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Flexible RF electronics and antennas made from textiles are regarded as a technology that accelerates the widespread popularity of modern wearable communication devices and components. This work presents a flexible and compact 4 1... more
Flexible RF electronics and antennas made from textiles are regarded as a technology that accelerates the widespread popularity of modern wearable communication devices and components. This work presents a flexible and compact 4 1 rectangular microstrip patch array antenna for radio frequency (RF) energy harvesting applications. It operates at 5 GHz and has a high gain. The proposed antenna incorporates the inset feed technique to improve impedance matching and employs a conductive fabric (E-textile) as a conductor, along with textile as a substrate. The feeding and radiating structures are designed by using stick E shield conductive textiles that possess a conductivity of 5 10 5 S/m and are 0.085 mm thick. This design relies entirely on textile materials to ensure the user's comfort, ease of production, and cost-effectiveness. The Ansys HFSS simulator, which employs the finite element method, was utilized to optimize the antenna design. Subsequently, the suggested configuration was verified using the CST MWS simulator, which utilizes the finite integration method. The study aimed to achieve high gain and robust performance from the designed antenna. The simulation results demonstrate excellent performance within the operating band, with an impedance bandwidth of 6.78% and a high gain of 14.54 dBi at 5 GHz, making it well-suited for radiofrequency (RF) energy harvesting and wearable device applications.
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This paper presents and compares films made using the solution casting method with a mixture of poly (vinylidene fluoride‐co‐hexafluoropropylene) (PVDF‐HFP), graphene oxide (GO), and lead zirconate titanate (PZT). The Hummers' method... more
This paper presents and compares films made using the solution casting method with a mixture of poly (vinylidene fluoride‐co‐hexafluoropropylene) (PVDF‐HFP), graphene oxide (GO), and lead zirconate titanate (PZT). The Hummers' method synthesized GO. Scanning electron microscopy (SEM), Fourier‐transform infrared spectroscopy (FTIR), X‐ray diffraction (XRD), differential scanning calorimetry (DSC), thermal gravimetric analysis (TGA), and tensile testing were realized. The developed composite films were found to have a coherent distribution of PZT and GO in PVDF‐HFP. After that, a gradual improvement, such as an increase in the quantity of β phase, produces high piezoelectric performance. Also, the PVDF‐HFP polymer's thermal stability improved. When 0.1 wt% of PZT/GO was added, the melting temperature increased from 140 to 143°C, and the crystallization temperature from 109 to 113°C. PVDF‐HFP elastic modulus and tensile strength were also considerably reduced as PZT/GO increase...
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Piezoelectric nanocomposites have attracted considerable attention from researchers during these last years for their wide use in the development of electromechanical microsystems (MEMS). In this paper, piezoelectric lead titanate... more
Piezoelectric nanocomposites have attracted considerable attention from researchers during these last years for their wide use in the development of electromechanical microsystems (MEMS). In this paper, piezoelectric lead titanate zirconate (PZT) are used with poly(vinylidene fluoride-hexafuoropropylene) (PVdF-HFP) polymer matrix to prepare the piezo thin nanocomposite film. An improvement in the β phase in PVdF-HFP was created by the reaction between the PZT nanoparticles and PVdF-HFP. The process used for the preparation of the film results in the enhancement of the ferroelectric and piezoelectric properties of PVdF-HFP. These polymer nanocomposite films were made by the solvent casting method under ultra-sonication using THF as a solvent, with different percentages of PZT. The results confirm that incorporating PZT nanoparticles in the PVDF-HFP matrix increases the β-phase fraction, enhancing the efficiency of energy harvesting.
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Radio Frequency Energy harvesting is an extremely important research subject, linked to sustainability, and could be a potential solution to conventional energy supplies. The main idea is to develop battery-free wireless sensors able to... more
Radio Frequency Energy harvesting is an extremely important research subject, linked to sustainability, and could be a potential solution to conventional energy supplies. The main idea is to develop battery-free wireless sensors able to capture the available energy into the mentioned bandwidth. In this paper, a 1.8–2.4 GHz wideband rectenna is designed for radio frequency (RF) energy harvesting in the context of wireless sensor nodes (WSN). For this purpose, the agilent Advanced Design System (ADS) was used. This article presents the design and simulation of a high output voltage rectifier. First, we designed a rectifier based on Metelics MSS20-141 Schottky diode using a series topology to convert electromagnetic energy into DC. Then, a low-pass filter was implemented to filter out undesirable harmonics generated by the non-linear Schottky diode. Simulation results show that load resistance, input frequency and input power are important parameters to evaluate the performances of RF ...
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By means of experimental tools, we have studied the effect of lead zirconate titanate volume fraction introduced in polyamide-6/lead zirconate titanate composites on dielectric, piezoelectric, mechanical, and structural properties. As the... more
By means of experimental tools, we have studied the effect of lead zirconate titanate volume fraction introduced in polyamide-6/lead zirconate titanate composites on dielectric, piezoelectric, mechanical, and structural properties. As the first result, we found that the insertion of lead zirconate titanate particles makes the dielectric permittivity of the polyamide-6 matrix increases from 10 to 95.8. The dielectric property studies reveal that under an electrical field of 1 kV the remnant polarization is also increased from 0.17 to 0.4, this behavior is related to both the increase of volume fraction of lead zirconate titanate from 20% to 40% and the piezoelectric coefficient changes proportionally with that of volume fraction of lead zirconate titanate. Furthermore, piezoelectric activity increases with lead zirconate titanate particle size at a range where there is a lower order of magnitude. Finally, the uniform dispersion of the ceramic lead zirconate titanate particles in poly...
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In the last few years, a lot of research focused on increasing of smart textiles products such as woven and knitted structures, which are able to show significant change in their mechanical properties (such as shape and stiffness), in a... more
In the last few years, a lot of research focused on increasing of smart textiles products such as woven and knitted structures, which are able to show significant change in their mechanical properties (such as shape and stiffness), in a practical way in response to the stimuli. In this paper, we investigate the potential of a flexible piezoelectric film stuck onto three woven textile matrices: cotton, polyester/cotton, and Kermel, for harvesting mechanical energy from the textile and converting it into electrical energy. At first, a brief introduction of energy harvesting using the piezoelectric material and smart textile is presented. Furthermore, a basic model showing the operation of polyvinylidene fluoride with 33 mode is established. The second part is focused on standard approach model of energy harvesting based on resistive load and freestanding piezo-polymer for the examination of the performance of 33-mode polyvinylidene fluoride energy harvester and the prediction of harve...
Research Interests: Materials Engineering, Mechanical Engineering, Aerospace Engineering, Materials Science, Chemistry, and 14 moreDesign, Composite Materials, Fabrics, Energy Harvesting, Smart Textiles, Power Generation, Walking, Cotton, System, Textile, Composite Material, Polyester, Technology and Engineering, and Piezoelectricity
Future enhancements in radio frequency (RF) energy harvesting technology will make easy the creation of a network with no need of dedicated transmitters, as a reliable source of wireless energy power. Recently, the development and... more
Future enhancements in radio frequency (RF) energy harvesting technology will make easy the creation of a network with no need of dedicated transmitters, as a reliable source of wireless energy power. Recently, the development and employment of wearable antennas has increased rapidly for application in the miniaturization of wireless communication devices. The principal feature of wearable antennas is that they are designed as garment elements able to transmit or receive wireless signals. In this context, we propose a design of a wearable textile microstrip patch antenna operating for wireless body area network (WBAN)at the resonance frequency =2.40GHz. The microstrip patch antenna with an edge feeding technique is designed and simulated by using the Keysight Advanced Design System (ADS) software. Textile materials have a low dielectric constant that reduces the surface wave losses and increases the impedance bandwidth of the antenna. The chosen dielectric substrate in this work is ...
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Energy harvesting is the most efficient way to meet energy demand while also supplying renewable energy sources from the environment. This technology consists of recovering of electrical energy from lost energy sources, which are... more
Energy harvesting is the most efficient way to meet energy demand while also supplying renewable energy sources from the environment. This technology consists of recovering of electrical energy from lost energy sources, which are available everywhere, including heat, fluids, vibrations, etc. In particular, energy harvesting via piezoelectric materials, which can convert the energy of vibrations and mechanical deformations into electrical energy, has been the subject in the last decade. This energy is used in a variety of applications, including energy collectors, sensors, and actuators, among others. This study concerns the improvement and enhancement of the properties of Poly (methyl methacrylate) (PMMA). Synthesized PMMA was blended with Poly(vinylidene fluoride-co-hexafluoropropylene) (PVdF-HFP), and Lead zirconate titanate (PZT) nanoparticles at various composition ratios using solvent casting technique in Tetrahydrofuran (THF). Improvement of properties has confirmed by POM, SE...
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Le concept de la récupération d'énergie se rapporte généralement au processus d'utilisation de l'énergie ambiante, qui est converti, principalement (mais pas exclusivement) en énergie électrique pour faire fonctionner des... more
Le concept de la récupération d'énergie se rapporte généralement au processus d'utilisation de l'énergie ambiante, qui est converti, principalement (mais pas exclusivement) en énergie électrique pour faire fonctionner des dispositifs électroniques petites et autonomes. Les tendances récentes à la fois dans l'industrie et au domaine de la recherche ont mis l'accent sur les polymères électro-actifs pour la conversion d'énergie électromécanique. Cet intérêt s'explique par de nombreux avantages tels que la productivité élevée, la grande flexibilité, et la facilité de traitement. Le but de ce travail de recherche est d’explorer la potentialité des polymères électro-actifs pour une application de récupération d’énergie mécanique ambiante. Dans la première partie, une synthèse des composites à base de polyuréthane (PU) et de P(VDF-TrFE-CFE) a été réalisée, suivie d’une caractérisation électrique et mécanique de ces polymères et composites afin d’évaluer leurs pa...
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In this paper, the performance of a semi-active control of structural vibrations which is the Synchronized Switch Damping on Inductor Max called SSDI-Max technique is improved. This improvement is achieved by adding a negative capacitance... more
In this paper, the performance of a semi-active control of structural vibrations which is the Synchronized Switch Damping on Inductor Max called SSDI-Max technique is improved. This improvement is achieved by adding a negative capacitance to the resonant circuit that dissipates the energy converted from the structure by the piezoelectric transducer. A model of system shunted to a resonant circuit, using the SSDI-MAX control and the negative capacitance, is analyzed analytically using Matlab/SIMULINK environment. The results show that a light modification with the same used energy can highly increase damping performances.
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ABSTRACT Recent trends in energy conversion mechanisms have demonstrated the abilities of electrostrictive polymers for converting mechanical vibrations into electricity. In particular, such materials present advantageous features such as... more
ABSTRACT Recent trends in energy conversion mechanisms have demonstrated the abilities of electrostrictive polymers for converting mechanical vibrations into electricity. In particular, such materials present advantageous features such as a high productivity, high flexibility, and ease of processing; hence, the application of these materials for energy harvesting purposes has been of significant interest over the last few years. The purpose of this paper is to propose the mechanical effect on the performance of electrostrictive polymers for energy harvesting. when the sample simultaneously driven by an electrical field and a mechanical excitation. Experimental measurements of the harvested power has been compared with the theoretical behavior predicted by the proposed model. A good agreement was observed between the experimental and the theoretical results. Finally, the results indicated that the strain was the crucial parameter for a good efficiency of the electromechanical conversion with electrostrictive polymers.
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Although polylactic acid (PLA) is widely identified as a biodegradable polymer, its use is limited due to the inherently poor mechanical properties. Therefore, the strengthening of PLA with microscale particles like lead zirconate... more
Although polylactic acid (PLA) is widely identified as a biodegradable polymer, its use is limited due to the inherently poor mechanical properties. Therefore, the strengthening of PLA with microscale particles like lead zirconate titanate (PZT) is a promising field of research that has only just begun to be explored. Piezoelectric polymer-PZT films are encouraging materials for modern applications. PLA/PZT composites have been elaborated with diverse content of PZT employing a solvent casting technique. The mechanical characteristics and dielectric properties of the considered films were investigated. X-ray Diffraction (XRD). Fourier Transform Infrared (FTIR) Spectroscopy and Scanning Electron Microscopy (SEM) were used to examine the influence of these fillers at the molecular level, crystal structural change, micro charges dispersion inside the polymer matrix, and Thermogravimetric Analysis (TGA) was used to examine the stability and thermal degradation of the films. The change i...
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During these last years, the demand of miniaturized voltage transformers increased with the fast multiplication of portable equipment's. The miniaturization of the electromagnetic transformer is more difficult. An interesting solution... more
During these last years, the demand of miniaturized voltage transformers increased with the fast multiplication of portable equipment's. The miniaturization of the electromagnetic transformer is more difficult. An interesting solution consists of the use of the piezoelectric transformer of small dimensions which coupling among the primary and the secondary is assured by a mechanical vibration. The aim of this study is to show the possibility of using typical micro piezoelectric transformers to realize strongly integrated systems of millimeter-length size. As application, the produced energy by the piezoelectric transformer is stored in a battery. A micro controller connected in series with a chopper is used in order to control the power accumulated in the battery. In this paper we introduced the mechanical losses in the model of the piezoelectric transformer in order to improve the efficiency of the piezoelectric transformer.
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lté rie, 6, Fa co Keywords: Embedded adatom method derived from the embedded atom method. In the case of monomer diffusion, both simple jump and long ters (nP 2) on metal surface is one of the most important factors controlling the film... more
lté rie, 6, Fa co Keywords: Embedded adatom method derived from the embedded atom method. In the case of monomer diffusion, both simple jump and long ters (nP 2) on metal surface is one of the most important factors controlling the film growth. However, the diffusion of monomers has been the subject of many studies and it has attracted consider-able interest from both the experimental [4–7] and the theoretical points of view [8–19]. In this context, the diffusion of Ag on Cu(110) [20–23] has been studied by molecular dynamics showing different processes of diffusion such as diffusion by uncorrelated follow an ctivation (Ed1 = 0.82 eV, Ed2 = 0.89 eV). Despite the importance of one-adatom diffusion, it is stil ficient to give comprehensive information about growth th For this reason, the diffusion of small cluster (one-dimensional clusters) has attracted the scientific community attention. Con-cerning dimer diffusion, many systems have been studied such as Pt2/Pt(111) [26], Ir/Ir(110)...
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Advanced materials such as carbon fiber, composite materials et al. are more and more used in modern industry. They make the structures lighter and Stiffer. However, they bring vibration problems. Researchers studied numerous methods to... more
Advanced materials such as carbon fiber, composite materials et al. are more and more used in modern industry. They make the structures lighter and Stiffer. However, they bring vibration problems. Researchers studied numerous methods to eliminate the undesirable vibrations. These treatments are expected to be a compact, light, intellectual and modular system. Recently, nonlinear techniques which are known as Synchronized Switch Damping (SSD) technique was proposed. These techniques synchronously switched when structure got to its displacement extremes that leading to a nonlinear voltage on the piezoelectric elements. This paper presents a performance analysis of an improved modal SSDI approach called "SSDI Max". The particularity of this new approach is to maximize the self generated voltage amplitude by a proper definition of the switch instants according to the chosen targeted mode. This paper presents simulations performed on a model representative of a smart beam. Damp...
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lté rie, 6, Fa co Keywords: Embedded adatom method derived from the embedded atom method. In the case of monomer diffusion, both simple jump and long ters (nP 2) on metal surface is one of the most important factors controlling the film... more
lté rie, 6, Fa co Keywords: Embedded adatom method derived from the embedded atom method. In the case of monomer diffusion, both simple jump and long ters (nP 2) on metal surface is one of the most important factors controlling the film growth. However, the diffusion of monomers has been the subject of many studies and it has attracted consider-able interest from both the experimental [4–7] and the theoretical points of view [8–19]. In this context, the diffusion of Ag on Cu(110) [20–23] has been studied by molecular dynamics showing different processes of diffusion such as diffusion by uncorrelated follow an ctivation (Ed1 = 0.82 eV, Ed2 = 0.89 eV). Despite the importance of one-adatom diffusion, it is stil ficient to give comprehensive information about growth th For this reason, the diffusion of small cluster (one-dimensional clusters) has attracted the scientific community attention. Con-cerning dimer diffusion, many systems have been studied such as Pt2/Pt(111) [26], Ir/Ir(110)...
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The field of power harvesting has experienced significant growth over the past few years due to the ever-increasing desire to produce portable and wireless electronics with extended lifespans. The present work aims to introduce an... more
The field of power harvesting has experienced significant growth over the past few years due to the ever-increasing desire to produce portable and wireless electronics with extended lifespans. The present work aims to introduce an approach to harvesting electrical energy from a mechanically excited piezoelectric element and investigates a power analytical model generated by a smart structure of type polyvinylidene fluoride(PVDF) that can be stuck onto fabrics and flexible substrates. Moreover, we report the effects of various substrates and investigates the sticking of these substrates on the characterization of the piezoelectric material.
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Advanced materials such as carbon fiber, composite materials et al. are more and more used in modern industry. They make the structures lighter and Stiffer. However, they bring vibration problems. Researchers studied numerous methods to... more
Advanced materials such as carbon fiber, composite materials et al. are more and more used in modern industry. They make the structures lighter and Stiffer. However, they bring vibration problems. Researchers studied numerous methods to eliminate the undesirable vibrations. These treatments are expected to be a compact, light, intellectual and modular system. Recently, nonlinear techniques which are known as Synchronized Switch Damping (SSD) technique was proposed. These techniques synchronously switched when structure got to its displacement extremes that leading to a nonlinear voltage on the piezoelectric elements. This paper presents a performance analysis of an improved modal SSDI approach called "SSDI Max". The particularity of this new approach is to maximize the self generated voltage amplitude by a proper definition of the switch instants according to the chosen targeted mode. This paper presents simulations performed on a model representative of a smart beam. Damp...
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The field of power harvesting has experienced significant growth over the past few years due to the ever-increasing desire to produce portable and wireless electronics with extended lifespans. The present work aims to introduce an... more
The field of power harvesting has experienced significant growth over the past few years due to the ever-increasing desire to produce portable and wireless electronics with extended lifespans. The present work aims to introduce an approach to harvesting electrical energy from a mechanically excited piezoelectric element and investigates a power analytical model generated by a smart structure of type polyvinylidene fluoride(PVDF) that can be stuck onto fabrics and flexible substrates. Moreover, we report the effects of various substrates and investigates the sticking of these substrates on the characterization of the piezoelectric material.
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ABSTRACT Nanotechnology is all about making products from very small constituents, components or subsystems to gain greatly enhanced material properties and functionality. Nanocrystalline anatase TiO2 was prepared by a facile sol–gel... more
ABSTRACT Nanotechnology is all about making products from very small constituents, components or subsystems to gain greatly enhanced material properties and functionality. Nanocrystalline anatase TiO2 was prepared by a facile sol–gel route at a temperature of 50°C under mild conditions. Titanium tetraisopropoxide (TTIP) was used as a titanium precursor, and 2-propanol was used as a solvent. XRD, TEM, SEM, FT-IR and BET were applied to characterize the crystal phase. The Crystalline size of TiO2 powder has been obtained with diameter < 30 nm for anatase at 500°C using an acid.
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Cet ouvrage décrit une recherche ancrée en récupération d’énergie par les polymères électro-actifs. Les tendances récentes à la fois dans l'industrie et au domaine de la recherche ont mis l'accent sur les polymères électro-actifs... more
Cet ouvrage décrit une recherche ancrée en récupération d’énergie par les polymères électro-actifs. Les tendances récentes à la fois dans l'industrie et au domaine de la recherche ont mis l'accent sur les polymères électro-actifs pour la conversion d'énergie électromécanique. Cet intérêt s'explique par de nombreux avantages tels que la productivité élevée, la grande flexibilité, et la facilité de traitement. En effet la grande majorité des polymères électro-actifs nécessite des champs électriques d’activation importants, ce qui représente un verrou technologique pour la plupart des applications. Pour palier à ce problème, des particules conductrices sont ajoutées à la matrice polymère, afin d’accroître l’activité électromécanique. Les nouvelles techniques consistent à maximiser la densité d’énergie récupérée. Le bilan énergétique de la conversion a été contrôlé en utilisant FFT. Ainsi, une amélioration de celle-ci par des électrets de polypropylène, afin d’assurer un...
The Lead Zirconate titanate (PZT) ceramic is known by its piezoelectric feature, but also by its stiffness, the use of a composite based on a polyurethane (PU) matrix charged by a piezoelectric material, enable to generate a large... more
The Lead Zirconate titanate (PZT) ceramic is known by its piezoelectric feature, but also by its stiffness, the use of a composite based on a polyurethane (PU) matrix charged by a piezoelectric material, enable to generate a large deformation of the material, therefore harvesting more energy. This new material will provide a competitive alternative and low cost manufacturing technology of autonomous systems (smart clothes, car seat, boat sail, flag ...). A thin film of the PZT/PU composite was prepared using up to 80 vol. % of ceramic. Due to the dielectric nature of the PZT, inclusions of this one in a PU matrix raises the permittivity of the composite, on other hand this latter seems to decline at high frequencies.
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Electrostrictive polymers offer the promise of energy harvesting with few moving parts where power can be produced simply by stretching and contracting a relatively low-cost rubbery material. The use of such polymers for energy harvesting... more
Electrostrictive polymers offer the promise of energy harvesting with few moving parts where power can be produced simply by stretching and contracting a relatively low-cost rubbery material. The use of such polymers for energy harvesting is a growing field, which has great potential from an energy density viewpoint. Basically, the relative energy gain depends on the current induced by the mechanical strain and frequency. A previous study in the Laboratoire de Génie Electrique et Ferroélectricité laboratory has indicated that one can measure the dielectric constant, the Young’s modulus, and the electrostrictive coefficient of a polymer film by determining the current flowing through the sample when the polymer film was simultaneously driven by an electrical field and mechanical excitation. The goal of this study has thus been to develop a solution for artificially increasing the coupling factor of electrostrictive materials, based on the optimization of the frequency of the electric...
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ABSTRACT The harvesting energy with electrostrictive polymers has great potential for remote applications such as invivo sensors, embedded micro-electro-mechanical systems devices, and distributed network instruments. A majority of... more
ABSTRACT The harvesting energy with electrostrictive polymers has great potential for remote applications such as invivo sensors, embedded micro-electro-mechanical systems devices, and distributed network instruments. A majority of current research activities in this field refers to classical piezoelectric ceramics, but electrostrictive polymers offer promise of energy harvesting with few moving parts; power can be produced by simply stretching and contracting a relatively low-cost rubbery material. The use of such polymers for energy harvesting is a growing field, which has great potential from an energy density viewpoint. The output power is inversely proportional to the harvester&#39;s frequency bandwidth. Consequently, it is much harder to efficiently harvest power from low-frequency sources with a large frequency band response and with a very small system size than from a stabilized high-frequency vibration source. This paper presents a new structure that is able to predict mechanical frequency excitation in order to increase power-harvesting capabilities of electrostrictive polymers. An equivalent structure scheme has been developed by using current and electrical schemes models. With a transverse strain of 0.5% and a bias field of 10 V/μm, such a process rendered it possible to increase the converted power by 80% with a low-frequency mechanical excitation. This study contributes to provide a framework for developing an innovative energy-harvesting technology that collects vibrations from the environment and converts them into electricity to power a variety of sensors.
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ABSTRACT For applications concerning vehicle suspension or the membranes of acoustic loud speakers, a conventional stiffness control method is both useful and desired. However, without total replacement of the material itself or its... more
ABSTRACT For applications concerning vehicle suspension or the membranes of acoustic loud speakers, a conventional stiffness control method is both useful and desired. However, without total replacement of the material itself or its structure, modification of the stiffness is not an easy matter. Besides, the technology of electro active polymers (EAPs) is a fast-moving topic. The high electro-induced strain level of these materials is an attractive advantage compared to many other mechanical/electrical converging sensor/actuator materials such as piezo devices. This paper presents an easy and innovative method to control the stiffness of EAPs. First, a polyurethane (PU) sample was pre-stretched in the 1-direction, and clamped at both ends. Then, an electrical field was induced in the 3-direction. The positive elongation in the 1-direction created a force opposite to that of the pre-stretching since the specimen was clamped. From the equation of force valence, a simple stiffness equation was obtained with the ratio between the pre-stretching force and the force created by the electrical stimuli. Concerning the electrical saturation in the EAP material, the variation in stiffness could be expressed by the equation of electrical field. With a simple experimental viewing, more than 30% of stiffness variation could be obtained with a moderate electrical induction, &lt;32 V/μm.
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Because of some of their diverse benefits, intelligent textiles have attracted a great deal of interest among specialists over the past decade. This paper describes a novel approach to the manufacture of intelligent piezoelectric... more
Because of some of their diverse benefits, intelligent textiles have attracted a great deal of interest among specialists over the past decade. This paper describes a novel approach to the manufacture of intelligent piezoelectric polymer-based textiles with enhanced piezoelectric responses for applications that extract biomechanical energy. Here we report a highly scalable and ultrafast production of smart textile piezoelectric containing graphene oxide nanosheets (GONS) dispersed in polyvinylidene fluoride (PVDF). In this work, Cotton textiles (CT) were functionalized and by graphene oxide (GO), using PVDF as a binder to obtain a CT-PVDF-GO material. Tetraethyl orthosilicate (TEOS) was further grafted as a coating layer to improve the surface compatibility, resulting in the CT-PVDF-GO-TEOS composite. The research results show that the addition of GONS significantly improves PVDF's overall crystallization rate on CT. More specifically, the piezoelectric β-phase content (100 % hi...
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The field of power harvesting has experienced significant growth over the past few years due to the ever-increasing desire to produce portable and wireless electronics with extended lifespans. The present work aims to introduce an... more
The field of power harvesting has experienced significant growth over the past few years due to the ever-increasing desire to produce portable and wireless electronics with extended lifespans. The present work aims to introduce an approach to harvesting electrical energy from a mechanically excited piezoelectric element and investigates a power analytical model generated by a smart structure of type polyvinylidene fluoride(PVDF) that can be stuck onto fabrics and flexible substrates, although we report the effects of various substrates and investigates the sticking of these substrates on the characterization of the piezoelectric material.
The flexible piezoelectric nanocomposite films have attracted considerable interest for use in autonomous nanosystems, sensors and portable electronics. The effect of graphene oxide (GO) nanoparticles on the crystal structure, unique... more
The flexible piezoelectric nanocomposite films have attracted considerable interest for use in autonomous nanosystems, sensors and portable electronics. The effect of graphene oxide (GO) nanoparticles on the crystal structure, unique crystallization, mechanical behavior and significant improvement in piezoelectricity of polylactic acid (PLA) has been reported. Polylactic acid / graphene oxide (PLA/GO) nanocomposite films were prepared by the solvent casting technique using different percentages of GO. The different samples were characterized by Polarized optical microscope (POM), Fourier transformed infrared (FTIR) and X-ray diffraction analysis. The presence of β phase in nanocomposites and the enhancement of their piezoelectric properties were confirmed by FTIR and XRD analysis. These electroactive and biodegradable polymer nanocomposite thin films may be a potential candidate for the piezoelectric nanogenerators, energy storage devices and energy harvesting applications.