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Siddhartha Mukherjee - One of the best experts on this subject based on the ideXlab platform.
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Isothermal in Situ Reduction kinetics of CoCl2-SiO2 gels to Co-SiO2 nanocomposites
Thermochimica Acta, 1999Co-Authors: Amitava Basumallick, G. C. Das, Siddhartha MukherjeeAbstract:Abstract In Situ Reduction kinetics of CoCl 2 –SiO 2 gel to Co–SiO 2 nanocomposite in the 800–950°C range has been studied. The presence of nanosized metallic Co in the host matrix has been established from the X-ray diffraction patterns of the reduced gels. The metallic particle size has been found to be 17 and 23 nm when reduced at 850° and 950°C, respectively. Nucleation and growth type of mechanism remain operative during the course of the Reduction. The activation energy is found to be in the range of 55–61 kJ/mol.
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IN Situ Reduction KINETICS OF NICL2 IN SIO2 GEL MATRIX
Journal of Materials Research, 1995Co-Authors: Amitava Basumallick, K. Biswas, G. C. Das, Siddhartha MukherjeeAbstract:Silica gcls containing NiCl2 and dextrose have been reduced by heat-treating the gels under N2 atmosphere at 800 °C, 850 °C, 900 °C, and 950 °C, respectively. The influence of the volume ratio of ethyl alcohol to tetraethylorthosilicate and the amount of dextrose on the in Situ Reduction kinetics of NiCl2 in gel matrix have been investigated. The kinetic data on in Situ Reduction have been analyzed by a reduced time method which indicates that mixed mechanisms are operative. The predominant mechanism of Reduction of NiCl2 in SiO2 gel matrix is of nucleation and growth type. The activation energies over different temperatures and fraction converted have been computed by the integration method.
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Isothermalin Situ Reduction kinetic analysis of NiCl2-containing gel
Bulletin of Materials Science, 1993Co-Authors: G. C. Das, Amitava Basumallick, Kinjalkini Biswas, Siddhartha MukherjeeAbstract:Isothermalin Situ Reduction kinetic study of NiCl2-containing gel was carried out. The detailed statistical as well as reduced time analysis show that contracting geometry and nucleation and growth type of mixed mechanisms are operative. The activation energy for Reduction is in the range 158–193 kJ/mol. Thermal analysis on NiCl2-containing gel was carried out in the temperature range 800°C to 900°C.
Amitava Basumallick - One of the best experts on this subject based on the ideXlab platform.
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Isothermal in Situ Reduction kinetics of CoCl2-SiO2 gels to Co-SiO2 nanocomposites
Thermochimica Acta, 1999Co-Authors: Amitava Basumallick, G. C. Das, Siddhartha MukherjeeAbstract:Abstract In Situ Reduction kinetics of CoCl 2 –SiO 2 gel to Co–SiO 2 nanocomposite in the 800–950°C range has been studied. The presence of nanosized metallic Co in the host matrix has been established from the X-ray diffraction patterns of the reduced gels. The metallic particle size has been found to be 17 and 23 nm when reduced at 850° and 950°C, respectively. Nucleation and growth type of mechanism remain operative during the course of the Reduction. The activation energy is found to be in the range of 55–61 kJ/mol.
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IN Situ Reduction KINETICS OF NICL2 IN SIO2 GEL MATRIX
Journal of Materials Research, 1995Co-Authors: Amitava Basumallick, K. Biswas, G. C. Das, Siddhartha MukherjeeAbstract:Silica gcls containing NiCl2 and dextrose have been reduced by heat-treating the gels under N2 atmosphere at 800 °C, 850 °C, 900 °C, and 950 °C, respectively. The influence of the volume ratio of ethyl alcohol to tetraethylorthosilicate and the amount of dextrose on the in Situ Reduction kinetics of NiCl2 in gel matrix have been investigated. The kinetic data on in Situ Reduction have been analyzed by a reduced time method which indicates that mixed mechanisms are operative. The predominant mechanism of Reduction of NiCl2 in SiO2 gel matrix is of nucleation and growth type. The activation energies over different temperatures and fraction converted have been computed by the integration method.
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Isothermalin Situ Reduction kinetic analysis of NiCl2-containing gel
Bulletin of Materials Science, 1993Co-Authors: G. C. Das, Amitava Basumallick, Kinjalkini Biswas, Siddhartha MukherjeeAbstract:Isothermalin Situ Reduction kinetic study of NiCl2-containing gel was carried out. The detailed statistical as well as reduced time analysis show that contracting geometry and nucleation and growth type of mixed mechanisms are operative. The activation energy for Reduction is in the range 158–193 kJ/mol. Thermal analysis on NiCl2-containing gel was carried out in the temperature range 800°C to 900°C.
G. C. Das - One of the best experts on this subject based on the ideXlab platform.
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Preparation of silica-molybdenum carbide nanocomposite by in Situ Reduction
Transactions of the Indian Ceramic Society, 2003Co-Authors: Sathi Mallick, S. Mukherjee, Manoj K. Mitra, G. C. DasAbstract:Molybdenum carbide has been formed in the silica gel matrix by the in Situ Reduction of ammonium molybdate. The average particle size of molybdenum carbide is in the range of 5-15 nm. The detailed XRD analyses coupled with thermodynamic arguments show that Reduction of ammonium molybdate is predominantly by in Situ generated hydrogen.
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Isothermal in Situ Reduction kinetics of CoCl2-SiO2 gels to Co-SiO2 nanocomposites
Thermochimica Acta, 1999Co-Authors: Amitava Basumallick, G. C. Das, Siddhartha MukherjeeAbstract:Abstract In Situ Reduction kinetics of CoCl 2 –SiO 2 gel to Co–SiO 2 nanocomposite in the 800–950°C range has been studied. The presence of nanosized metallic Co in the host matrix has been established from the X-ray diffraction patterns of the reduced gels. The metallic particle size has been found to be 17 and 23 nm when reduced at 850° and 950°C, respectively. Nucleation and growth type of mechanism remain operative during the course of the Reduction. The activation energy is found to be in the range of 55–61 kJ/mol.
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IN Situ Reduction KINETICS OF NICL2 IN SIO2 GEL MATRIX
Journal of Materials Research, 1995Co-Authors: Amitava Basumallick, K. Biswas, G. C. Das, Siddhartha MukherjeeAbstract:Silica gcls containing NiCl2 and dextrose have been reduced by heat-treating the gels under N2 atmosphere at 800 °C, 850 °C, 900 °C, and 950 °C, respectively. The influence of the volume ratio of ethyl alcohol to tetraethylorthosilicate and the amount of dextrose on the in Situ Reduction kinetics of NiCl2 in gel matrix have been investigated. The kinetic data on in Situ Reduction have been analyzed by a reduced time method which indicates that mixed mechanisms are operative. The predominant mechanism of Reduction of NiCl2 in SiO2 gel matrix is of nucleation and growth type. The activation energies over different temperatures and fraction converted have been computed by the integration method.
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Isothermalin Situ Reduction kinetic analysis of NiCl2-containing gel
Bulletin of Materials Science, 1993Co-Authors: G. C. Das, Amitava Basumallick, Kinjalkini Biswas, Siddhartha MukherjeeAbstract:Isothermalin Situ Reduction kinetic study of NiCl2-containing gel was carried out. The detailed statistical as well as reduced time analysis show that contracting geometry and nucleation and growth type of mixed mechanisms are operative. The activation energy for Reduction is in the range 158–193 kJ/mol. Thermal analysis on NiCl2-containing gel was carried out in the temperature range 800°C to 900°C.
Yang Zuo - One of the best experts on this subject based on the ideXlab platform.
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low temperature cu joining by in Situ Reduction sintering of cuo nanoparticle for high power electronics
Advanced Powder Technology, 2020Co-Authors: Yang Zuo, Liam Mills, Sadie Cartersearjeant, Mark Green, S H MannanAbstract:Abstract Cu nanoparticles are promising interconnection material due to low cost and superior conductivity while they readily oxidize and need special processing and storing conditions. To solve these problems, a specific in Situ Reduction-sintering of CuO nanoparticles was developed and oxide free Cu submicron particles suitable for sintering were fabricated. The surfaces of the Cu submicron particles show no obvious oxide structure even after air sintering at 220 °C for 15 min and Cu-Cu joints with high shear strength of 22 MPa were produced. The oxide forms during longer bonding durations had a morphological evolution from stripe into grain and developed different layer structures on Cu particle surface. The micro-fracture mechanism of sintered Cu particles was analyzed and Cu particles were found to deform plastically while the surface oxide show obvious brittle fracture. Variation in shear strength with bonding time was analyzed and simulated based on contact area theory and the degradation of shear strength was correlated to the oxide formation. The proposed method produces similar shear strengths to Cu nanoparticle sintered joints but without the need for pressurized sintering or protective gas atmospheres.
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High bond strength Cu joints fabricated by rapid and pressureless in Situ Reduction-sintering of Cu nanoparticles
Materials Letters, 2020Co-Authors: Yang Zuo, Sadie Carter-searjeant, Mark A. Green, Liam Mills, Samjid H. MannanAbstract:Abstract By using a novel in Situ Reduction-sintering process, the native oxide on Cu nanoparticle surface was removed and obvious oxide was not found even after sintering in air. Pressureless sintering at 220 °C for 5 min resulted in a high joint shear strength of over 30 MPa. The growth of oxide on Cu nanoparticle surfaces during storage was studied and the level of oxide film that hinders sintering was also determined. The consolidation behavior of Cu nanoparticles during sintering was observed. The results show that the sintering density of Cu nanoparticles peaked after only 5 min and the formation of dislocations were observed in the sintered structure after prolonged heating times.
Zhen Zhou - One of the best experts on this subject based on the ideXlab platform.
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Simultaneous removal of phosphorus and dissolved organic matter from a sludge in Situ Reduction process effluent by coagulants
RSC Advances, 2017Co-Authors: Zhen Zhou, Weimin Qiao, Wei Pan, Zhihui ChenAbstract:Owing to the long solids retention time and effective sludge decay, the increase in the amount of phosphorus and dissolved organic matter (DOM) in effluents is a major obstacle to the sludge in Situ Reduction process.
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A micro-aerobic hydrolysis process for sludge in Situ Reduction: performance and microbial community structure.
Bioresource technology, 2014Co-Authors: Zhen Zhou, Weimin Qiao, Can Xing, Xuelian Shen, Luochun WangAbstract:A sludge process Reduction activated sludge (SPRAS) system by inserting a sludge process Reduction (SPR) module, composed of a micro-aerobic tank and a settler, before activated sludge process was operated for sludge in Situ Reduction. The average removal efficiencies of COD and ammonium nitrogen were 86.6% and 87.9%, respectively. Compared to anoxic/aerobic (AO) process, SPRAS process reduced sludge production by 57.9% with observed sludge yield of 0.076 gVSS/gCOD. Pyrosequencing analyses revealed that the relative abundance and stability of microbial communities in SPRAS system were higher than AO system. Fermentative acidogenic classes Anaerolineae, Actinobacteria, Cytophagia and Caldilineae were enriched in the SPR module and responsible for sludge Reduction. Specific comparison down to the genus level identified the enrichment of oxyanion-reducing bacteria (Sulfuritalea; Azospira; Ramlibacter), fermentative acidogenic bacteria (Propionivibrio; Opitutus; Caldilinea), slow growers (Ramlibacter) and predatory bacteria (Myxobacteria) in SPRAS system. Nitrifiers were also more abundant in SPRAS system than AO system.
