RSS 1.0Departamento de Físico Química
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Activation of Mo and V oxides supported on ZSM-5 zeolite catalysts followed by in situ XAS and XRD and their uses in oxydehydration of glycerol
Possato, Luiz G.
; ; ; ; Passos, Aline R. ; Pulcinelli, Sandra H. ; Santilli, Celso V. ; Martins, Leandro (Molecular Catalysis, 2018) [Artigo]
This paper describes the activation and catalytic performance of a multifunctional catalyst consisting of mixed oxides of vanadium and molybdenum supported on an acidic ZSM-5 zeolite. The zeolite was wet-impregnated with ... -
Reagentless Detection of Low-Molecular-Weight Triamterene Using Self-Doped TiO2 Nanotubes
Hudari, Felipe F.; Bessegato, Guilherme G. ; Bedatty Fernandes, Flávio C. ; Zanoni, Maria V. B. ; Bueno, Paulo R. (Analytical Chemistry, 2018) [Artigo]
TiO2 nanotube electrodes were self-doped by electrochemical cathodic polarization, potentially converting Ti4+ into Ti3+, and thereby increasing both the normalized conductance and capacitance of the electrodes. One-hundred ... -
Highly Controlled Diffusion Drug Release from Ureasil-Poly(ethylene oxide)-Na+-Montmorillonite Hybrid Hydrogel Nanocomposites
Jesus, Celso R.N.; ; Pulcinelli, Sandra H. ; Santilli, Celso V. (ACS Applied Materials and Interfaces, 2018) [Artigo]
In this work, we report the effects of incorporation of variable amounts (1-20 wt %) of sodium montmorillonite (MMT) into a siloxane-poly(ethylene oxide) hybrid hydrogel prepared by the sol-gel route. The aim was to control ... -
Surfactant-assisted synthesis of Mo-V mixed oxide catalysts for upgraded one-step conversion of glycerol to acrylic acid
Rasteiro, Letícia F.; Vieira, Luiz H. ; Santilli, Celso V. ; Martins, Leandro (RSC Advances, 2018) [Artigo]
The catalytic properties of Mo-V mixed oxides hydrothermally synthetized in the presence of ionic surfactants (SDS and CTAB) were investigated in the gas-phase oxidative dehydration of glycerol. The presence of surfactants ... -
Studies on dispersion and reactivity of vanadium oxides deposited on lamellar ferrierite zeolites for condensation of glycerol into bulky products
Vieira, Luiz H.; Possato, Luiz G. ; Chaves, Thiago F. ; Pulcinelli, Sandra H. ; Santilli, Celso V. ; Martins, Leandro (Molecular Catalysis, 2018) [Artigo]
The acetalization of acetone with glycerol was investigated using vanadium-impregnated catalysts. The siliceous supports FER, a purely microporous material, and ITQ-6, a micro/mesoporous material, were obtained from a ... -
Nanbo3/pvdf composite: A flexible functional material
Teixeira, G. F.; Ciola, R. A. ; Zaghete, M. A. ; Varela, J. A. ; Longo, E. (Ceramic Engineering and Science Proceedings, 2017) [Trabalho apresentado em evento]
Sodium niobate can be used as precursor of flexible composites with great properties aiming the use in devices that combine properties like piezoelectricity and photoluminescence. In this work, we obtained NaNbO3 fiber-like ... -
Corrosion behavior of WC-Co coatings deposited by cold gas spray onto AA 7075-T6
da Silva, F. S.; ; ; ; ; ; Benedetti, A. V. (Corrosion Science, 2018) [Artigo]
This work reports a morphological, mechanical, and corrosion resistance characterization of WC-12Co and WC-25Co coatings deposited by cold gas spray (CGS) onto AA 7075-T6 alloy. Cross-sectional images of the coatings ... -
Redox Capacitive Assaying of C-Reactive Protein at a Peptide Supported Aptamer Interface
Piccoli, Julia; ; ; ; Cilli, Eduardo M. ; Bueno, Paulo R. ; (Analytical Chemistry, 2018) [Artigo]
Electrochemical immunosensors offer much in the potential translation of a lab based sensing capability to a useful real world platform. In previous work we have introduced an impedance-derived electrochemical capacitance ... -
Catalytic performance of texturally improved Al-Mg mixed oxides derived from emulsion-synthesized hydrotalcites
Petrolini, Davi D.; ; ; Pulcinelli, Sandra H. ; Santilli, Celso V. ; Martins, Leandro (RSC Advances, 2018) [Artigo]
Mixed oxides of aluminum and magnesium derived from hydrotalcites were prepared by means of a sol-gel method mediated by an emulsified sol as pore template. The emulsion consisted of ethanol as the continuous phase and ... -
Structure and properties of epoxy-siloxane-silica nanocomposite coatings for corrosion protection
Torrico, Ruben F.A.O.; Harb, Samarah V. ; Trentin, Andressa ; Uvida, Mayara C. ; Pulcinelli, Sandra H. ; Santilli, Celso V. ; Hammer, Peter (Journal of Colloid and Interface Science, 2018) [Artigo]
Hypothesis The fraction of the silica/siloxane phase is a crucial parameter, which determines the structure and thus the properties of epoxy-siloxane-silica hybrid coatings. A careful adjustment of the colloidal precursor ... -
Revisiting the ZnO Q-dot formation toward an integrated growth model: From coupled time resolved UV-Vis/SAXS/XAS data to multivariate analysis
Caetano, Bruno L.; ; Pulcinelli, Sandra H. ; ; Santilli, Celso V. (Journal of Physical Chemistry C, 2017) [Artigo]
Herein we discuss in depth the mechanisms of growth of ZnO quantum dots prepared from zinc oxyacetate ethanolic solutions by LiOH addition. The nucleation, growth and aggregation of ZnO nanocrystals were unambiguously ... -
Pulse electrodeposition of CoFe thin films covered with layered double hydroxides as a fast route to prepare enhanced catalysts for oxygen evolution reaction
Sakita, Alan M.P.; ; ; Benedetti, Assis V. (Applied Surface Science, 2018) [Artigo]
A novel, ultra-fast, and one-step method for obtaining an effective catalyst for oxygen evolution reaction is proposed. The procedure consists in direct electrodeposition, in a free-nitrate bath, of CoFe alloy films covered ... -
Quantum capacitance as a reagentless molecular sensing element
Bueno, Paulo R.; Bedatty Fernandes, Flávio C. ; (Nanoscale, 2017) [Artigo]
The application of nanoscale capacitance as a transduction of molecular recognition relevant to molecular diagnostics is demonstrated. The energy-related signal relates directly to the electron occupation of quantized ... -
Preparation and characterization of a red luminescent composite composed of an EVA copolymer and a Y3BO6:Eu3+ phosphor
; ; ; ; ; ; Henrique Cassinelli, Wellington; Santilli, Celso Valentim ; (New Journal of Chemistry, 2017) [Artigo]
This work describes the preparation of red luminescent composites based on an ethylene/vinyl acetate (EVA) copolymer filled with a Y3BO6:Eu3+ phosphor powder. Luminescent powders were synthesized using a method derived ... -
Morphology of the spermathecae of twelve species of Triatominae (Hemiptera, Reduviidae) vectors of Chagas disease
; ; Almeida, Larissa Aguiar; de Oliveira, Jader ; Mendonça, Vagner José ; Cilense, Mário ; da Rosa, João Aristeu (Acta Tropica, 2017) [Artigo]
Trypanosoma cruzi, the etiological agent of Chagas disease, is transmitted by triatomines that have been described in a large number of studies. Most of those studies are related to external morphology and taxonomy, but ... -
EIS studies of chalcopyrite involving iron(II) ions
Delfino, Fabiana Antonia Arena; Bevilaqua, Denise ; Benedetti, Assis Vicente (Solid State Phenomena, 2017) [Trabalho apresentado em evento]
In this work, we present an Electrochemical Impedance Spectroscopy (EIS) study using a carbon paste electrode modified with chalcopyrite (CuFeS2) containing 50 wt% of the mineral (particle size < 38 μm) and graphite (particle ... -
Correlation of Sol–Gel Alumina-Supported Cobalt Catalyst Processing to Cobalt Speciation, Ethanol Steam Reforming Activity, and Stability
Passos, Aline R.; Martins, Leandro ; Pulcinelli, Sandra H. ; Santilli, Celso V. ; (ChemCatChem, 2017) [Artigo]
The effect of sol–gel alumina characteristics on the supported Co catalyst properties was investigated at the different steps of catalyst preparation. Porous alumina with variable surface reactivity were prepared from the ... -
The multiple benefits of glycerol conversion to acrolein and acrylic acid catalyzed by vanadium oxides supported on micro-mesoporous MFI zeolites
Possato, Luiz G.; Chaves, Thiago F. ; Cassinelli, Wellington H. ; Pulcinelli, Sandra H. ; Santilli, Celso V. ; Martins, Leandro (Catalysis Today, 2017) [Artigo]
The ZSM-5 zeolite (MFI structure, Si/Al = 40) was treated using NaOH and either oxalic acid or HCl to obtain hierarchical materials with different characteristics, followed by impregnation with vanadium oxides (V2O5) to ... -
Semi-integrative Voltammetry as an Efficient Tool to Study Simple Electrochemical Systems in Deep Eutectic Solvents
Perdizio Sakita, Alan M.; ; Fugivara, Cecílio S. ; Benedetti, Assis V. (Analytical Chemistry, 2017) [Artigo]
The utilization of deep eutectic solvents (DESs) in electrochemical studies has grown in recent years due to their low cost and environmental friendliness compared to traditional ionic liquids. However, the determination ... -
Conceptual density functional theory for electron transfer and transport in mesoscopic systems
Bueno, Paulo R.; (Physical Chemistry Chemical Physics, 2017) [Artigo]
Molecular and supramolecular systems are essentially mesoscopic in character. The electron self-exchange, in the case of energy fluctuations, or electron transfer/transport, in the case of the presence of an externally ...