J. A. H. Coaquira

Effects of the Fe doping on the physical properties and LPG gas detection of Fe-doped SnO2 films deposited by DC sputtering

Juan Carlos Romero Aquino, Maria del Carmen Alvarez Solis, Fermin Fidel Herrera Aragon, J. A. H. Coaquira et autres

The capacity to manufacture gas sensing materials with excellent sensitivity at room temperature is a focus of many studies; which could reduce manufacturing costs and expand their applications. In this regard, iron-doped SnO2 films were successfully grown via DC sputtering technique in …

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Evaluation of the potential for iron recovery in mining tailings by magnetic separation

Paulo Henrique Santana França, Luís Felipe Rodrigues Costa, Sávio Eduardo Oliveira Miranda, Bárbara Gonçalves Rocha et autres

• Tailings from the Quadrilátero Ferrífero/MG (17.82% Fe) revalued into a sustainable high-value resource; • Advanced tailing characterization and Fe recovery by high-efficiency magnetic separation; • High-quality Fe concentrate (56.64 %wt) produced from tailings for the metallurgy; • SiO 2 -rich byproduct …

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A Sustainable Route for the Synthesis of Highly Crystalline CeO2 Nanoparticles via Microwave-Assisted Solvothermal Processing without Surfactants

Wellington Marcos da Silva, Mauro Francisco Pinheiro da D Silva, Rodrigo Nunes de Souza, Mariana Lumi Ichihara Sado et autres

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Cu-Doped SnO 2 Nanocrystals: Tunable Magnetism, Critical Incorporation Limit, and Defect Configuration Analysis by EPR and Ab Initio DFT

Leonardo Villegas-Lelovsky, F.F.H. Aragón, Paulo Cesar de Morais, D. G. Pacheco‐Salazar et autres

High Resolution Image Download MS PowerPoint Slide Copper in oxide semiconductors exhibits distinct electronic and magnetic behavior depending on its oxidation state, with Cu 1+ acting as a nonmagnetic impurity and Cu 2+ contributing to the magnetic moment. In SnO 2, Cu …

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Tuning the structural, electrical, and optical properties of ITO thin films via thickness control and vacuum annealing

Carlos A. Vilca Huayhua, Bill D. Aparicio Huacarpuma, Luiz Antônio Ribeiro, Jorge Andres Guerra et autres

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Geochemistry, U-Pb geochronology, and Sm-Nd isotopes of the granitic rocks associated with the Rosa de Maio gold deposit in the Tapajós Mineral Province, Brazil: Magmatic evolution, source characterization, and implications for magma fertility

Pedro Victor F. de S. Alves, Nilson Francisquini Botelho, Valmir da Silva Souza, Lys Matos Cunha et autres

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Tailoring the Properties of Magnetite/PLA Nanocomposites: A Composition-Dependent Study

Mariana Martins de Melo Barbosa, Juliene Oliveira Campos de França, Quezia dos Santos Lima, Sílvia C.L. Dias et autres

This study focused on composites of magnetite magnetic nanoparticles (MNP) and poly(lactic acid) (PLA) prepared via sonochemical synthesis. The evaluation of MNP loadings (2, 5, 10, 15, and 20 wt.%) provided insights into the structural and reactivity properties of the materials. Methods …

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Synthesis and characterization of few-layered carbon nanotubes decorated with magnetic nanoparticles envisaging potential technological applications

Wellington Marcos da Silva, Mauro Francisco Pinheiro da Silva, Rodrigo Nunes de Souza, Alysson Martins Almeida Silva et autres

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Tailoring structural, electrical, and optical properties of ITO thin films via vacuum-pressure annealing: An experimental and theoretical study

Carlos A. Vilca Huayhua, Sunita Mishra, M.A.R. Martínez, Jorge Andres Guerra et autres

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Hydrothermally synthesized Fe3O4 microparticles: Structural, magnetic, Mössbauer and magneto-hyperthermia properties

Gopal Niraula, J. A. H. Coaquira, E. Cerda Reyes, Yasir Javed et autres

We present hydrothermally prepared Fe3O4 microparticles with diverse morphologies such as long micro-rods (LMRs), short micro-rods (SMRs), and micro-disks (MDs) through thermal-reduction of α-Fe2O3as support during the crystallization processes. The impact of PO43− anions was systematically explored with significant influence on tuning …

Influence of the thickness effect on the structural, morphological, vibrational, optical, electrical and gas sensor properties of polycrystalline CuO films

Bill D. Aparicio-Huacarpuma, Carlos A. Vilca Huayhua, A. Pandolfo Silveira, Sônia Nair Báo et autres

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A novel Fe/S catalyst approach used to successfully synthesize 2D hexagonal boron-nitride structures

Rodrigo Nunes de Souza, Mauro Francisco Pinheiro da Silva, Alysson Martins Almeida Silva, Alisson Mendes Rodrigues et autres

The synthesis of hexagonal boron nitride (h-BN) by the chemical vapor deposition (CVD) method using a novel catalyst (Fe/S) was explored in the present study. The Fe/S catalyst was employed to enhance the yield and quality of the nanosheets. Iron serves as …

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