RSS 1.0Departamento de Física, Química e Biologia
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An investigation of the synergistic effect between magnetite nanoparticles and polypyrrole in nanostructured layer-by-layer films
; Maciel, Cristiane C.
; ; Rubira, Rafael J. G. ; Constantino, Carlos J. L. ; (Journal of Applied Polymer Science, 2020) [Artigo]
In this paper, we report the controlled fabrication of layer-by-layer (LbL) films deposited on gold substrates with three different supramolecular architectures using polypyrrole (Ppy) and magnetite nanoparticles (Fe3O4-np), ... -
pH-responsive Ag@PAH nanoparticles applied in SERS
Furini, Leonardo N.; Costa, Gabriel ; Leopoldo Constantino, Carlos José ; Alessio, Priscila (Materials Letters, 2020) [Artigo]
We synthesized silver nanoparticles (AgNPs) coating with poly(allylamine) hydrochloride (PAH), which we named as Ag@PAH. While, the Ag core provides the SERS signal, the PAH shell helps enhancing the signal due to molecular ... -
UV Phototransistors-Based upon Spray Coated and Sputter Deposited ZnO TFTs
; Gomes, Tiago Carneiro; Alves, Neri ; ; ; (IEEE Sensors Journal, 2020) [Artigo]
A comparison of Zinc Oxide (ZnO) phototransistors prepared by spray and sputter coating process is presented. The work shows that spray coated layers provide significant advantages in sensor response over ZnO phototransistors ... -
Supramolecular architecture and electrical conductivity in organic semiconducting thin films
Diego Fernandes, José; Maximino, Mateus D. ; ; Pereira, Matheus S. ; De Almeida Olivati, Clarissa ; Constantino, Carlos J. L. ; Alessio, Priscila (Physical Chemistry Chemical Physics, 2020) [Artigo]
Organic thin films are an essential component of the structure of optical and electronic devices. However, the optical and electrical properties of these films depend on their supramolecular architecture, which may vary ... -
Electrical characterization of the Macusanite volcanic glass and influence of nuclear fission tracks on electrical conductivity
de Oliveira, Vinicius Jessé Rodrigues; Pereira, Luiz Augusto Stuani ; da Silva, Edilene Assunção ; Sáenz, Carlos Alberto Tello ; de Almeida Olivati, Clarissa (Radiation Physics and Chemistry, 2020) [Artigo]
Direct current dielectrical measurements were performed on samples of natural volcanic glass Macusanite with and without previous heat treatment at 650 °C for 10 h. Samples were analyzed via Source Measure Unit Keithley ... -
The effect of anodization parameters on the aluminum oxide dielectric layer of thin-film transistors
Gomes, Tiago C.; ; Alves, Neri ; ; Fugikawa-Santos, Lucas (Journal of Visualized Experiments, 2020) [Artigo]
Aluminum-oxide (Al2O3) is a low cost, easily processable and high dielectric constant insulating material that is particularly appropriate for use as the dielectric layer of thin-film transistors (TFTs). Growth of ... -
Understanding the langmuir and Langmuir-Schaefer film conformation of low-bandgap polymers and their bulk heterojunctions with PCBM
Silva, Edilene A.; ; Fernandes, José D. ; ; ; Constantino, Carlos J. L. ; ; ; (Nanotechnology, 2020) [Artigo]
Low-bandgap polymers are widely used as p-type components in photoactive layers of organic solar cells, due to their ability to capture a large portion of the solar spectrum. The comprehension of their supramolecular ... -
Correlating mono- and bilayers of lipids to investigate the pronounced effects of steroid hormone 17α-ethynylestradiol on membrane models of DPPC/cholesterol
Ruiz, Gilia Cristine Marques; Pazin, Wallance Moreira ; do Carmo Morato, Luis Fernando ; ; Constantino, Carlos José Leopoldo (Journal of Molecular Liquids, 2020) [Artigo]
Risks to human health have been reported owing to prolonged exposure to hormones, whose action depends on their molecular-level interaction with cell membranes. In this study, we investigate the interaction of the synthetic ... -
Correlating Artepillin C cytotoxic activity on HEp-2 cells with bioinspired systems of plasma membranes
Kobal, Mirella B.; Pazin, Wallance M. ; Bistaffa, Maria J. ; Constantino, Carlos J.L. ; Toledo, Karina A. ; Aoki, Pedro H.B. (Materials Science and Engineering C, 2020) [Artigo]
Artepillin C is the main compound present in propolis from Baccharis dracunculifolia, whose antitumor activity has been the focus of many studies. Herein, we shall investigate the Artepillin C mechanisms of action against ... -
Photoluminescence of Eu3+-doped CaZrO3 red-emitting phosphors synthesized via microwave-assisted hydrothermal method
Costa Macedo, Wagner; Germano Bispo Junior, Airton ; de Oliveira Rocha, Kleper ; de Souza Albas, Agda Eunice ; Pires, Ana Maria ; Rainho Teixeira, Silvio ; (Materials Today Communications, 2020) [Artigo]
Eu-doped 1, 3 and 5 % CaZrO3 red-emitting phosphors were synthesized for the first time using the microwave-assisted hydrothermal method followed by heat treatment at 1200 °C. After the crystallization, the orthorhombic ... -
Effects of consumption of contaminated feed with 2,4-dichlorophenoxyacetic acid (2,4-D) on the rat tibia: analysis by Raman spectroscopy and mechanical properties
; ; Furini, Leonardo Negri; Constantino, Carlos José Leopoldo ; ; ; (Lasers in Medical Science, 2020) [Artigo]
Studies reported the harmful effects of 2,4-D on body tissues, provoking changes in the anatomy and physiology of the kidneys, liver, and testicles. Thus, the objective was to evaluate if there were alterations in the bone ... -
Designing silver nanoparticles for detecting levodopa (3,4-dihydroxyphenylalanine, l-dopa) using surface-enhanced raman scattering (SERS)
Rubira, Rafael Jesus Gonçalves; Camacho, Sabrina Alessio ; Martin, Cibely Silva ; ; ; ; ; Alessio, Priscila ; Constantino, Carlos José Leopoldo (Sensors (Switzerland), 2020) [Artigo]
Detection of the drug Levodopa (3,4-dihydroxyphenylalanine, L-Dopa) is essential for the medical treatment of several neural disorders, including Parkinson’s disease. In this paper, we employed surface-enhanced Raman ... -
Electrospun natural rubber fibers-based flexible conductive membranes
Dognani, Guilherme; da Silva, André Antunes ; Cabrera, Flávio Camargo ; ; Saénz, Carlos Alberto Tello ; ; Job, Aldo Eloízo ; Agostini, Deuber Lincon da Silva (Revista Materia, 2020) [Artigo]
In recent years, the technique of electrospinning has been used to develop a novel class of micro-and nanoscale materials based on fibrous structures. Several polymers, in particular elastomers, that have been implemented ... -
Natural rubber composites with Grits waste from cellulose industry
Bacarin, Giovani B.; Dognani, Guilherme ; dos Santos, Renivaldo J. ; ; ; ; ; ; Cabrera, Flávio C. ; Job, Aldo E. (Journal of Material Cycles and Waste Management, 2020) [Artigo]
Tons of industrial residues are daily generated and require management strategies to be correctly disposed or recycled. Therefore, the reuse of organic and industrial wastes as fillers in polymeric composites has gained ... -
Carboxymethyl-botryosphaeran stabilized carbon nanotubes aqueous dispersion: A new platform design for electrochemical sensing of desloratadine
; Olean-Oliveira, André; ; ; ; ; Teixeira, Marcos F.S. ; (Talanta, 2020) [Artigo]
The polysaccharide carboxymethyl-botryosphaeran (CMB) was used to improve the dispersion of multi-walled carbon nanotubes (MWCNTs) in water. This feature was applied in modifying a glassy carbon electrode (GCE) to construct ... -
The Use of an rGO Semi-transparent Organic Electrode in a ZnO Schottky Diode for UV Detection
Vieira, Douglas Henrique; ; da Silva Ozório, Maíza ; Nogueira, Gabriel Leonardo ; ; Alves, Neri (Journal of Electronic Materials, 2019) [Artigo]
Successful manufacture of a simple, low cost sprayed Schottky diode compatible with printed electronics using reduced graphene oxide (rGO) as a semi-transparent top electrode and zinc oxide (ZnO) as active layer has been ... -
Textural and geochemical investigation of pyrite in Jacobina Basin, Sao Francisco Craton, Brazil: Implications for paleoenvironmental conditions and formation of pre-GOE metaconglomerate-hosted Au-(U) deposits
; ; ; ; ; ; Constantino, Carlos J. L. (Geochimica Et Cosmochimica Acta, 2020) [Artigo]
The Jacobina Basin has a well-preserved sedimentary record, including continental and marine deposits, and hosts Au-(U)Py mineralization in metaconglomerate beds similar to the Witwatersrand gold province. Based on ... -
Micro-Raman Spectroscopy of Zircon (ZrSiO4) Mineral at Annealing Conditions Usually Applied in Zircon Fission-Track Annealing Dataset
; Leopoldo Constantino, Carlos Jose; ; (Journal Of Nanoscience And Nanotechnology, 2020) [Artigo]
Raman analyzes were performed on zircon from a syenite located in the Pocos de Caldas Complex, Brazil, with a fission-track (FT) zircon age of 81.4 +/- 6.8 Ma. Three isochronous heating (1, 10 and 100 hours) of zircon ... -
Protective effects of bark ethanolic extract from Spondias dulcis Forst F. against DNA damage induced by benzo[ a] pyrene and cyclophosphamide
; ; ; ; ; Cavalcante, Dalita G. S. M.; Gomes, Andressa S. ; ; ; et al. (Genetics And Molecular Biology, 2019) [Artigo]
This study evaluated the genotoxicity, mutagenicity, antigenotoxicity, and antimutagenicity effects on biochemical parameters of oxidative stress of the Spondias dulcis bark ethanolic extract on mice. The extract was ... -
Ultrafast reflectivity dynamics in bis (n-butylimido) perylene thin films
; ; ; ; Constantino, C. J. L.; ; (2008 Conference On Lasers And Electro-optics & Quantum Electronics And Laser Science Conference, Vols 1-9, 2008) [Trabalho apresentado em evento]
Using pump-probe reflectometry, we study the ultrafast excited-state dynamics in thin films of BuPTCD, an organic semiconductor, deposited on gold nanoparticles. We observe depletion of the ground state and excited state ...