A5059161924- Conducting polymers and applications
- Analytical Chemistry and Sensors
- Electrochemical sensors and biosensors
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Gold and Silver Nanoparticles Synthesis and Applications
- Organic Electronics and Photovoltaics
- Mesoporous Materials and Catalysis
- Advanced Sensor and Energy Harvesting Materials
- Spectroscopy and Chemometric Analyses
- Biosensors and Analytical Detection
- Adsorption and biosorption for pollutant removal
- Clay minerals and soil interactions
- Electrochemical Analysis and Applications
- biodegradable polymer synthesis and properties
- Analytical chemistry methods development
- Radioactive element chemistry and processing
- Surfactants and Colloidal Systems
- Meat and Animal Product Quality
- Polymer Nanocomposites and Properties
- Lanthanide and Transition Metal Complexes
- Advanced biosensing and bioanalysis techniques
- Layered Double Hydroxides Synthesis and Applications
- Magnetism in coordination complexes
- Pesticide Residue Analysis and Safety
Universidade Federal de Juiz de Fora
2014-2024
GS Yuasa (Japan)
2023
Artemis (United States)
2022
National Council for Scientific and Technological Development
2022
Centro de Ensino Superior de Juiz de Fora
2017-2020
Universidade de São Paulo
2002-2016
Universidade Federal de São Carlos
2012
University of Victoria
2011
Tohoku University
2001
Tokyo University of Science
1993
Emerging strategies for assembling inorganic nanoparticles into ensembles with multiscale organization are establishing a new paradigm the synthesis of devices and functional materials applications ranging from drug delivery to photonics. In this work, solution self-assembly amphiphilic ionic block copolymers morphologically tunable aggregates provides inspiration design strategy nanoparticle building blocks essential chemical conformational features copolymer chains in aqueous media. We...
In this study, a new and efficient analytical method was developed to determine hexavalent chromium, Cr (VI), in water by flame atomic absorption spectrometry (FAAS). This consists on the simultaneous selective extraction preconcentration of (VI) dispersive solid phase (DSPE), using Zn-Al layered double hydroxide intercalated with l-Alanine (ZnAl-ALA-LDH) as adsorbent. Experimental parameters that influence (IV) determination efficiency, such pH, time interfering ions were studied optimized....
The interaction of emeraldine base polyaniline (EB) with Cu(II), Fe(III), and Zn(II) in 1-methyl-2-pyrrolidinone (NMP) solution was monitored using electronic UV−vis−NIR, resonance Raman, electron paramagnetic (EPR) spectroscopies. films prepared from these solutions were also spectroscopically characterized. It demonstrated that the nature products (semiquinone quinone segments) formed EB metal ions is strongly dependent on cation, metal/EB molar ratio, concentration components. presence...
Nanocompósitos à base de amido mandioca, argila sintética hectorita e açúcar invertido (plastificante) foram preparados por processo em meio aquoso (casting) produzindo filmes transparentes homogêneos.Pequenas quantidades (5-15% massa) produzem principalmente nanocompósitos esfoliados, enquanto grandes (30% promovem a formação intercalados.Os espectros FT-Raman mostram que bandas sensíveis ligação hidrogênio grânulos são progressivamente deslocadas para frequências menores quando o teor é...
This work deals with the spectroscopic (supported by quantum chemistry calculations), structural, and morphological characterization of mefenamic acid (2-[(2,3-(dimethylphenyl)amino] benzoic acid) polymorphs, known as forms I II. Polymorph was obtained recrystallization in ethanol, while form II reached heating up to 175 °C, promote solid phase transition. Experimental theoretical vibrational band assignments were performed considering presence centrosymmetric dimers. Besides shifts...
This work emphasizes the important role of synthetic parameters in structure polymeric material obtained aniline polymerization. The polymers formed by oxidative polymerization copper(II) ions acidic aqueous solution, acetonitrile/water medium, and also acetate complex encapsulated into MCM-41 molecular sieve were characterized resonance Raman spectroscopy using three exciting laser lines other techniques such as UV−vis, FTIR, XANES (Nitrogen K edge). Additionally products investigated...
Abstract Hybrid materials were prepared by combining clay mineral (montmorillonite SWy‐2 and saponite SapCa‐1) dyes extracted from the açaí ( Euterpe oleracea Mart. ) fruit, which contains mainly anthocyanins 3‐glucoside class, to increase stability of dye facilitate its handling storage. Clay minerals are common ingredients in therapeutic pharmaceutical products phytochemicals show disease prevention properties. The extract fruit was mixed with water suspensions layered silicates different...
The purpose of this study is to investigate the chemical interaction between carboxyl-functionalized single-walled carbon nanotubes (SWNTs) and multi-walled (MWNTs) with in situ chemically polymerized polypyrrole (PPy) films (approximately 8 nm) by resonance Raman spectroscopy. composites (SWNT/PPy MWNT/PPy) were synthesized using nitric acid functionalized as starting material. resulting characterized transmission electronic microscopy (TEM) spectroscopy (λexc. = 514.5, 632.8, 785 nm). TEM...
The interaction of emeraldine base (PANI-EB) with silver and gold colloids was probed by using Surface-Enhanced Resonance Raman Scattering (SERRS) at 3 different exciting radiations. Due to the great sensitivity SERRS technique detection limit PANI-EB concentration ca. 2 x 10(-7) mol L(-1) in Ag Au colloidal suspensions. UV-vis-NIR spectra metal function concentrations showed that present a higher degree aggregation than colloids. on allowed study polymeric species formed primarily metallic...
A biosensor was developed for directly detecting human immunoglobulin G (IgG) and adenosine triphosphate (ATP) based on stable reproducible gold nanoparticles/polystyrene-b-poly(2-vinylpyridine) (AuNP/PS-b-P2VP) nanocomposites. The substrates were functionalized with carboxylic acid groups the covalent binding of anti-IgG anti-ATP detection IgG ATP (1 to 150 μg/mL). SEM images nanocomposite show 17 ± 2 nm AuNP clusters adsorbed over a continuous porous PS-b-P2VP thin film. UV-VIS SERS used...
Poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS) synthesis was monitored by resonance Raman (RR) and surface-enhanced scattering (SERRS) spectroscopies both the oxidation of polymer effects chain length were assessed vibrational analysis.It supported theoretical models oligomers, with charge ranging from 0 to +6 size varying 2 16 3,4-ethylenedioxythiophene (EDOT) repeat units, described through density functional theory.The symmetric C α β stretching band observed at ca....
An analytical method for extraction and preconcentration of Cr(<sc>vi</sc>) in water with DSPE using a Zn–Al LDH intercalated <sc>l</sc>-aspartic acid as dissolvable adsorbent.
In this work, a carbon replica derived from vinylbenzenesulfonate-intercalated layered double hydroxide (CR-LDH) was applied to remove the Dicamba organochlorine herbicide aqueous solution. The samples were characterized by several experimental techniques such as X-ray diffraction (XRD), thermogravimetric analysis coupled with differential scanning calorimetry and mass spectrometry (TGA-DSC-MS), photoelectron spectroscopy (XPS), electron microscopy (SEM), Raman spectroscopy, N2...