9 documents found, page 1 of 1
One- and two-dimensional structures based on gallium nitride
Fabris, Guilherme S.L. [UNESP]; Paskocimas, Carlos A.; Sambrano, Julio R. [UNESP]; Paupitz, Ricardo [UNESP]Made available in DSpace on 2022-04-28T19:43:44Z (GMT). No. of bitstreams: 0 Previous issue date: 2021-11-01; Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES); Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq); Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP); Universidade Estadual Paulista; Physical and chemical properties of non-conventional 2D and tubular st...
Preparation and characterization of in(OH)3: Eu nanostructures obtained by micr...
Motta, Fabiana V.; Marques, Ana Paula A.; Paskocimas, Carlos A.; Bomio, Mauricio R. D.; Abreu, Maria Fernanda C.; Li, Máximo S.; Leite, Edson R.Made available in DSpace on 2022-04-29T09:12:37Z (GMT). No. of bitstreams: 0 Previous issue date: 2012-03-01; Crystalline europium-doped indium hydroxide (In(OH)3:Eu) nanostructures were prepared by a rapid and efficient Microwave-Assisted Hydrothermal (MAH) method. Nanostructures were obtained at a low temperature. FE-SEM images confirm that these samples are composed of 3D nanostructures. XRD, optical diffuse...
A promising nanoporous AlxGa(1-x)N nanosheet based on octagraphene
Fabris, Guilherme S.L.; Paskocimas, Carlos A.; Sambrano, Julio R. [UNESP]; Paupitz, Ricardo [UNESP]Made available in DSpace on 2021-06-25T10:15:41Z (GMT). No. of bitstreams: 0 Previous issue date: 2021-02-01; A new class of 2D inorganic materials named octa-AlxGa(1-x)N (x=0,0.25,0.5,0.75and1) with the octa-graphene architecture is theoretically investigated by Density Functional Theory simulations. It was found that the energy band gap increased with the introduction of Al atoms. The calculated Young modulus...
New 2D nanosheets based on the octa-graphene
Fabris, Guilherme S.L. [UNESP]; Paskocimas, Carlos A.; Sambrano, Julio R. [UNESP]; Paupitz, Ricardo [UNESP]Made available in DSpace on 2020-12-12T01:33:13Z (GMT). No. of bitstreams: 0 Previous issue date: 2020-10-01; Universidade Estadual Paulista; Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP); Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq); A class of 2D structures based on the architecture of the so called octa-graphene is proposed and theoretically investigated for the first ...
Environmentally friendly synthesis methods to obtain the misfit [Ca2CoO3-δ]0.62...
Emerenciano, Aline A.; Araújo, Allan J. M.; Grilo, João P. F.; Macedo, Daniel A.; Rasekh, Shahed; Kovalevsky, Andrei V.; Paskocimas, Carlos A.This work reports the microstructural and thermoelectric characterization of the misfit [Ca2CoO3-δ]0.62[CoO2] compound obtained by a solid-state synthesis using mollusk shells and a proteic sol-gel method, which uses gelatin as a polymerizing agent. The results clearly demonstrate the capability of these routes to produce pure Ca3Co4O9 with plate-like morphology. Sintered ceramic samples show randomly oriented ...
Battery-like behavior of Ni-ceria based systems: synthesis, surface defects and...
Araújo, Allan J.M.; Silva, Vinícius D.; Sousa, Angel R.O.; Grilo, João P.F.; Simões, Thiago A.; Macedo, Daniel A.; Nascimento, Rubens M.NiO, CeO2 and respective composites are extensively used in energy storage devices due to mostly their high electrochemical activity. However, the assessment of battery-like behavior of Ni-ceria based systems comprising (Ni or Gd)-doped ceria combined with NiO seems to be neglected in the literature. In this work, NiO and ceria-based solid solutions composite powders were obtained by a co-precipitation synthesi...
Development of porous alumina membranes for treatment of textile effluent
Silva, Késia Karina O. S.; Paskocimas, Carlos A.; Oliveira, Fernando R.; Nascimento, José Heriberto Oliveira do; Zille, AndreaCeramic porous membranes sintered at two different temperature using polyvinyl alcohol and ethylene glycol as binders, and composed of two types of α-alumina with different particle sizes were investigated for the microfiltration of a textile effluent containing indigo dye, auxiliaries, heavy metals, oils, and solids. The physicochemical properties of the membranes and effluent were evaluated. X-ray diffraction...
Ni-CGO cermet anodes from nanocomposite powders: Microstructural and electroche...
Macedo, Daniel A.; Figueiredo, Filipe M. L.; Paskocimas, Carlos A.; Martinelli, Antonio E.; Nascimento, Rubens M.; Marques, Fernando M. B.In this study, composite powders synthesized by a novel one-step sol-gel method were used to obtain Ni-CGO anodes, while anodes of the same composition prepared from commercial powders were used as reference. The anodes performance was studied by impedance spectroscopy and dc polarization in the temperature range of 650-750 degrees C in flowing humidified 10% H-2+90% N-2 gas mixtures, using a three-electrode co...
A versatile route for the preparation of Ni-CGO cermets from nanocomposite powders
Macedo, Daniel A.; Souza, Graziele L.; Cela, Beatriz; Paskocimas, Carlos A.; Martinelli, Antonio E.; Figueiredo, Filipe M. L.; Marques, Fernando M. B.A comparative microstructural study between Ni-Ce0.9Gd0.1O1.95 (Ni-CGO) anodes obtained from NiO-CGO nanocomposite powders prepared by in situ one-step synthesis and by mechanical mixture (two-step synthesis) of NiO and CGO powders is reported. The open porosity and microstructure of sintered and reduced pellets were investigated as a function of the citric acid content used as pore forming agent. Nanosized cry...