Corrigendum to “Magnetoelectric coupling in Fe3O4/P(VDF-TrFE) nanocomposites” (Sens. Actuators A 247 (2016) 298–306) (S0924424716302989)(10.1016/j.sna.2016.06.013)

The author regrets that one of the authors name “Fouad BELHOURA” has been mistaken and shall be corrected and changed to “Fouad BELHORA”.The author would like to apologise for any inconvenience caused.International audienceNanocomposite films composed of nanoparticles Fe3O4embedded in copolymers of vinylidene fluorideand trifluoroethylene P(VDF-TrFE) (70/30) have been elaborated. The effect of Fe3O4content on thecristallinity ratio, dielectric and magnetoelectric properties of the nano-piezo-composites was studiedand discussed. Dielectric characterization showed an increase of the permittivity and a decrease of theresistivity with the increasing ratio of nanofillers. Thermal analysis revealed a decrease of the cristallinityof the composite. Poling process was found to be difficult for Fe3O4contents higher than 1%, because ofthe low breakdown fields and diminished resistivity with increasing Fe3O4content. As a consequence,magnetoelectricmeasurementswereconductedonlyonnanocompositeswithFe3O4contentslowerthan0.5% in the case of poled samples. The optimal value of the first order magnetoelectric (ME) coefficient ̨pwas obtained for a nanoparticles content of 0.3% wt

Optimization and improvement of thermal energy harvesting by using pyroelectric materials

cited By 2International audienceWe deal with the thermal energy which is one of the ambient energy sources surely exploitable, but it has not been much interest as the mechanical energy. In this paper, our aim is to use thermal energy and show that it's an important source for producing the electrical energy through pyroelectric effect which is the property of some dielectric materials to show a spontaneous electrical polarization versus temperature. In this context, we present a concept to harvest a thermal energy using infrared rays and pyroelectric effect. The pyroelectric material used in this work can generate an electrical voltage when it subjected to a temperature change which will be ensured by the use of infrared lamp. Our experimental results show that the electrical voltage, current and harvested power increased significantly when increasing the area of the pyroelectric element. The experimental results show also that with this simple concept we harvested a heavy amount value of power which will certainly be useful in an extensive range of applications, including sensors and infrared detection. These results shed light on the thermoelectric energy conversion by Ceramic lead zirconate titanate (PZT) buzzer having the pyroelectric property. © 2016 Elsevier B.V. All rights reserved

Energy harvesting using hybridization of dielectric nanocomposites and electrets

cited By 6International audienceElectrostrictive polymers have been investigated as electroactive materials for electromechanical energy harvesting. This kind of material is isotope, i.e. there is no permanent polarization compared with piezoelectric material, so in order to ensure its polarization and scavenging energy, the electrostrictive polymers need necessarily an application of a static field. To avoid this problem, we used the hybridization of electrostrictive polymer with electret. The present work aims an analytical modeling for predicting the power convert when the material was mechanically excited. The study was carried out on polyurethane and terpolymer [P(VDF-TrFE-CFE)] films, either without filler or filled with carbon nanopowder. Experimental measurements of the harvested power showed a good agreement with the theoretical behavior predicted by the proposed model. It was also shown that the incorporation of nanofillers increased the power harvested from 5.22·10-2 to 1.498·10-1μWcm-3 and from 6.87·10-1 to 1.76μWcm-3 in polyurethane and in the terpolymer, respectively. © 2015 John Wiley & Sons, Ltd

A new concept to harvest thermal energy using pyroeletric effect and Rayleigh-Benard convections

cited By 1International audienceThermal energy is one of the ambient energy sources surely exploitable but it has not drawn as much interest as mechanical energy. Our work aims to use thermal energy and to show that it is an important source for producing electrical energy using the pyroelectric effect. More precisely, we present in this paper a new concept to harvest thermal energy using the pyroelectric effect and Rayleigh-Benard convections. In fact, the convections will be created inside an oil bath, which can keep the pyroelectric element under temperature fluctuations (heating and cooling), making it possible to generate voltage by the pyroelectric effect. Our experimental findings show that with this original concept, based on Rayleigh-Benard convections, we harvested 0.28mW; this value was also improved by using the SSHI technique, which allows us to increase it up to 0.55mW. This obtained value of power is a heavy amount, which will certainly be useful in an extensive range of applications, including sensors and infrared detection. These results shed light on the thermoelectric energy conversion by PZT ceramic buzzer having the pyroelectric property, using a constant heat source. © 2016, Società Italiana di Fisica and Springer-Verlag Berlin Heidelberg

Enhanced magnetoelectric effect for flexible current sensor applications

cited By 13International audienceThis article focuses on the magnetoelectric (ME) effect that could be obtained in a bilayered structure consisting of the Cytop polymer and a magnetic tape filled with magnetically soft particles. The ME behavior was characterized by measuring the amplitude of the magnetoelectric current versus various input parameters that appear in theoretical expressions, i.e., the bias magnetic field, the alternative magnetic field, and the applied frequency. Experimental results were investigated together with theoretical models in order to determine the ME coupling value. It was found that the laminate material of a transversely charging electret along with bias magnetic tape could attain significant magnetoelectric properties, which were the result of the mechanical contacts between the layers and the electric-mechanical and magnetic-mechanical coupling in each phase. All the results demonstrated a possibility to realize a low-cost flexible current sensor while achieving an improved magnetoelectric response. © 2014 AIP Publishing LLC

PU/PZT composites for vibratory energy harvesting

cited By 3International audiencePiezoelectric composites of PU/PZT with 0–3 connectivity were prepared in the film form. Homogeneous dispersion of the ceramic PZT in polyurethane matrix has been obtained and has been verified by SEM analysis. Dielectric properties reveal that under an electrical field of 1000 V the remnant polarization increased from 1.9 to 4 µC/cm−2 when the volume fraction of PZT increased from 50 to 80 %. Modeling and vibratory energy harvesting tests has been realized. At very low frequency and deformation, and without application of any static electric field, 1.15 µW of power has been obtained. The results obtained in this work contribute to demonstrate the ability of the incorporation of PZT particles in the polymer matrix to improve the conversion efficiency of the vibratory energy into electrical energy for the development of µ-generators. © 2016, Springer Science+Business Media New York

Recent advances in magnesium hydride for solid-state hydrogen storage by mechanical treatment: A DFT study

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