Zhao, Jingyu; Qi, Dexing; Lv, Xinyue; Mao, Rui; Ju, Dianchun; Wang, Fei; Shao, Jiugang; Yu, Shui; Yao, Haiwei; Li, Zheng; Zhao, Kai; Wen, Yingjiang; Song, Zhenguo

doi: 10.1080/21870764.2024.2430039pmid: N/A

In order to optimize the utilization of blast furnace slag (BFS) and enhance the cost-effectiveness and feasibility of β-SiAlON preparation, a novel approach involving acetic acid leaching-carbothermal reduction and nitridation was proposed. The effects of acid concentration and leaching times on the leaching behavior of BFS were thoroughly investigated. The synthesis mechanism of β-SiAlON was comprehensively explored through thermodynamic analysis, X-ray diffraction, scanning electron microscope and energy dispersive spectroscopy. The results demonstrate that selective leaching of Ca and Mg elements from BFS can be achieved while effectively enriching Si and Al elements in the filter residue. Under optimized leaching conditions, the contents of CaO and MgO in the residue are reduced to below 3% and 1%, respectively. The mass ratio of alumina to silica (w(Al)/w(Si) = 0.3-0.4), the molar ratio of carbon to oxygen (n(C)/n(O) = 0.5), the roasting temperature at 1673 K and the roasting time for 4 hours should be precisely controlled in order to successfully synthesize β-SiAlON from BFS. In summary, the primary reaction pathways for β-SiAlON synthesis from BFS can be described as follows: C4H7AlO5/AlO(OH) transforms into Al2O3, which further reacts with SiO2 to form β-SiAlON; alternatively, Al2O3 reacts with SiO2 to produce mullite, which subsequently converts into β-SiAlON.

Hamdalla, Taymour A.; Darwish, A.A.A.; Khasim, Syed; Aljohani, Meshari M.; Al-Ghamdi, S.A.; El-Zaidia, E.F.M.; Alfadhli, S.

doi: 10.1080/21870764.2024.2435091pmid: N/A

Recently, scientists have been interested in developing advanced techniques for technological applications using sustainable biochar (BC) materials. In this study, poly(3,4-ethylenedioxythiophene) polystyrene sulfonate, PEDOT/PSS, was doped with 5 wt.% and 10 wt.% of Activated biochar (A-BC) obtained from Chlorophyta (green Algae) using a microwave combustion process. XRD, FTIR, TGA, BET, and SEM were used to analyze the structural properties of PEDOT/PSS@BC. The XRD results demonstrate that A-BC impacts the amorphous nature of PEDOT/PSS, causing the doped composite to have a higher crystalline structure. While measuring dark current density-voltage, it was found that PEDOT/PSS@BC/n-Si showed better-rectifying characteristics compared to pristine PEDOT/PSS/n-Si, with a higher rectification ratio. When A-BC was used, the power conversion efficiency (PCE) was 13.02%, with a short circuit current density (Jsc) of 34.37 mA/cm2, open-circuit voltage (Voc) of 0.65 V, and fill factor (FF) of 58%. These findings demonstrated that using A-BC improved the characteristics of PEDOT/PSS/n-Si devices, and the increase in performance was affected by the concentration of A-BC. A-BC can act as an efficient electron acceptor, facilitating charge transfer and reducing recombination losses.

Li, Changqing; Shi, Lifen; Gao, Qiang; Zhang, Xiaoyu; Zhong, Zhaojin; Wang, Pingping; Cao, Xin; Yang, Yong

doi: 10.1080/21870764.2024.2440969pmid: N/A

At recent, medium borosilicate glass is most commonly used as the main material of medical glass at home and abroad. In this paper the influence of B2O3 on the structure and properties of medium borosilicate medical glass was studied in this paper. The glass structure was analyzed by Raman spectra, and the processing properties and the chemical properties of glass were studied. The results showed that when the addition of B2O3 increased, the coefficient of thermal expansion decreased at first and then increased. The chemical stability increased first and then decreased. The transition point, softening point, strain point, annealing temperature, softening point and high temperature viscosity decreased with the increase of the addition of B2O3. ΔT decreased but was always higher than 570°C. The surface tension approaching 350 mN/m decreased first and then increased with the content of B2O3 increased. The prepared glass is suitable for Danner processing.

Han, Kyu-Sung; Yang, Se-Hun; Choi, Yu-Jong; Choi, Jung-Hoon; Hwang, Kwang-Taek; Kim, Ung-Soo; Kim, Jin-Ho

doi: 10.1080/21870764.2024.2444000pmid: N/A

Zircon (ZrSiO4) is widely utilized as an opacifying agent in the glazes of sanitary-ware and ceramic tile. Zircon is dispersed in the glassy phase during the manufacture process of glaze, contributing a high refractive index and enhanced mechanical properties. However, significant price fluctuation and natural radioactivity of zircon have motivated extensive research to find alternative compositions. This study investigates the surface characteristics and radiation properties of sanitary-ware glazes prepared by replacing zircon with SnO2 and CaTiO3 in the raw materials. Analysis of the radioactivity index (I γ ) for glaze raw materials revealed that zircon exhibited the radioactivity index of 9.7, which is significantly higher than that of other mineral-based raw materials. To reduce the radiation emission from glaze, zircon was replaced with CaTiO3 and SnO2, which are radiation-free materials. The glaze prepared using CaTiO3 and SnO2 showed thermal behavior and surface characteristics comparable to those of zircon-containing glaze. Furthermore, the radioactivity index of clay specimen coated with zircon-containing glaze was measured at 1.09, while the radioactivity index of clay specimen coated with zircon-free glaze was significantly reduced to 0.62.

Wang, Zhen; Xu, Renze

doi: 10.1080/21870764.2024.2445935pmid: N/A

In-depth research on the influencing mechanisms of particle size on the crystallization of silicate glass were conducted by calculating the crystallization kinetic parameters using exothermic peaks in differential thermal analysis curves and the Matusita-Sakka equation. A typical silicate glass, CaO-SiO2-B2O3, with a simple crystallization process that forms only one crystal (CaSiO3) was selected as the vehicle for this study. For the as-quenched glass sample, as the particle size distribution shifted from 2.5–1 mm to less than 0.061 mm, the crystal growth dimensionality shifted from a two- to a three-dimensional mechanism. The turning point of the particle size corresponding to the change in crystal growth dimensionality is defined as the boundary between fine and coarse particles and was found to be 0.104 mm. With decreasing particle size, the activation energy for crystal growth decreased slightly in the fine-particle starting material and increased in the coarse-particle starting material; the decrease being considerably higher than the increase. Although the as-quenched glass comprising fine particles is regarded to have saturated nucleation sites, as in the case of well-nucleated samples, it exhibited different crystal growth mechanisms because of its different nucleation mechanisms.

Jin, Zheng Dao; Warshi, Mohammed Kamal; Park, Hee Jung

doi: 10.1080/21870764.2024.2447621pmid: N/A

Metal-supported solid oxide fuel cells are gaining attention for their economic advantages, robust mechanical properties, and resilience to thermal cycling. However, gas transport may be impeded by the dense and irregular microstructure of the metal support, which would reduce electrochemical efficiency. To address this challenge, polymethylmethacrylate, a pore-forming agent that can offer porosity and uniform pore distribution, has been employed in this study. Ni-Fe metal supports with a uniform microstructure have been successfully fabricated by adding the pore former. The porosity of the supports is controlled by varying the amount (0–15 wt%) of the pore former. The electrochemical performance of the Ni-Fe supported solid oxide fuel cells has been then examined. As a result, the highest power density has been achieved in the most porous cell (15 wt%), showing that the more porous the metal support, the better the electrochemical performance.

Shen, Yun; Hong, Du; Sun, Tianfang; Hou, Rui; Zheng, Gong; Niu, Yaran; Chen, Guang

doi: 10.1080/21870764.2024.2447623pmid: N/A

BaZr1-x Y x O3-δ (x = 0, 0.04, 0.08, 0.12) crucibles with doping different contents of Y2O3 were prepared by the pressureless sintering method, and the interfacial reaction behaviors in TiAl alloy melt was investigated using vacuum induction melting. The results revealed that the BaZrO3 ceramics contained a small amount of monoclinic ZrO2 and Ba-rich areas. With increasing Y2O3 doping content, yttrium-rich cubic ZrO2 instead of monoclinic ZrO2 generated and the average grain size decreased significantly. The results after melting showed that the thickness of the reaction layer of the BaZr1-x Y x O3-δ decreased from hundreds of microns to tens of microns with the increase of the Y2O3 content. Moreover, the zirconium content in the alloy decreased. Overall, the BaZr0.96Y0.04O3-δ ceramic crucible had a small thickness of the reaction layer and slight oxygen contamination in the alloys. This study offers new insights for the further development of Y2O3-doped BaZrO3 ceramics used in melting TiAl alloys.

Kanai, Toshimitsu; Fujisaki, Tomoyuki; Yokoyama, Yuka

doi: 10.1080/21870764.2025.2463161pmid: N/A

Supraparticles, which comprise assemblies of primary micro/nanoparticles, have attracted significant attention in various fields, including catalysis, biotechnology, energy production, and photonics. This study reports the continuous synthesis of monodisperse silica supraparticles by a two-stage microfluidic technique. First, the liquid materials (sodium silicate solution and silicone oil with a surfactant) are injected into a flow-focusing microfluidic device to generate monodisperse droplets of the sodium silicate solution in the oil phase. The droplet-containing oil phase is then transferred to a two-phase parallel-flow microfluidic device along with the simultaneous injection of ethanol. During the parallel flow of the oil phase and ethanol, ethanol diffuses to the sodium silicate solution droplets, wherein the dissolved sodium silicate undergoes a dehydration–condensation reaction with ethanol to generate monodisperse silica supraparticles. The developed method facilitates the continuous production of monodisperse silica supraparticles, which could expedite industrial and academic research on such systems.