ABSTRACT In this study, high-strength ceramic lightweight aggregates were prepared from oil-based drill cutting pyrolysis residues, and their formation mechanism and expansion during sintering were examined. It was found that the Al2O3 suppressed the melting process and increased the particle strength. In particular, Al atoms penetrated the liquid phase and formed a Si–Al–O crystal structure with four ligands, which reacted with CaO and BaO to produce aluminosilicate crystals, such as BaAl2Si2O8 and CaAl2Si2O8, which increased the compressive strength. Scanning electron microscope images revealed that the glass phase also contributed toward the high strength of ceramic materials by adhering to crystal grains and forming a concrete-like structure. Energy-dispersive X-ray spectroscopy data suggested that similar to Ca atoms, Ba atoms in pyrolysis residues played a critical role in the production of aluminosilicate, while transmission electron microscopy images confirmed that different phases were not well separated as Ba and Ca were stabilized in the same crystal grains. After SiC addition and increasing the sintering temperature, the product density significantly decreased while its porosity increased.
{"title":"Manufacturing of ceramic lightweight aggregates from oil-based drill cutting pyrolysis residues","authors":"Ziling Zhou, Li-ao Wang, Lei Wang, Xiang Wang, Quanwei Lv, Chuan Huang","doi":"10.1080/21870764.2022.2135283","DOIUrl":"https://doi.org/10.1080/21870764.2022.2135283","url":null,"abstract":"ABSTRACT In this study, high-strength ceramic lightweight aggregates were prepared from oil-based drill cutting pyrolysis residues, and their formation mechanism and expansion during sintering were examined. It was found that the Al2O3 suppressed the melting process and increased the particle strength. In particular, Al atoms penetrated the liquid phase and formed a Si–Al–O crystal structure with four ligands, which reacted with CaO and BaO to produce aluminosilicate crystals, such as BaAl2Si2O8 and CaAl2Si2O8, which increased the compressive strength. Scanning electron microscope images revealed that the glass phase also contributed toward the high strength of ceramic materials by adhering to crystal grains and forming a concrete-like structure. Energy-dispersive X-ray spectroscopy data suggested that similar to Ca atoms, Ba atoms in pyrolysis residues played a critical role in the production of aluminosilicate, while transmission electron microscopy images confirmed that different phases were not well separated as Ba and Ca were stabilized in the same crystal grains. After SiC addition and increasing the sintering temperature, the product density significantly decreased while its porosity increased.","PeriodicalId":15130,"journal":{"name":"Journal of Asian Ceramic Societies","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2022-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44778122","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-10-02DOI: 10.1080/21870764.2022.2129483
C. Jin, Jong-Chan Lim, Min Young Kim, Myung Sik Choi, Sang‐il Kim, S. Baek, Sun-Jae Kim, Seung Yong Lee, Hyun-Sik Kim, Kyu Hyoung Lee
ABSTRACT WO3 nanostructures with different morphologies and dimensions were fabricated via solvothermal synthesis by adjusting the stirring time of the precursor solution. Ethanol-based solutions of the WCl6 precursor with various colors (dark green, yellow, white, blue, and blue-black) were prepared, and this triggered a significant change in the growth behavior during the evolution of WO3 nanostructures. Controlling the initial state of the precursors in solution enabled sequential nucleation and growth which resulted in the production of zero-to-three-dimensional nanostructures including nanoparticles, a mixture of nanosheets and nanoparticles, jointed-nanosheets, and three-dimensionally clustered jointed-nanosheets. The crystallographic characteristics (preferred orientation along the (002) plane) and the concentration of surface oxygen vacancies were also controllable, suggesting the formation of nanostructures with tuneable surface reactivity. Differing NO2 sensing performances were observed because of the variation in configurations of the WO3 nanostructures.
{"title":"Impact of stirring time and the corresponding growth mechanism in the solvothermal synthesis of WO3 nanostructures","authors":"C. Jin, Jong-Chan Lim, Min Young Kim, Myung Sik Choi, Sang‐il Kim, S. Baek, Sun-Jae Kim, Seung Yong Lee, Hyun-Sik Kim, Kyu Hyoung Lee","doi":"10.1080/21870764.2022.2129483","DOIUrl":"https://doi.org/10.1080/21870764.2022.2129483","url":null,"abstract":"ABSTRACT WO3 nanostructures with different morphologies and dimensions were fabricated via solvothermal synthesis by adjusting the stirring time of the precursor solution. Ethanol-based solutions of the WCl6 precursor with various colors (dark green, yellow, white, blue, and blue-black) were prepared, and this triggered a significant change in the growth behavior during the evolution of WO3 nanostructures. Controlling the initial state of the precursors in solution enabled sequential nucleation and growth which resulted in the production of zero-to-three-dimensional nanostructures including nanoparticles, a mixture of nanosheets and nanoparticles, jointed-nanosheets, and three-dimensionally clustered jointed-nanosheets. The crystallographic characteristics (preferred orientation along the (002) plane) and the concentration of surface oxygen vacancies were also controllable, suggesting the formation of nanostructures with tuneable surface reactivity. Differing NO2 sensing performances were observed because of the variation in configurations of the WO3 nanostructures.","PeriodicalId":15130,"journal":{"name":"Journal of Asian Ceramic Societies","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2022-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43941324","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
ABSTRACT Zinc oxide nanoparticles (ZnO NPs) are concerned as potential materials due to their wide-ranging applications. The green synthesis of ZnO NPs using of plant extract as capping agent has been attracted much of interest of reserachers. Pineapple peel wastes are aboundance in Thailand and its extract contained high levels of phytochemical compounds (flavonoids and their derivatives). In this study, pineapple extract was used as a capping agent in ZnO NP synthesis, and KOH and a lye solution were used as reducing agents for comparison. The XRD patterns exhibit pure-phase ZnO with high crystallinity. The averages of the most petite crystalline sizes obtained from the Scherrer equation calculation of the prepared ZnO powder are 64.61 and 65.41 nm for KOH solution and lye use, respectively. Fourier transform infrared (FTIR) spectroscopy confirmed the presence of ZnO particles and pineapple extract residue in the as-received powder. Scanning electron microscope (SEM) images and transmission electron microscope (TEM) images showed the nano-size of the synthesized particles. The flower-like ZnO-NPs from a 0.06 M zinc precursor and KOH solution exhibited fascinating optical properties. Finally, all the results showed that lye from wood ash could be applied in ZnO nanoparticle synthesis using pineapple peel extract.
{"title":"Green synthesis of ZnO nanoparticles by pineapple peel extract from various alkali sources","authors":"A. Klinbumrung, Rattanaphorn Panya, Apinya Pung-Ngama, Pitak Nasomjai, Jumnong Saowalakmeka, Reungruthai Sirirak","doi":"10.1080/21870764.2022.2127504","DOIUrl":"https://doi.org/10.1080/21870764.2022.2127504","url":null,"abstract":"ABSTRACT Zinc oxide nanoparticles (ZnO NPs) are concerned as potential materials due to their wide-ranging applications. The green synthesis of ZnO NPs using of plant extract as capping agent has been attracted much of interest of reserachers. Pineapple peel wastes are aboundance in Thailand and its extract contained high levels of phytochemical compounds (flavonoids and their derivatives). In this study, pineapple extract was used as a capping agent in ZnO NP synthesis, and KOH and a lye solution were used as reducing agents for comparison. The XRD patterns exhibit pure-phase ZnO with high crystallinity. The averages of the most petite crystalline sizes obtained from the Scherrer equation calculation of the prepared ZnO powder are 64.61 and 65.41 nm for KOH solution and lye use, respectively. Fourier transform infrared (FTIR) spectroscopy confirmed the presence of ZnO particles and pineapple extract residue in the as-received powder. Scanning electron microscope (SEM) images and transmission electron microscope (TEM) images showed the nano-size of the synthesized particles. The flower-like ZnO-NPs from a 0.06 M zinc precursor and KOH solution exhibited fascinating optical properties. Finally, all the results showed that lye from wood ash could be applied in ZnO nanoparticle synthesis using pineapple peel extract.","PeriodicalId":15130,"journal":{"name":"Journal of Asian Ceramic Societies","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2022-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49511457","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-23DOI: 10.1080/21870764.2022.2114671
Seong Hyeok Choi, Yoon-Seok Lee, Hun Kwak, H. Jung, Min-Kee Kim, S. Cho, J. Yoon, JiYeoun. Choi, Min Seong Kim, Ji Hyeon Kim, I. Jo, Yangdo Kim, Moonhee Choi
ABSTRACT In this study, solid-state BaTiO3 was successfully synthesized after the disintegration of the starting materials (BaCO3 and TiO2) under various conditions. By analyzing the microstructure, tetragonality, crystallinity, and particle size distribution of the synthesized powder, the factors that affected the properties of the BaTiO3 solid-state synthetic powder were successfully identified. Furthermore, the changes in the dielectric constants (temperature characteristic coefficients) of the sintered specimens were investigated using each powder, according to the dielectric characteristics, high-temperature resistance, and temperature, to identify the direct and indirect relationships between the disintegration conditions, synthetic powders, and sintered specimens. Finally, optimal conditions for the uniform solid-state synthesis of BaTiO3 powder for multilayer ceramic capacitor production were derived.
{"title":"Major factors affecting the dielectric properties and reliability of solid stated reacted BaTiO3 powders for capacitor","authors":"Seong Hyeok Choi, Yoon-Seok Lee, Hun Kwak, H. Jung, Min-Kee Kim, S. Cho, J. Yoon, JiYeoun. Choi, Min Seong Kim, Ji Hyeon Kim, I. Jo, Yangdo Kim, Moonhee Choi","doi":"10.1080/21870764.2022.2114671","DOIUrl":"https://doi.org/10.1080/21870764.2022.2114671","url":null,"abstract":"ABSTRACT In this study, solid-state BaTiO3 was successfully synthesized after the disintegration of the starting materials (BaCO3 and TiO2) under various conditions. By analyzing the microstructure, tetragonality, crystallinity, and particle size distribution of the synthesized powder, the factors that affected the properties of the BaTiO3 solid-state synthetic powder were successfully identified. Furthermore, the changes in the dielectric constants (temperature characteristic coefficients) of the sintered specimens were investigated using each powder, according to the dielectric characteristics, high-temperature resistance, and temperature, to identify the direct and indirect relationships between the disintegration conditions, synthetic powders, and sintered specimens. Finally, optimal conditions for the uniform solid-state synthesis of BaTiO3 powder for multilayer ceramic capacitor production were derived.","PeriodicalId":15130,"journal":{"name":"Journal of Asian Ceramic Societies","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2022-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42499066","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-23DOI: 10.1080/21870764.2022.2127262
S. Lee, Y. Sugimoto, Katsuya Kato, T. Miyajima, M. Sakurai, F. Nagata
ABSTRACT Beta-carotene (BC) is a nutrient in vegetables and a precursor of vitamin A. BC has been reported to have anticarcinogenic, antiaging, and antioxidation properties and prevents heart diseases. Recently, BC has gained significant attention due to stimulating effect on osteoblast differentiation. Poly(lactic acid)/hydroxyapatite (PLA/HAp) core-shell nanoparticles have been reported earlier with a load capacity of 250% for water-insoluble substances, using a surfactant-free emulsification method. In this work, PLA/HAp core-shell nanoparticles loaded with BC were prepared, and osteoblast differentiation behavior was evaluated. BC was successfully loaded into PLA/HAp core-shell nanoparticles with diameters of approximately 30 nm. BC/loaded PLA/HAp core-shell nanoparticles stimulated osteoblast differentiation by upregulating collagen type I, osteopontin, and osteocalcin expression. In addition, the gene expression levels of these osteoblasts were significantly larger than those stimulated by PLA/HAp core-shell nanoparticles without BC and cultured in a differential medium (with ascorbic acid and β-glycerophosphate). PLA/HAp core-shell nanoparticles showed satisfactory cytocompatibility because they were attached to the osteoblasts. Consequently, BC was effectively delivered to osteoblasts by nanoparticles. These results suggested that BC-loaded PLA/HAp core-shell nanoparticles could enhance bone formation. Graphical Abstract
{"title":"Development of beta-carotene-loaded poly(lactic acid)/hydroxyapatite core-shell nanoparticles for osteoblast differentiation","authors":"S. Lee, Y. Sugimoto, Katsuya Kato, T. Miyajima, M. Sakurai, F. Nagata","doi":"10.1080/21870764.2022.2127262","DOIUrl":"https://doi.org/10.1080/21870764.2022.2127262","url":null,"abstract":"ABSTRACT Beta-carotene (BC) is a nutrient in vegetables and a precursor of vitamin A. BC has been reported to have anticarcinogenic, antiaging, and antioxidation properties and prevents heart diseases. Recently, BC has gained significant attention due to stimulating effect on osteoblast differentiation. Poly(lactic acid)/hydroxyapatite (PLA/HAp) core-shell nanoparticles have been reported earlier with a load capacity of 250% for water-insoluble substances, using a surfactant-free emulsification method. In this work, PLA/HAp core-shell nanoparticles loaded with BC were prepared, and osteoblast differentiation behavior was evaluated. BC was successfully loaded into PLA/HAp core-shell nanoparticles with diameters of approximately 30 nm. BC/loaded PLA/HAp core-shell nanoparticles stimulated osteoblast differentiation by upregulating collagen type I, osteopontin, and osteocalcin expression. In addition, the gene expression levels of these osteoblasts were significantly larger than those stimulated by PLA/HAp core-shell nanoparticles without BC and cultured in a differential medium (with ascorbic acid and β-glycerophosphate). PLA/HAp core-shell nanoparticles showed satisfactory cytocompatibility because they were attached to the osteoblasts. Consequently, BC was effectively delivered to osteoblasts by nanoparticles. These results suggested that BC-loaded PLA/HAp core-shell nanoparticles could enhance bone formation. Graphical Abstract","PeriodicalId":15130,"journal":{"name":"Journal of Asian Ceramic Societies","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2022-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45208438","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-21DOI: 10.1080/21870764.2022.2114145
Zhenying Liu, N. Xie, Hanxin Zhang, Shouwu Huang, Chongmei Wu, Shuhuan He, Jinbo Zhu, Yin Liu
ABSTRACT Mullite composite ceramics were fabricated by using mullite powder from waste coal gangue and Al(OH)3 as starting materials. The effects of sintering temperature and Al(OH)3 content on phase composition, microstructure, and mechanical properties of the ceramics were systematically investigated. Results show that the bulk density and flexural strength of composite ceramics increase as the temperature increases from 1480°C to 1560°C. The composite ceramics exhibit optimal performances with addition of 10 wt.% Al(OH)3 at 1560°C, a bulk density of 2.43 g/cm3 and a flexural strength of 124.28 MPa, respectively. Moreover, additional Al(OH)3 promotes a reaction between SiO2 and Al2O3 and forms more mullite phase. The increase in mullite content endows the composite ceramics with high mechanical properties. Scanning electron microscope images indicate that the mullite particles exhibit an interlocking structure, while the corundum phase is “pinned” within the mullite interlocking structure, contributing to the mechanical properties of composite ceramics.
{"title":"Effect of Al(OH)3 addition on densification mechanism and properties of reaction-sintered mullite-corundum composite ceramics","authors":"Zhenying Liu, N. Xie, Hanxin Zhang, Shouwu Huang, Chongmei Wu, Shuhuan He, Jinbo Zhu, Yin Liu","doi":"10.1080/21870764.2022.2114145","DOIUrl":"https://doi.org/10.1080/21870764.2022.2114145","url":null,"abstract":"ABSTRACT Mullite composite ceramics were fabricated by using mullite powder from waste coal gangue and Al(OH)3 as starting materials. The effects of sintering temperature and Al(OH)3 content on phase composition, microstructure, and mechanical properties of the ceramics were systematically investigated. Results show that the bulk density and flexural strength of composite ceramics increase as the temperature increases from 1480°C to 1560°C. The composite ceramics exhibit optimal performances with addition of 10 wt.% Al(OH)3 at 1560°C, a bulk density of 2.43 g/cm3 and a flexural strength of 124.28 MPa, respectively. Moreover, additional Al(OH)3 promotes a reaction between SiO2 and Al2O3 and forms more mullite phase. The increase in mullite content endows the composite ceramics with high mechanical properties. Scanning electron microscope images indicate that the mullite particles exhibit an interlocking structure, while the corundum phase is “pinned” within the mullite interlocking structure, contributing to the mechanical properties of composite ceramics.","PeriodicalId":15130,"journal":{"name":"Journal of Asian Ceramic Societies","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2022-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43656685","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
ABSTRACT This paper reveals the high-voltage insulation properties – namely the dielectric constant, dissipation factor, breakdown strength, and voltage – of epoxy resin samples of various thicknesses containing the microadditives albite, potassium feldspar, lithium glass, and zinc glass in different concentrations. 0.1 wt% KAlSi3O8 ceramic powders as fillers in 1 mm epoxy composites designed for insulation is taken as the choice for highest breakdown strength 36.6491 kV/mm. After that, 5 wt% Li-Bi-B-O glass at 35.4687 kV/mm, 10 wt% Zn-Bi-B-O glass at 35.0432 kV/mm, and 10 wt% NaAlSi3O8 at 33.6504 kV/mm. The increase of thickness more than 1 mm is not recommended in the practical application due to the decrease of breakdown strength. Multi-layer thin structure is recommended for insulation purpose.
{"title":"High-voltage insulation and dielectric properties of ceramic-glass composites","authors":"Ming-Yueh Hsieh, Wen-Shiush Chen, Cheng-Hsing Hsu, Cheng-Hsuan Wu","doi":"10.1080/21870764.2022.2123522","DOIUrl":"https://doi.org/10.1080/21870764.2022.2123522","url":null,"abstract":"ABSTRACT This paper reveals the high-voltage insulation properties – namely the dielectric constant, dissipation factor, breakdown strength, and voltage – of epoxy resin samples of various thicknesses containing the microadditives albite, potassium feldspar, lithium glass, and zinc glass in different concentrations. 0.1 wt% KAlSi3O8 ceramic powders as fillers in 1 mm epoxy composites designed for insulation is taken as the choice for highest breakdown strength 36.6491 kV/mm. After that, 5 wt% Li-Bi-B-O glass at 35.4687 kV/mm, 10 wt% Zn-Bi-B-O glass at 35.0432 kV/mm, and 10 wt% NaAlSi3O8 at 33.6504 kV/mm. The increase of thickness more than 1 mm is not recommended in the practical application due to the decrease of breakdown strength. Multi-layer thin structure is recommended for insulation purpose.","PeriodicalId":15130,"journal":{"name":"Journal of Asian Ceramic Societies","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2022-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47075230","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-16DOI: 10.1080/21870764.2022.2123514
M. Kamitakahara, Kanau Asahara, H. Matsubara
ABSTRACT Calcium phosphate cements (CPCs) are used as artificial bone materials. The bone regeneration ability of CPCs can be improved by controlling their composition, porosity, and pore size. This study aims to design novel CPCs with high bone regeneration ability by controlling their microstructure. CPCs with macropores and micropores were prepared by incorporating spherical porous calcium phosphate granules composed of rod-shaped, calcium-deficient hydroxyapatite (CDHA) or plate-shaped octacalcium phosphate (OCP) particles. The granules were mixed with a binder (cement powder) composed primarily of α-tricalcium phosphate. The structure, morphology, compressive strength, porosity, specific surface area, pore size distribution, dissolution characteristics, and effects on cell viabilities were studied for the synthesized samples. The CPCs composed of porous granules had high porosity (~80%) and both macropores and micropores, which are expected to contribute to bone regeneration. The CPCs composed of porous granules showed a smaller specific surface area but a larger dissolution rate than the granule-free samples. The CPC composed of OCP granules showed a higher dissolution rate than the CPCs containing CDHA granules. In the cell culture experiments, the preosteoblasts proliferated on the CPCs, indicating that these CPCs could function as scaffolds for bone regeneration. Graphical Abstract
{"title":"Calcium phosphate cements comprising spherical porous calcium phosphate granules: synthesis, structure, and properties","authors":"M. Kamitakahara, Kanau Asahara, H. Matsubara","doi":"10.1080/21870764.2022.2123514","DOIUrl":"https://doi.org/10.1080/21870764.2022.2123514","url":null,"abstract":"ABSTRACT Calcium phosphate cements (CPCs) are used as artificial bone materials. The bone regeneration ability of CPCs can be improved by controlling their composition, porosity, and pore size. This study aims to design novel CPCs with high bone regeneration ability by controlling their microstructure. CPCs with macropores and micropores were prepared by incorporating spherical porous calcium phosphate granules composed of rod-shaped, calcium-deficient hydroxyapatite (CDHA) or plate-shaped octacalcium phosphate (OCP) particles. The granules were mixed with a binder (cement powder) composed primarily of α-tricalcium phosphate. The structure, morphology, compressive strength, porosity, specific surface area, pore size distribution, dissolution characteristics, and effects on cell viabilities were studied for the synthesized samples. The CPCs composed of porous granules had high porosity (~80%) and both macropores and micropores, which are expected to contribute to bone regeneration. The CPCs composed of porous granules showed a smaller specific surface area but a larger dissolution rate than the granule-free samples. The CPC composed of OCP granules showed a higher dissolution rate than the CPCs containing CDHA granules. In the cell culture experiments, the preosteoblasts proliferated on the CPCs, indicating that these CPCs could function as scaffolds for bone regeneration. Graphical Abstract","PeriodicalId":15130,"journal":{"name":"Journal of Asian Ceramic Societies","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2022-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45905396","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-05DOI: 10.1080/21870764.2022.2117892
Chang-Hwan Oh, R. S. Babu, Seung-il Kim, Dong-Park Lee, Gyuhyeon Sim, Do-Hyeon Lee, Yeonjin Je, Kim Chan Hwi, W. Jeong, G. Ryu, Jun Young Kim, S. Nam, Jae Hyun Lee, Jun‐Hong Park
ABSTRACT A tremendous effort has been made to develop 2D materials-based FETs for electronic applications due to their atomically thin structures. Typically, the electrical performance of the device can vary with the surface roughness and thickness of the channel layer. Therefore, a two-step surface engineering process is demonstrated to tailor the surface roughness and thickness of MoSe2 multilayers involving exposure of O2 plasma followed by dipping in (NH4)2S(aq) solution. The O2 plasma treatment generated an amorphous MoOx layer to form a MoOx/MoSe2 heterojunction, and the (NH4)2S(aq) treatment tailored the surface roughness of the heterojunction. The ON/OFF current ratio of MoSe2 FET is about 1.1 × 105 and 5.7 × 104 for bare and chemically etched MoSe2, respectively. The surface roughness of the chemically treated MoSe2 is higher than that of the bare, 4.2 ± 0.5 nm against 3.6 ± 0.5 nm. Conversely, a 1-hour exposure of the multilayer MoOx/MoSe2 heterostructure with the (NH4)2S(aq) solution removed the amorphous oxide layer and scaled down the thickness of MoSe2 from ~92.2 nm to ~38.9 nm. The preliminary study shows that this simple two-step strategy can obtain a higher surface-area-to-volume ratio and thickness engineering with acceptable variation in electrical properties.
{"title":"Surface morphology engineering of metal oxide-transition metal dichalcogenide heterojunction","authors":"Chang-Hwan Oh, R. S. Babu, Seung-il Kim, Dong-Park Lee, Gyuhyeon Sim, Do-Hyeon Lee, Yeonjin Je, Kim Chan Hwi, W. Jeong, G. Ryu, Jun Young Kim, S. Nam, Jae Hyun Lee, Jun‐Hong Park","doi":"10.1080/21870764.2022.2117892","DOIUrl":"https://doi.org/10.1080/21870764.2022.2117892","url":null,"abstract":"ABSTRACT A tremendous effort has been made to develop 2D materials-based FETs for electronic applications due to their atomically thin structures. Typically, the electrical performance of the device can vary with the surface roughness and thickness of the channel layer. Therefore, a two-step surface engineering process is demonstrated to tailor the surface roughness and thickness of MoSe2 multilayers involving exposure of O2 plasma followed by dipping in (NH4)2S(aq) solution. The O2 plasma treatment generated an amorphous MoOx layer to form a MoOx/MoSe2 heterojunction, and the (NH4)2S(aq) treatment tailored the surface roughness of the heterojunction. The ON/OFF current ratio of MoSe2 FET is about 1.1 × 105 and 5.7 × 104 for bare and chemically etched MoSe2, respectively. The surface roughness of the chemically treated MoSe2 is higher than that of the bare, 4.2 ± 0.5 nm against 3.6 ± 0.5 nm. Conversely, a 1-hour exposure of the multilayer MoOx/MoSe2 heterostructure with the (NH4)2S(aq) solution removed the amorphous oxide layer and scaled down the thickness of MoSe2 from ~92.2 nm to ~38.9 nm. The preliminary study shows that this simple two-step strategy can obtain a higher surface-area-to-volume ratio and thickness engineering with acceptable variation in electrical properties.","PeriodicalId":15130,"journal":{"name":"Journal of Asian Ceramic Societies","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2022-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49323896","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-08-22DOI: 10.1080/21870764.2022.2113963
Kim Kyusung, Chunyan Li, P. Choi, T. Itoh, Y. Masuda
ABSTRACT Control of nanomaterial morphology has been investigated to utilize for the desired application. 1D nanomaterials are ideal for various applications because of their excellent carrier transportability and huge specific surface area. Due to their advantages, various methods have been developed to grow in a specific direction. Herein, we introduced a simple synthesis method of freestanding Zinc hydroxidefluoride (ZnOHF) nanobelt as 1D material without seed or substrate using aqueous solutions. The ZnOHF nanobelt was synthesized using zinc fluoride and hexamethylenetetramine (HMT) at 80°C for 3 h. Even though low synthesis temperature, ZnOHF demonstrated good crystallinity and a homogeneous nanobelt structure. The ZnOHF nanobelts were grown over several μm to <010> direction with less than 100 nm width. In addition, the growth direction of the nanobelt was controlled by the concentration of HMT. The width of the nanobelt was broader by a decrease in HMT concentration. It was considered that crystal nucleation and growth of ZnOHF could be influenced by OH− and NH4 + ions generated from HMT decomposition. GRAPHICAL ABSTRACT
{"title":"Facile synthesis of zinc hydroxyfluoride nanobelt and effect of hexamethylenetetramine for growth direction","authors":"Kim Kyusung, Chunyan Li, P. Choi, T. Itoh, Y. Masuda","doi":"10.1080/21870764.2022.2113963","DOIUrl":"https://doi.org/10.1080/21870764.2022.2113963","url":null,"abstract":"ABSTRACT Control of nanomaterial morphology has been investigated to utilize for the desired application. 1D nanomaterials are ideal for various applications because of their excellent carrier transportability and huge specific surface area. Due to their advantages, various methods have been developed to grow in a specific direction. Herein, we introduced a simple synthesis method of freestanding Zinc hydroxidefluoride (ZnOHF) nanobelt as 1D material without seed or substrate using aqueous solutions. The ZnOHF nanobelt was synthesized using zinc fluoride and hexamethylenetetramine (HMT) at 80°C for 3 h. Even though low synthesis temperature, ZnOHF demonstrated good crystallinity and a homogeneous nanobelt structure. The ZnOHF nanobelts were grown over several μm to <010> direction with less than 100 nm width. In addition, the growth direction of the nanobelt was controlled by the concentration of HMT. The width of the nanobelt was broader by a decrease in HMT concentration. It was considered that crystal nucleation and growth of ZnOHF could be influenced by OH− and NH4 + ions generated from HMT decomposition. GRAPHICAL ABSTRACT","PeriodicalId":15130,"journal":{"name":"Journal of Asian Ceramic Societies","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2022-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47059904","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：