The Experts below are selected from a list of 306 Experts worldwide ranked by ideXlab platform
T Arun - One of the best experts on this subject based on the ideXlab platform.
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formation of Hexagonal Plate shaped zno microparticles a study on antibacterial and magnetic properties
Ceramics International, 2016Co-Authors: N Mala, K Ravichandran, S Pandiarajan, N Srinivasan, B Ravikumar, Catherine Siriya K Pushpa, K Swaminathan, T ArunAbstract:Abstract The focus of this work is to realize ZnO microparticles with simultaneously enhanced antibacterial and magnetic properties through a double cationic (Mg+Co) doping. Undoped and magnesium (Mg)+ cobalt (Co) doped ZnO microparticles were synthesized using a cost-effective simple soft chemical route. Their surface morphological, magnetic, antibacterial and structural properties were investigated. Antibacterial studies of the prepared samples were carried out against a Gram Positive and Gram Negative bacteria. From the antibacterial studies, it is found that the double cationic doped ZnO microparticles exhibit superior antibacterial efficiency compared with undoped and single cationic doped ZnO microparticles. The FESEM images show that the undoped and single cationic (Mg/Co) doped ZnO particles have Hexagonal block structures of micro scale dimensions whereas the double cationic doping causes the formation of Hexagonal Plate structures having near nanoscale thickness (~150 nm), thereby increasing the effective reactive surface area. The magnetization curves show that the coexistence of Mg 2+ and Co 2+ ions in the ZnO lattice causes a pronounced increase in the ferromagnetic behavior, already present in the undoped and single cationic doped ZnO material. The XRD, FTIR and PL results support the discussion on the antibacterial and magnetic results. The EDAX profiles and the compositional mapping images confirm the presence of expected proportions of the constituent elements and their uniform distribution in the final product. Structural studies show that the products exhibit Hexagonal wurtzite structure of ZnO without any secondary phases.
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Formation of Hexagonal Plate shaped ZnO microparticles – A study on antibacterial and magnetic properties
Ceramics International, 2016Co-Authors: N Mala, K Ravichandran, S Pandiarajan, N Srinivasan, B Ravikumar, K Swaminathan, K. Catherine Siriya Pushpa, T ArunAbstract:Abstract The focus of this work is to realize ZnO microparticles with simultaneously enhanced antibacterial and magnetic properties through a double cationic (Mg+Co) doping. Undoped and magnesium (Mg)+ cobalt (Co) doped ZnO microparticles were synthesized using a cost-effective simple soft chemical route. Their surface morphological, magnetic, antibacterial and structural properties were investigated. Antibacterial studies of the prepared samples were carried out against a Gram Positive and Gram Negative bacteria. From the antibacterial studies, it is found that the double cationic doped ZnO microparticles exhibit superior antibacterial efficiency compared with undoped and single cationic doped ZnO microparticles. The FESEM images show that the undoped and single cationic (Mg/Co) doped ZnO particles have Hexagonal block structures of micro scale dimensions whereas the double cationic doping causes the formation of Hexagonal Plate structures having near nanoscale thickness (~150 nm), thereby increasing the effective reactive surface area. The magnetization curves show that the coexistence of Mg 2+ and Co 2+ ions in the ZnO lattice causes a pronounced increase in the ferromagnetic behavior, already present in the undoped and single cationic doped ZnO material. The XRD, FTIR and PL results support the discussion on the antibacterial and magnetic results. The EDAX profiles and the compositional mapping images confirm the presence of expected proportions of the constituent elements and their uniform distribution in the final product. Structural studies show that the products exhibit Hexagonal wurtzite structure of ZnO without any secondary phases.
Hidehiko Tanaka - One of the best experts on this subject based on the ideXlab platform.
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Hexagonal Plate like ternary carbide particulates synthesized by a carbothermal reduction process processing parameters and synthesis mechanism
Journal of the American Ceramic Society, 2009Co-Authors: Toshiyuki Nishimura, Hidehiko TanakaAbstract:Aluminum-containing ternary carbide, Al4SiC4, was successfully synthesized using a mixture of Al(OH)3, SiO2, and phenolic resin by a carbothermal reduction process without any posttreatment. In addition, the processing parameters were optimized in this study. Unlike the JCPDS pattern of Al4SiC4, the powder has a highly aligned structure along the c-axis, indicating a Hexagonal Plate-like morphology. The growth rate of particulates was higher than the nucleation rate as the carbon content decreased. The crystallinity (formation yield) of Al4SiC4 was much more dependent on the ratio of carbon to oxides than on the ratio of SiO2 to Al(OH)3. Possible reaction mechanisms responsible for the synthesis of ternary carbide are discussed by considering reactions at the initial and later stages during the carbothermal reduction process.
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Hexagonal Plate‐like Ternary Carbide Particulates Synthesized by a Carbothermal Reduction Process: Processing Parameters and Synthesis Mechanism
Journal of the American Ceramic Society, 2009Co-Authors: Toshiyuki Nishimura, Hidehiko TanakaAbstract:Aluminum-containing ternary carbide, Al4SiC4, was successfully synthesized using a mixture of Al(OH)3, SiO2, and phenolic resin by a carbothermal reduction process without any posttreatment. In addition, the processing parameters were optimized in this study. Unlike the JCPDS pattern of Al4SiC4, the powder has a highly aligned structure along the c-axis, indicating a Hexagonal Plate-like morphology. The growth rate of particulates was higher than the nucleation rate as the carbon content decreased. The crystallinity (formation yield) of Al4SiC4 was much more dependent on the ratio of carbon to oxides than on the ratio of SiO2 to Al(OH)3. Possible reaction mechanisms responsible for the synthesis of ternary carbide are discussed by considering reactions at the initial and later stages during the carbothermal reduction process.
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synthesis of single phase Hexagonal Plate like al4sic4 powder
Key Engineering Materials, 2008Co-Authors: Toshiyuki Nishimura, Hidehiko TanakaAbstract:Single-phase and Hexagonal Plate-like Al4SiC4 powder was successfully synthesized using a mixture of Al(OH)3, SiO2 and carbon via a carbothermal reduction process. Two-step reaction was compartmentally observed during the calcination; the carbothermal reduction of SiO2 between 1300 and 1600oC and that of Al2O3 above 1500oC. The mechanisms which were responsible for the synthesis of the ternary carbide (Al4SiC4) powder were discussed.
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synthesis of mono phase Hexagonal Plate like al4sic4 powder via a carbothermal reduction process
Journal of the Ceramic Society of Japan, 2008Co-Authors: Toshiyuki Nishimura, Hidehiko TanakaAbstract:Mono-phase and Hexagonal Plate-like Al 4 SiC 4 powders were successfully synthesized using a mixture of Al(OH) 3 , SiO 2 and phenolic resin via the carbothermal reduction process. Two-step reaction was compartmentally observed during calcination; the carbothermal reduction of SiO 2 between 1300 and 1600°C and that of Al 2 O 3 above 1500°C. X-ray diffraction data indicated the orientation of the compacted powders along c-axis due to the stacking of Plate-like Al 4 SiC 4 powders. Microscopic observation showed that the synthesized powders were mainly Hexagonal Platelets. The main synthetic mechanism of the ternary carbide powder during the carbothermal reduction process was gas-solid reaction. Possible reaction mechanisms which are responsible for the synthesis of Al 4 SiC 4 by the carbothermal reduction process are discussed.
N Mala - One of the best experts on this subject based on the ideXlab platform.
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formation of Hexagonal Plate shaped zno microparticles a study on antibacterial and magnetic properties
Ceramics International, 2016Co-Authors: N Mala, K Ravichandran, S Pandiarajan, N Srinivasan, B Ravikumar, Catherine Siriya K Pushpa, K Swaminathan, T ArunAbstract:Abstract The focus of this work is to realize ZnO microparticles with simultaneously enhanced antibacterial and magnetic properties through a double cationic (Mg+Co) doping. Undoped and magnesium (Mg)+ cobalt (Co) doped ZnO microparticles were synthesized using a cost-effective simple soft chemical route. Their surface morphological, magnetic, antibacterial and structural properties were investigated. Antibacterial studies of the prepared samples were carried out against a Gram Positive and Gram Negative bacteria. From the antibacterial studies, it is found that the double cationic doped ZnO microparticles exhibit superior antibacterial efficiency compared with undoped and single cationic doped ZnO microparticles. The FESEM images show that the undoped and single cationic (Mg/Co) doped ZnO particles have Hexagonal block structures of micro scale dimensions whereas the double cationic doping causes the formation of Hexagonal Plate structures having near nanoscale thickness (~150 nm), thereby increasing the effective reactive surface area. The magnetization curves show that the coexistence of Mg 2+ and Co 2+ ions in the ZnO lattice causes a pronounced increase in the ferromagnetic behavior, already present in the undoped and single cationic doped ZnO material. The XRD, FTIR and PL results support the discussion on the antibacterial and magnetic results. The EDAX profiles and the compositional mapping images confirm the presence of expected proportions of the constituent elements and their uniform distribution in the final product. Structural studies show that the products exhibit Hexagonal wurtzite structure of ZnO without any secondary phases.
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Formation of Hexagonal Plate shaped ZnO microparticles – A study on antibacterial and magnetic properties
Ceramics International, 2016Co-Authors: N Mala, K Ravichandran, S Pandiarajan, N Srinivasan, B Ravikumar, K Swaminathan, K. Catherine Siriya Pushpa, T ArunAbstract:Abstract The focus of this work is to realize ZnO microparticles with simultaneously enhanced antibacterial and magnetic properties through a double cationic (Mg+Co) doping. Undoped and magnesium (Mg)+ cobalt (Co) doped ZnO microparticles were synthesized using a cost-effective simple soft chemical route. Their surface morphological, magnetic, antibacterial and structural properties were investigated. Antibacterial studies of the prepared samples were carried out against a Gram Positive and Gram Negative bacteria. From the antibacterial studies, it is found that the double cationic doped ZnO microparticles exhibit superior antibacterial efficiency compared with undoped and single cationic doped ZnO microparticles. The FESEM images show that the undoped and single cationic (Mg/Co) doped ZnO particles have Hexagonal block structures of micro scale dimensions whereas the double cationic doping causes the formation of Hexagonal Plate structures having near nanoscale thickness (~150 nm), thereby increasing the effective reactive surface area. The magnetization curves show that the coexistence of Mg 2+ and Co 2+ ions in the ZnO lattice causes a pronounced increase in the ferromagnetic behavior, already present in the undoped and single cationic doped ZnO material. The XRD, FTIR and PL results support the discussion on the antibacterial and magnetic results. The EDAX profiles and the compositional mapping images confirm the presence of expected proportions of the constituent elements and their uniform distribution in the final product. Structural studies show that the products exhibit Hexagonal wurtzite structure of ZnO without any secondary phases.
Toshiyuki Nishimura - One of the best experts on this subject based on the ideXlab platform.
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Hexagonal Plate like ternary carbide particulates synthesized by a carbothermal reduction process processing parameters and synthesis mechanism
Journal of the American Ceramic Society, 2009Co-Authors: Toshiyuki Nishimura, Hidehiko TanakaAbstract:Aluminum-containing ternary carbide, Al4SiC4, was successfully synthesized using a mixture of Al(OH)3, SiO2, and phenolic resin by a carbothermal reduction process without any posttreatment. In addition, the processing parameters were optimized in this study. Unlike the JCPDS pattern of Al4SiC4, the powder has a highly aligned structure along the c-axis, indicating a Hexagonal Plate-like morphology. The growth rate of particulates was higher than the nucleation rate as the carbon content decreased. The crystallinity (formation yield) of Al4SiC4 was much more dependent on the ratio of carbon to oxides than on the ratio of SiO2 to Al(OH)3. Possible reaction mechanisms responsible for the synthesis of ternary carbide are discussed by considering reactions at the initial and later stages during the carbothermal reduction process.
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Hexagonal Plate‐like Ternary Carbide Particulates Synthesized by a Carbothermal Reduction Process: Processing Parameters and Synthesis Mechanism
Journal of the American Ceramic Society, 2009Co-Authors: Toshiyuki Nishimura, Hidehiko TanakaAbstract:Aluminum-containing ternary carbide, Al4SiC4, was successfully synthesized using a mixture of Al(OH)3, SiO2, and phenolic resin by a carbothermal reduction process without any posttreatment. In addition, the processing parameters were optimized in this study. Unlike the JCPDS pattern of Al4SiC4, the powder has a highly aligned structure along the c-axis, indicating a Hexagonal Plate-like morphology. The growth rate of particulates was higher than the nucleation rate as the carbon content decreased. The crystallinity (formation yield) of Al4SiC4 was much more dependent on the ratio of carbon to oxides than on the ratio of SiO2 to Al(OH)3. Possible reaction mechanisms responsible for the synthesis of ternary carbide are discussed by considering reactions at the initial and later stages during the carbothermal reduction process.
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synthesis of single phase Hexagonal Plate like al4sic4 powder
Key Engineering Materials, 2008Co-Authors: Toshiyuki Nishimura, Hidehiko TanakaAbstract:Single-phase and Hexagonal Plate-like Al4SiC4 powder was successfully synthesized using a mixture of Al(OH)3, SiO2 and carbon via a carbothermal reduction process. Two-step reaction was compartmentally observed during the calcination; the carbothermal reduction of SiO2 between 1300 and 1600oC and that of Al2O3 above 1500oC. The mechanisms which were responsible for the synthesis of the ternary carbide (Al4SiC4) powder were discussed.
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synthesis of mono phase Hexagonal Plate like al4sic4 powder via a carbothermal reduction process
Journal of the Ceramic Society of Japan, 2008Co-Authors: Toshiyuki Nishimura, Hidehiko TanakaAbstract:Mono-phase and Hexagonal Plate-like Al 4 SiC 4 powders were successfully synthesized using a mixture of Al(OH) 3 , SiO 2 and phenolic resin via the carbothermal reduction process. Two-step reaction was compartmentally observed during calcination; the carbothermal reduction of SiO 2 between 1300 and 1600°C and that of Al 2 O 3 above 1500°C. X-ray diffraction data indicated the orientation of the compacted powders along c-axis due to the stacking of Plate-like Al 4 SiC 4 powders. Microscopic observation showed that the synthesized powders were mainly Hexagonal Platelets. The main synthetic mechanism of the ternary carbide powder during the carbothermal reduction process was gas-solid reaction. Possible reaction mechanisms which are responsible for the synthesis of Al 4 SiC 4 by the carbothermal reduction process are discussed.
Chao Yu - One of the best experts on this subject based on the ideXlab platform.
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synthesis of Hexagonal Plate like al4si2c5 and the effect of al4si2c5 addition to al2o3 c refractory
Advanced Powder Technology, 2017Co-Authors: Chao Yu, Chengji Deng, Jun Ding, Shimin ZhouAbstract:Abstract Hexagonal Plate-like Al 4 Si 2 C 5 particles were synthesized for the first time via a carbothermal reduction process with controlled heating temperature and raw materials ratio, and their oxidation behavior was investigated. Al 4 O 4 C, Al 2 OC, SiC and Al 4 SiC 4 formed as intermediate products when the batch mixture was heated in argon atmosphere, and Al 4 Si 2 C 5 then formed at above 1800 °C. Possible reaction mechanisms responsible for the formation of this ternary carbide were discussed based on the reactions at the initial and later stages of the carbothermal reduction process. Al 4 Si 2 C 5 added to the Al 2 O 3 –C refractory initially reacts with CO to form Al 2 O 3 , SiO 2 and C. After the reaction, Al 2 O 3 react with SiO 2 to form mullite on the surfaces of the refractories, which inhibit the oxidation of the refractories.
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Synthesis of Hexagonal Plate-like Al4Si2C5 and the effect of Al4Si2C5 addition to Al2O3–C refractory
Advanced Powder Technology, 2016Co-Authors: Chao Yu, Chengji Deng, Jun Ding, Shimin ZhouAbstract:Abstract Hexagonal Plate-like Al 4 Si 2 C 5 particles were synthesized for the first time via a carbothermal reduction process with controlled heating temperature and raw materials ratio, and their oxidation behavior was investigated. Al 4 O 4 C, Al 2 OC, SiC and Al 4 SiC 4 formed as intermediate products when the batch mixture was heated in argon atmosphere, and Al 4 Si 2 C 5 then formed at above 1800 °C. Possible reaction mechanisms responsible for the formation of this ternary carbide were discussed based on the reactions at the initial and later stages of the carbothermal reduction process. Al 4 Si 2 C 5 added to the Al 2 O 3 –C refractory initially reacts with CO to form Al 2 O 3 , SiO 2 and C. After the reaction, Al 2 O 3 react with SiO 2 to form mullite on the surfaces of the refractories, which inhibit the oxidation of the refractories.
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ni catalyzed synthesis of Hexagonal Plate like alpha silicon nitride from nitridation of si powder in molten salt media
Advanced Powder Technology, 2016Co-Authors: Zhinan Chai, Jun Ding, Chengji Deng, Guangqiang Li, Chao YuAbstract:Abstract The catalytic effects of Ni during the nitridation of Si from a molten salt and the morphologies of the nitridation products were investigated. The phase composition, particle size, and morphological structure of the α-Si 3 N 4 powder were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and a Brunauer–Emmett–Teller (BET) specific-surface-area analysis. The results showed that Ni significantly accelerated Si nitridation and the formation of the Hexagonal Plate-like α-Si 3 N 4 phase by the formation of Ni–Si in the eutectic salt at 1050–1350 °C. Further, the nitridation rate of the Si powder was increased to 93% after 5 h at 1250 °C with 2-wt% Ni used as the catalyst. The specific surface area of the α-Si 3 N 4 synthesized powder was 5.70–10 m 2 /g, exceeding that of 1.70 m 2 /g of the Si powder.
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synthesis of Hexagonal Plate like al4sic4 from calcined bauxite silica and carbon black
Powder Technology, 2013Co-Authors: Chao Yu, Wenjie Yuan, Chengji Deng, Jun LiAbstract:Abstract Aluminum silicon carbide (Al4SiC4) ceramic powder was synthesized using a mixture of calcined bauxite, silica and carbon black powders via a carbothermal reduction process. The effects of synthesis temperature and raw materials ratio on the formation process and morphology of Al4SiC4 were investigated. The results indicated that the optimum condition for synthesizing Hexagonal Plate-like Al4SiC4 was 3 h sintering at 2073 K in flowing argon atmosphere. Al and Si formed when stoichiometric amount of silica was used. Al and Si with low melting point then melted and wrapped the Al4SiC4 grains, which promoted the nucleation of Al4SiC4.