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Search Results: 1 - 10 of 329966 matches for " Carla S. Riccardi "
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Study of Corrosion Resistance of Laser Welded Au-Pd-Ag-In Alloy Using Electrochemical Techniques  [PDF]
Márcio L. Dos Santos, Heloísa A. Acciari, Carla S. Riccardi, Antonio C. Guastaldi
Materials Sciences and Applications (MSA) , 2011, DOI: 10.4236/msa.2011.27098
Abstract: The aim of this work was to evaluate the corrosion resistance of AuPdAgIn alloy, submitted to laser beam welding, in 0.9% NaCl solution, using electrochemical techniques. Measures of the open circuit potential (OCP) versus time were applied to electrochemical experiments, as well as potentiodynamic direct scanning (PDS) and electrochemical impedance spectroscopy (EIS) on AuPdAgIn alloy, submitted to laser beam welding in 0.9% NaCl solution. Some differences observed in the microstructure can explain the results obtained for corrosion potential, Ecorr, and corrosion resistance, Rp. EIS spectra have been characterized by distorted capacitive components, presenting linear impedance at low frequencies, including a non-uniform diffusion. The area of the laser weld presented corrosion potential slightly superior when compared to the one of the base metal. The impedance results suggest the best resistant corrosion behavior for laser weld than base metal region. This welding process is a promising alternative to dental prostheses casting.
Strategies for developing NADH detector based on meldola blue in different immobilization methods: a comparative study
Mariotti, Marcela P.;Riccardi, Carla dos S.;Fertonani, Fernando L.;Yamanaka, Hideko;
Journal of the Brazilian Chemical Society , 2006, DOI: 10.1590/S0103-50532006000400009
Abstract: a comparative study was accomplished between two immobilization methodologies for the meldola's blue (mb), used to decrease the oxidation potential of nadh. the study was performed with glassy carbon electrode by electropolymerization of pyrrole and mb through the technique of cyclic voltammetry being evaluated the effect of the number of cycles to define the thickness and the stability of the film. with 25 cycles it was obtained the best result. they were also investigated the modification of the graphite electrode with film formed by the system sol-gel ppo 300 or ppo 4000 for the dip-coating, through two methods: occlusion and adsorption. the best method was it of adsorption of mb during 10 min, following by deposit of the film ppo 300, favored for the time of drying (24 hours). the adsorption of mb followed by ppo 300 deposition presented broader linear range than ppy methodology.
Optimization of an amperometric biosensor for the detection of hepatitis C virus using fractional factorial designs
Uliana, Carolina V.;Riccardi, Carla S.;Tognolli, Jo?o O.;Yamanaka, Hideko;
Journal of the Brazilian Chemical Society , 2008, DOI: 10.1590/S0103-50532008000400024
Abstract: fractional factorial design and factorial with center point design were applied to the development of an amperometric biosensor for the detection of the hepatitis c virus. biomolecules were immobilized by adsorption on graphite electrodes modified with siloxane-poly(propyleneoxide) hybrid matrix prepared using the sol-gel method. several parameters were optimized, such as the streptavidin concentration at 0.01 mg ml-1 and 1.0% bovine serum albumin, the incubation time of the electrodes in the complementary dna solution for 30 minutes and a 1:1500 dilution of the avidin-peroxidase conjugate, among others. the application of chemometric studies has been efficient, since the best conditions have been established with a restricted number of experiments, indicating the influence of different factors on the system.
Effect of oxidizing and reducing atmospheres on Ba(Ti0.90Zr0.10)O3:2V ceramics as characterized by piezoresponse force microscopy
Francisco Moura,Alexandre Z. Sim?es,Carla S. Riccardi,Maria A. Zaghet
Processing and Application of Ceramics , 2011,
Abstract: The effect of annealing atmospheres (At amb, N2 and O2) on the electrical properties of Ba(Ti0.90Zr0.10)O3:2V (BZT10:2V) ceramics obtained by the mixed oxide method was investigated. X-ray photoelectron spectroscopy (XPS) analysis indicates that oxygen vacancies present near Zr and Ti ions reduce ferroelectric properties, especially in samples treated in an ambient atmosphere (At amb). BZT10:2V ceramics sintered in a nitrogen atmosphere showed better dielectric behaviour at room temperature with a dielectric permittivity measured at a frequency of 10 kHz equal to 16800 with dielectric loss of 0.023. Piezoelectric force microscopy (PFM) images reveal improvement in the piezoelectric coefficient by sintering the sample under nitrogen atmosphere. Thus, BZT10:2V ceramics sintered under a nitrogen atmosphere can be useful for practical applications which include nonvolatile digital memories, spintronics and data-storage media.
Preparation and evaluation of atrazine immunoconjugate
Riccardi, Carla dos Santos;Araújo, ?ngela Regina;Yamanaka, Hideko;
Eclética Química , 2002, DOI: 10.1590/S0100-46702002000200003
Abstract: in order to study the affinity reaction between the anti-atrazine antibody and atrazine, an enzyme was incorporated, as a marker, to an atrazine carboxylic derivative. the hapten and conjugate were synthesized and characterized by ms, ir and nmr. the interaction between monoclonal antibodies and hapten-hrp conjugate was investigated by enzyme linked immunosorbent assay (elisa).
Imunossensor amperométrico
Riccardi, Carla dos Santos;Costa, Paulo Inácio da;Yamanaka, Hideko;
Química Nova , 2002, DOI: 10.1590/S0100-40422002000200020
Abstract: the reaction between antigen and antibody has been widely used in many strategies for the development of analytical methodology, due to its high specificity. the immuno-reaction has been successfully employed for the biosensor development. a focus on biosensor based on immunoassay coupled to amperometric transducer is presented.
Imunossensor amperométrico
Riccardi Carla dos Santos,Costa Paulo Inácio da,Yamanaka Hideko
Química Nova , 2002,
Abstract: The reaction between antigen and antibody has been widely used in many strategies for the development of analytical methodology, due to its high specificity. The immuno-reaction has been successfully employed for the biosensor development. A focus on biosensor based on immunoassay coupled to amperometric transducer is presented.
Dielectric Spectroscopy Analyses of SrBi4Ti4O15 Films Obtained from Soft Chemical Solution
A. Z. Sim es,C. S. Riccardi
Advances in Materials Science and Engineering , 2009, DOI: 10.1155/2009/928545
Abstract: SrBi4Ti4O15 (SBTi) thin films were deposited by the polymeric precursor method on Pt bottom electrodes. The obtained films were characterized by X-ray diffraction, scanning electron microscopy, Raman spectroscopy, and dielectric spectroscopy analyses. The capacitance-voltage (-) characteristics of perovskite thin film showed normal ferroelectric behavior. The remanent polarization and coercive fields were 5.4 C/cm2 and 85 kV/cm, respectively. Dielectric spectroscopy was employed to examine the polycrystalline behavior of ferroelectric material and the mechanisms responsible for the dielectric performance of the thin film.
Estudo do comportamento eletroquímico da enzima peroxidase na presen?a de peróxido de hidrogênio e ácido 5-aminossalicílico
Uliana, C. V.;Riccardi, C. S;Yamanaka, H.;
Eclética Química , 2008, DOI: 10.1590/S0100-46702008000100008
Abstract: the electrochemical behavior of the enzyme peroxidase (hrp) was investigated using the hydrogen peroxide as enzymatic substrate and the 5-aminosalicylic acid (5-asa) as mediator of electrons on graphite electrodes. several parameters were optimized, namely, the applied potential to the amperometric technique fixed in -0.125v, the 0.1 mol l-1 phosphate-citrate buffer at ph 5.0 as supporting electrolyte and the proportion between the 5-asa and h2o2 in 1:7, among others. it was observed the catalysis of the oxidation reaction of the h2o2 in the presence of the enzyme hrp and 5-asa. the oxidation product was reduced in the electrode surface, evidencing a significant increase in the intensity of the cathodic current.
Severe reaction in a child with asymptomatic codfish allergy: Food challenge reactivating recurrent pancreatitis
Katia Pellegrino, Leila Emma D’Urbano, Maria Cristina Artesani, Carla Riccardi, Sandro Mancini, Sergio Bella, Federico Alghisi, Giovanni Cavagni
Italian Journal of Pediatrics , 2012, DOI: 10.1186/1824-7288-38-16
Abstract:
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