A5028979575- Analytical chemistry methods development
- Electrochemical Analysis and Applications
- Analytical Chemistry and Sensors
- Electrochemical sensors and biosensors
- Carbon and Quantum Dots Applications
- Mass Spectrometry Techniques and Applications
- Antibiotics Pharmacokinetics and Efficacy
- Nanocluster Synthesis and Applications
- Analytical Chemistry and Chromatography
- Pesticide Residue Analysis and Safety
- Analytical Methods in Pharmaceuticals
- Quantum Dots Synthesis And Properties
- Gold and Silver Nanoparticles Synthesis and Applications
- Advanced biosensing and bioanalysis techniques
- Luminescence and Fluorescent Materials
- Molecular Sensors and Ion Detection
- X-ray Diffraction in Crystallography
- Laser-induced spectroscopy and plasma
- Cancer therapeutics and mechanisms
- Crystallization and Solubility Studies
- Mercury impact and mitigation studies
- Microfluidic and Capillary Electrophoresis Applications
- Bioactive Compounds and Antitumor Agents
- Laser-Ablation Synthesis of Nanoparticles
- Advanced Chemical Sensor Technologies
Pontifical Catholic University of Rio de Janeiro
2016-2025
International Iberian Nanotechnology Laboratory
2018
University of Florida
1998-2000
Universidade Federal de Santa Catarina
2000
Universidad del Valle
1997
Universidade de Brasília
1994-1995
Bamboo, like wood, is a promising natural template for biobased devices that takes advantage of its hierarchical architecture, microarray channels, anisotropic mechanical and electrical properties. Herein we report low heat thermal treatment (HTT, 700-1000 °C) bamboo specimens to obtain bamboo-based graphitic with thermoelectric electrochemical The preservation the highly architecture three-dimensional carbon material (3D-CM) allowed adding specific properties depending on HTT pristine...
A method to quantify quercetin (QUE) was developed based on the quenching effect this flavonoid exerts photoluminescence of 3-mercaptopropioni acid (3MPA) CdTe quantum dots (QDs) in aqueous solution. The luminescence (460/527 nm) from 3MPA-CdTe QDs (at an estimated 1.5 10-7 mol L-1) produced a linear relationship (R2 0.990) between quenched normalized signal function QUE concentration 5.0 10-6 and 6.0 10-5 L-1. proposed successfully used presence other flavonoids vitamin C with limit...
The method developed for the determination of lapachone isomers ( α ‐ and β ‐lapachones) involves use square wave voltammetry (SWV) with an electrode based on epoxy–graphite composite. electrolytic aqueous solution contained a cationic surfactant (CTAB), phosphate buffer (pH 6.0), KNO 3 . addition CTAB enhanced analyte diffusion into electrode–solution interface, improving detection through SWV. Under chosen conditions, ‐lapachone respectively present reversible quasireversible processes....
A mercury film electrode was used to determine direct and simultaneously Pb(II) (at −410 mV) Cu(II) −100 in biodiesel by anodic stripping voltammetry. linear response obtained for the 2.00 × 10−8–1.00 10−7 mol L−1 concentration range detection limits were 2.91 10−9 4.69 Cu(II), respectively, with recovery around of 100.0%.
Studies aimed at the development of analytical methods based on electrothermal atomic absorption spectrometry for determination antimony, selenium and arsenic in gasoline kerosene were performed. The goal was to develop sensitive that allow a simple calibration procedure be used through direct correlation between analyte signals measured sample from aqueous standards. This possible by optimization both preparation furnace conditions. platform atomization technique together with chemical...
We study the potentialities of a two-color Surface Plasmon Resonance (SPR) spectroscopy nanosizer by monitoring assembling colloidal dispersion citrate stabilized gold nanoparticles (AuNPs) on SiO2 surface. When AuNPs/water composite's optical density layer is negligible and electron mean-free path limitation taken into account in AuNPs' dielectric constant;s formulation, surface σ nanoparticle array statistical mean size <r> can be straightly determined using SPR context Maxwell's Garnett...
S. A. Baker, M. Bi, R. Q. Aucelio, B. W. Smith and J. D. Winefordner, Anal. At. Spectrom., 1999, 14, 19 DOI: 10.1039/A804060E