The Experts below are selected from a list of 7422 Experts worldwide ranked by ideXlab platform
Pethaiyan Jeevanandam - One of the best experts on this subject based on the ideXlab platform.
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Synthesis of Silica@Ni-Co Mixed Metal Oxide Core–Shell Nanorattles and Their Potential Use as Effective Adsorbents for Waste Water Treatment
European Journal of Inorganic Chemistry, 2015Co-Authors: Syam Kandula, Pethaiyan JeevanandamAbstract:SiO2@Ni-Co Mixed Metal Oxide core–shell nanorattles with different Ni2+/Co2+ molar ratios have been successfully synthesized through a facile, inexpensive self-template route by the calcination of SiO2@Ni-Co layered double hydrOxides at 500 °C. The formation of SiO2@Ni-Co Mixed Metal Oxide core–shell nanorattles has been confirmed by an array of characterization techniques. Field-emission scanning electron microscopy (FE-SEM) analysis indicates a hierarchical flowerlike morphology for the SiO2@Ni-Co Mixed Metal Oxide core–shell nanorattles, and transmission electron microscopy (TEM) analysis confirms the formation of core–shell nanorattles. The diffuse reflectance spectra of the SiO2@Ni-Co Mixed Metal Oxide core–shell nanorattles show two band-gap absorptions attributed to Metal-to-ligand charge-transfer transitions (Mn+→O2–). The SiO2@Ni-Co Mixed Metal Oxide core–shell nanorattles have been explored as effective adsorbents for the removal of rhodamine B, methylene blue, and their mixture from aqueous solutions. The adsorption of the single dye systems follows Langmuir and Freundlich isotherms, whereas a binary Langmuir model has been applied for the binary dye systems. The SiO2@Ni-Co Mixed Metal Oxide core–shell nanorattles possess higher adsorption capacity for the individual dyes than for the mixture of dyes. Kinetic studies indicate that the adsorptions of rhodamine B, methylene blue, and their mixture follow pseudo-second-order kinetics.
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synthesis of tio2 mgo Mixed Metal Oxide nanoparticles via a sol gel method and studies on their optical properties
Ceramics International, 2014Co-Authors: Nisha Bayal, Pethaiyan JeevanandamAbstract:Abstract TiO 2 −MgO Mixed Metal Oxide nanoparticles with variable MgO content were prepared by a simple sol−gel method. The nanoparticles were characterized by power X-ray diffraction, field emission scanning electron microscopy coupled with energy dispersive X-ray analysis, transmission electron microscopy and UV−visible diffuse reflectance spectroscopy. X-ray diffraction results indicate that the presence of MgO prevents the complete transformation of anatase to rutile in the TiO 2 −MgO Mixed Metal Oxide nanoparticles prepared using lower MgO content even at 900 °C. The presence of MgO in TiO 2 −MgO nanoparticles suppresses the crystal growth of TiO 2 leading to a blue-shift of its band gap. The TiO 2 −MgO samples prepared using higher MgO content and calcined at 700 °C and 900 °C lead to Mixed Metal Oxide nanoparticles with high band gap (~4.3 eV) due to the formation of MgTiO 3 .
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Synthesis of TiO2−MgO Mixed Metal Oxide nanoparticles via a sol−gel method and studies on their optical properties
Ceramics International, 2014Co-Authors: Nisha Bayal, Pethaiyan JeevanandamAbstract:Abstract TiO 2 −MgO Mixed Metal Oxide nanoparticles with variable MgO content were prepared by a simple sol−gel method. The nanoparticles were characterized by power X-ray diffraction, field emission scanning electron microscopy coupled with energy dispersive X-ray analysis, transmission electron microscopy and UV−visible diffuse reflectance spectroscopy. X-ray diffraction results indicate that the presence of MgO prevents the complete transformation of anatase to rutile in the TiO 2 −MgO Mixed Metal Oxide nanoparticles prepared using lower MgO content even at 900 °C. The presence of MgO in TiO 2 −MgO nanoparticles suppresses the crystal growth of TiO 2 leading to a blue-shift of its band gap. The TiO 2 −MgO samples prepared using higher MgO content and calcined at 700 °C and 900 °C lead to Mixed Metal Oxide nanoparticles with high band gap (~4.3 eV) due to the formation of MgTiO 3 .
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Synthesis of NiO Based BiMetallic Mixed Metal Oxide Nanoparticles by Sol-Gel Method
Advanced Materials Research, 2012Co-Authors: Nisha Bayal, Pethaiyan JeevanandamAbstract:Nickel Oxide based biMetallic Mixed Metal Oxide nanoparticles are of considerable interest and they have been used as catalysts for NOx decomposition and as reactive adsorbents for ultra deep desulfurization. In the present study, nanoparticles of NiO-ZnO, NiO-CuO and NiO-MgO were synthesized by sol-gel method. The Mixed Metal Oxide nanoparticles were characterized by X-ray diffraction, diffuse reflectance spectroscopy, field emission scanning electron microscopy and transmission electron microscopy. Pure NiO nanoparticles show a band gap of 4.24 eV and the band gap shows a blue shift or red shift in the case of Mixed Metal Oxide nanoparticles.
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synthesis of cuo nio core shell nanoparticles by homogeneous precipitation method
Journal of Alloys and Compounds, 2012Co-Authors: Nisha Bayal, Pethaiyan JeevanandamAbstract:Abstract Core-shell CuO–NiO Mixed Metal Oxide nanoparticles in which CuO is the core and NiO is the shell have been successfully synthesized using homogeneous precipitation method. This is a simple synthetic method which produces first a layered double hydrOxide precursor with core-shell morphology which on calcination at 350 °C yields the Mixed Metal Oxide nanoparticles with the retention of core-shell morphology. The CuO–NiO Mixed Metal Oxide precursor and the core-shell nanoparticles were characterized by powder X-ray diffraction, FT-IR spectroscopy, thermal gravimetric analysis, elemental analysis, scanning electron microscopy, transmission electron microscopy, and diffuse reflectance spectroscopy. The chemical reactivity of the core-shell nanoparticles was tested using catalytic reduction of 4-nitrophenol with NaBH4. The possible growth mechanism of the particles with core-shell morphology has also been investigated.
Guangming Zeng - One of the best experts on this subject based on the ideXlab platform.
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enhanced visible light driven photocatalytic removal of refractory pollutants by zn fe Mixed Metal Oxide derived from layered double hydrOxide
Catalysis Communications, 2017Co-Authors: Qi Yang, Shana Wang, Fei Chen, Cheng Gong, Xiaolin Wang, Jiawei Wu, Xiaoming Li, Dongbo Wang, Guangming ZengAbstract:Abstract In this study, two typical refractory organic pollutants, methylene blue (MB) and tetracycline (TC) was effectively degraded under visible-light irradiation catalyzed by Zn/Fe Mixed Metal Oxide (Zn/Fe-MMO) nanocomposite, which derived from the high-temperature calcination of Zn/Fe layered double hydrOxide (Zn/Fe-LDH). The Zn/Fe-MMO was composed of wurzite ZnO phases and spinel-structured ZnFe 2 O 4 . The Zn/Fe-MMO exhibited superior photocatalytic activity than Zn/Fe-LDH precursor owing to the better crystallinity, broader visible light adsorption, and higher photo-generated electron-hole pairs separation efficiency. Simple assembling method, high photocatalytic activity to the degradation of organic pollutants and good reusability make Zn/Fe-MMO has great potential in practical wastewater treatment.
Bryan D. Vogt - One of the best experts on this subject based on the ideXlab platform.
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control of threshold voltage and saturation mobility using dual active layer device based on amorphous Mixed Metal Oxide semiconductor on flexible plastic substrates
IEEE Transactions on Electron Devices, 2011Co-Authors: Michael A. Marrs, Edward J. Bawolek, Jovan Trujillo, Gregory B. Raupp, Curtis Moyer, Rita Cordova, Bryan D. VogtAbstract:Amorphous Oxide semiconductor thin-film transistors on flexible plastic substrates typically suffer from performance and stability issues related to the maximum processing temperature limitation of the polymer. A novel device architecture based on a dual active layer enables significant improvements in both performance and stability. Device fabrication occurs below 200°C on a polyethylene naphthalate (PEN) substrate using Mixed Metal Oxides of either zinc indium Oxide (ZIO) or indium gallium zinc Oxide (IGZO) as the active semiconductor. The dual-active-layer architecture allows for adjustment in the saturation mobility and threshold voltage stability without the requirement of high-temperature annealing, which is not compatible with flexible plastic substrates. The device performance and stability is strongly dependent on the composition of the Mixed Metal Oxide; this dependence provides a simple route to independently adjust the threshold voltage stability and drive performance. By switching from a single to a dual active layer, the saturation mobility increases from 1.2 to 18.0 cm2/V·s , whereas the rate of the threshold voltage shift decreases by an order of magnitude. This approach could assist in enabling the production of devices on flexible substrates using amorphous Oxide semiconductors in the near future.
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Control of Threshold Voltage and Saturation Mobility Using Dual-Active-Layer Device Based on Amorphous Mixed Metal–Oxide–Semiconductor on Flexible Plastic Substrates
IEEE Transactions on Electron Devices, 2011Co-Authors: Michael A. Marrs, Curtis D. Moyer, Edward J. Bawolek, Rita J. Cordova, Jovan Trujillo, Gregory B. Raupp, Bryan D. VogtAbstract:Amorphous Oxide semiconductor thin-film transistors on flexible plastic substrates typically suffer from performance and stability issues related to the maximum processing temperature limitation of the polymer. A novel device architecture based on a dual active layer enables significant improvements in both performance and stability. Device fabrication occurs below 200°C on a polyethylene naphthalate (PEN) substrate using Mixed Metal Oxides of either zinc indium Oxide (ZIO) or indium gallium zinc Oxide (IGZO) as the active semiconductor. The dual-active-layer architecture allows for adjustment in the saturation mobility and threshold voltage stability without the requirement of high-temperature annealing, which is not compatible with flexible plastic substrates. The device performance and stability is strongly dependent on the composition of the Mixed Metal Oxide; this dependence provides a simple route to independently adjust the threshold voltage stability and drive performance. By switching from a single to a dual active layer, the saturation mobility increases from 1.2 to 18.0 cm2/V·s , whereas the rate of the threshold voltage shift decreases by an order of magnitude. This approach could assist in enabling the production of devices on flexible substrates using amorphous Oxide semiconductors in the near future.
Nisha Bayal - One of the best experts on this subject based on the ideXlab platform.
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Synthesis of TiO2−MgO Mixed Metal Oxide nanoparticles via a sol−gel method and studies on their optical properties
Ceramics International, 2014Co-Authors: Nisha Bayal, Pethaiyan JeevanandamAbstract:Abstract TiO 2 −MgO Mixed Metal Oxide nanoparticles with variable MgO content were prepared by a simple sol−gel method. The nanoparticles were characterized by power X-ray diffraction, field emission scanning electron microscopy coupled with energy dispersive X-ray analysis, transmission electron microscopy and UV−visible diffuse reflectance spectroscopy. X-ray diffraction results indicate that the presence of MgO prevents the complete transformation of anatase to rutile in the TiO 2 −MgO Mixed Metal Oxide nanoparticles prepared using lower MgO content even at 900 °C. The presence of MgO in TiO 2 −MgO nanoparticles suppresses the crystal growth of TiO 2 leading to a blue-shift of its band gap. The TiO 2 −MgO samples prepared using higher MgO content and calcined at 700 °C and 900 °C lead to Mixed Metal Oxide nanoparticles with high band gap (~4.3 eV) due to the formation of MgTiO 3 .
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synthesis of tio2 mgo Mixed Metal Oxide nanoparticles via a sol gel method and studies on their optical properties
Ceramics International, 2014Co-Authors: Nisha Bayal, Pethaiyan JeevanandamAbstract:Abstract TiO 2 −MgO Mixed Metal Oxide nanoparticles with variable MgO content were prepared by a simple sol−gel method. The nanoparticles were characterized by power X-ray diffraction, field emission scanning electron microscopy coupled with energy dispersive X-ray analysis, transmission electron microscopy and UV−visible diffuse reflectance spectroscopy. X-ray diffraction results indicate that the presence of MgO prevents the complete transformation of anatase to rutile in the TiO 2 −MgO Mixed Metal Oxide nanoparticles prepared using lower MgO content even at 900 °C. The presence of MgO in TiO 2 −MgO nanoparticles suppresses the crystal growth of TiO 2 leading to a blue-shift of its band gap. The TiO 2 −MgO samples prepared using higher MgO content and calcined at 700 °C and 900 °C lead to Mixed Metal Oxide nanoparticles with high band gap (~4.3 eV) due to the formation of MgTiO 3 .
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Synthesis of NiO Based BiMetallic Mixed Metal Oxide Nanoparticles by Sol-Gel Method
Advanced Materials Research, 2012Co-Authors: Nisha Bayal, Pethaiyan JeevanandamAbstract:Nickel Oxide based biMetallic Mixed Metal Oxide nanoparticles are of considerable interest and they have been used as catalysts for NOx decomposition and as reactive adsorbents for ultra deep desulfurization. In the present study, nanoparticles of NiO-ZnO, NiO-CuO and NiO-MgO were synthesized by sol-gel method. The Mixed Metal Oxide nanoparticles were characterized by X-ray diffraction, diffuse reflectance spectroscopy, field emission scanning electron microscopy and transmission electron microscopy. Pure NiO nanoparticles show a band gap of 4.24 eV and the band gap shows a blue shift or red shift in the case of Mixed Metal Oxide nanoparticles.
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synthesis of cuo nio core shell nanoparticles by homogeneous precipitation method
Journal of Alloys and Compounds, 2012Co-Authors: Nisha Bayal, Pethaiyan JeevanandamAbstract:Abstract Core-shell CuO–NiO Mixed Metal Oxide nanoparticles in which CuO is the core and NiO is the shell have been successfully synthesized using homogeneous precipitation method. This is a simple synthetic method which produces first a layered double hydrOxide precursor with core-shell morphology which on calcination at 350 °C yields the Mixed Metal Oxide nanoparticles with the retention of core-shell morphology. The CuO–NiO Mixed Metal Oxide precursor and the core-shell nanoparticles were characterized by powder X-ray diffraction, FT-IR spectroscopy, thermal gravimetric analysis, elemental analysis, scanning electron microscopy, transmission electron microscopy, and diffuse reflectance spectroscopy. The chemical reactivity of the core-shell nanoparticles was tested using catalytic reduction of 4-nitrophenol with NaBH4. The possible growth mechanism of the particles with core-shell morphology has also been investigated.
Qi Yang - One of the best experts on this subject based on the ideXlab platform.
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enhanced visible light driven photocatalytic removal of refractory pollutants by zn fe Mixed Metal Oxide derived from layered double hydrOxide
Catalysis Communications, 2017Co-Authors: Qi Yang, Shana Wang, Fei Chen, Cheng Gong, Xiaolin Wang, Jiawei Wu, Xiaoming Li, Dongbo Wang, Guangming ZengAbstract:Abstract In this study, two typical refractory organic pollutants, methylene blue (MB) and tetracycline (TC) was effectively degraded under visible-light irradiation catalyzed by Zn/Fe Mixed Metal Oxide (Zn/Fe-MMO) nanocomposite, which derived from the high-temperature calcination of Zn/Fe layered double hydrOxide (Zn/Fe-LDH). The Zn/Fe-MMO was composed of wurzite ZnO phases and spinel-structured ZnFe 2 O 4 . The Zn/Fe-MMO exhibited superior photocatalytic activity than Zn/Fe-LDH precursor owing to the better crystallinity, broader visible light adsorption, and higher photo-generated electron-hole pairs separation efficiency. Simple assembling method, high photocatalytic activity to the degradation of organic pollutants and good reusability make Zn/Fe-MMO has great potential in practical wastewater treatment.