Rodrigo Jose de Oliveira

Rodrigo Jose de Oliveira
Universidade Estadual da Paraíba | UEPB · Departamento de Química

DSc in Chemistry

About

19
Publications
3,416
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220
Citations
Introduction
Associate Professor of Chemistry at the State University of Paraíba, Brazil, actually temporary researcher at the Istituto Italiano di Tecnologia, interested in photochemical synthesis of nanomaterials in association colloids. Dielectric relaxation spectroscopy studies of solid materials and nanocomposites are part of my research too. Novel materials for agricultural applications, as controlled released fertilizers, also communicates with the main research line of Chemistry of Novel Materials.
Additional affiliations
October 2012 - present
Universidade Estadual da Paraíba
Position
  • New hydrogels for controlled release of fertilizers and humidity retention in soil
October 2012 - present
Universidade Estadual da Paraíba
Position
  • Aqueous inorganic hydrogels as templates to make semiconducting polymeric nanofoams
August 2012 - present
Universidade Estadual da Paraíba
Position
  • Photoreactive surfactants for thermoelectrics.
Education
August 2008 - February 2012
Federal University of Pernambuco
Field of study
  • Chemistry

Publications

Publications (19)
Chapter
With the advent of industrial activities, various organic materials such as plastics from petroleum are an inevitable part of our daily needs. The properties of these depend on the chemical structure and, therefore, additives are used to obtain superior properties and make them more attractive, and consequently nondegradable and dangerous to health...
Article
Full-text available
Plastics are ubiquitous in our society and are used in many industries, such as packaging, electronics, the automotive industry, and medical and health sectors, and plastic waste is among the types of waste of higher environmental concern. The increase in the amount of plastic waste produced daily has increased environmental problems, such as pollu...
Article
Nanotechnology has emerged as a promising field in the development and modification of new nanostructured materials for multifaceted applications, including environmental remediation. Nanoparticles based trendy materials as robust adsorbents and efficient catalytic constructs offer unique structural, chemical, and multifunctional properties, such a...
Article
Phosphates are well known as dispersants for a variety of colloidal particles. Here however we use rheological measurements to show that high molecular weight polyphosphates (PP) can instead act as a flocculant for Laponite clay platelets. The proposed mechanism is bridging of PP between clay particle edges, leading to highly charged clusters formi...
Article
Full-text available
The disposal of industrial wastewater into aquatic bodies without proper treatment can cause severe damage to the environment and human health. The objective of this study was to perform the drying of the sweet orange (Citrus sinensis L. Osbeck) peel cultivar Pêra and evaluate the viability of its use as biosorbent in the removal of a direct dye. D...
Article
The objective of this work was to develop chitosan films incorporated with the eggshell membrane powder (MCO) by the solvent evaporation method with application perspective as curatives. Chitosan was obtained from the deacetylation of chitin extracted from shrimp shells of Litopenaeus vannamei Boone, and the membranes were manually extracted from c...
Article
The development of self-healing materials opens perspectives to fabricate devices with unprecedented lifetimes and recyclability that can be integrated with flexible electronics. However, the timescale at which these materials operate remains an important challenge to overcome. This article describes the fast self-healing behavior of aluminum/iron...
Article
Plastic debris is a major environmental concern, and to find effective ways to reuse polystyrene (PS) presents major challenges. Here it is demonstrated that polystyrene foams impregnated with SnO2 are easily generated from plastic debris, and can be applied to photocatalytic degradation of dyes. SnO2 nanoparticles were synthesized by a polymeric p...
Article
Full-text available
In this study, we present a new method for obtaining an effective catalytic system composed of glass, with Cu or CuO nanoparticle growth on a glass matrix through bottom-up process. The system is based on active borophosphate glass material doped with $$backslashhbox Cu^+$$ Cu + ions, which was obtained by a classical melt-quenching glass productio...
Article
Full-text available
In this work, we report a low-cost USB photometer development based on Arduino board, an open- source physical computing platform based on a simple microcontroller board. The USB photometer was tested on the methylene blue (MB) reduction by sodium borohydride catalyzed by AgNPs/glass nanocomposite. The AgNPs/glass nanocomposite was obtained by ther...
Article
Polyaniline (PAni) and magnetite (Fe3O4) are well-known semiconducting materials with quite different conduction mechanisms: localized conductivity for magnetite and long-range conductivity for PAni. Fe3O4 nanoparticles were used to polymerize aniline, forming a PAni/Fe3O4 hybrid nanocomposite. The microstructural evolution and the electrical behav...
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Full-text available
Dicationic magnetic ionic liquids with heteroanionic anions allow for tunability of physicochemical properties while retaining magnetic susceptibility.
Article
Full-text available
We investigated the nonlinear response of Co3O4 nanoparticles (NPs) dissolved in liquid n-heptane. The third- and fifth-order susceptibilities were measured using the Z-scan technique in experiments made with the second harmonic of an Nd: YAG laser (532 nm, 80 ps, 7 Hz). The nonlinear optical response of the colloidal system and its dependence with...
Article
A new class of photoreactive surfactants (PRSs) is presented here, consisting of amphiphiles that can also act as reagents in photochemical reactions. An example PRS is cobalt 2-ethylhexanoate (Co(EH)(2)), which forms reverse micelles (RMs) in a hydrocarbon solvent, as well as mixed reversed micelles with the standard surfactant Aerosol-OT (AOT). S...
Article
Full-text available
In this work we report a new and straightforward method to prepare the polyaniline-magnetite nanocomposite PANI-Fe3O4. The method utilizes Fe3O4 nanoparticles as the oxidizing agent assisted by UV light to synthesize PANI-Fe3O4 magnetic nanocomposite. FTIR and XRD analyses confirm that polyaniline has been obtained in the emeraldine salt form and t...
Article
Environmentally friendly electrochemical capacitors (ECs) were assembled using hybrid materials formed by a polyphosphate gel matrix in which carbon-based materials were inserted and polyaniline were formed in a single-step synthesis. The hybrid materials were deposited on FTO glasses and symmetric ECs were assembled using a cellulose membrane soak...

Questions

Question (1)
Question
I can see, to the best of my knowledge, that Dielectric Relaxation Spectroscopy - DRS - (for some, Impedance Spectroscopy) data is well stressed for reverse micelles or microemulsions at higher frequencies, above MHz range, and very few papers deal with below MHz range experiments. If the electrode or interfacial polarization is a problem I guess there are some methods to remove this effect from the data or even from the measurement, like highly porous electrodes. Then I wonder, is that a still open area of research? Or is there some fundamental issues about using low frequencies to characterize static or dynamic properties of reverse micelles or microemulsions using DRS?

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Projects

Projects (2)
Project
The proposed approach is to apply the support material as a precursor, an active host material that is a source and reaction medium for nanoparticle growth. In this sense, phosphate-based glasses have a high potential because of their extraordinary capacity to dissolve metal oxides (e.g, Zn, Cu, Ag, Cr, Mo, Al), lower transition and processing temperatures than silicate glasses, and diffusion ability of copper or silver ions and nanoparticle growth at relatively low temperatures. The active borophosphate glass material is obtained by a classic melt-quenching technique. The thermal annealing of the doped glasses enables the ion diffusion and reduction under specific conditions and glass compositions. The bottom-up process allows the synthesis and immobilization of nanoparticles on the glass surface when the material is annealed.
Project
Control polyphosphate induced clay percolation in order to make new multifunctional materials.