In the last few years, there has been an increasing demand for low-power and portable-energy sources due to development mass consumption of portable electronic devices. Furthermore, must be associated with environmental issues imposed regulations. These demands support research in areas generation methods. this scope, piezoelectric materials become a strong candidate energy storage future applications. This paper describes use polymers order harvest from people walking fabrication shoe...

The effect of the bonding layer type and piezoelectric thickness on magnetoelectric (ME) response layered poly(vinylidene fluoride) (PVDF)/epoxy/Vitrovac composites is reported. Three distinct epoxy types were tested, commercially known as M-Bond, Devcon, Stycast. main differences among them are their different mechanical characteristics, in particular value Young modulus, coupling with polymer Vitrovac (Fe39Ni39Mo4Si6B12) layers laminate. laminated prepared M-Bond exhibit highest ME...

A flexible, low-cost energy-harvesting device based on the magnetoelectric (ME) effect was designed using Fe64Co17Si7B12 as amorphous magnetostrictive ribbons and polyvinylidene fluoride (PVDF) piezoelectric element. 3 cm-long sandwich-type laminated composite fabricated by gluing to PVDF with an epoxy resin. voltage multiplier circuit produce enough charge a battery. The power output density obtained were 6.4 μW 1.5 mW cm−3, respectively, at optimum load resistance measured...

Battery separators based on silk fibroin (SF) have been prepared aiming at improving the environmental issues of lithium-ion batteries. SF materials with three different morphologies were produced: membrane films (SF-F), sponges by lyophilization (SF-L), and electrospun membranes (SF-E). The latter presented a suitable porous three-dimensional microstructure soaked 1 M LiPF6 electrolyte. ionic conductivities for SF-L SF-E 1.00 0.32 mS cm-1 20 °C, respectively. A correlation between fraction...

Harvesting magnetic energy from the environment is becoming increasingly attractive for being a renewable and inexhaustible power source, ubiquitous accessible in remote locations. In particular, harvesting with polymer-based magnetoelectric (ME) materials meet industry demands of flexible, showing large area potential, lightweight biocompatibility. order to get best process, extraction circuit needs be optimized useful powering devices. This paper discusses design performance five interface...

It is successfully demonstrated that nanoparticle's magnetostriction can be accurately determined based on the magnetoelectric effect measured polymeric composite materials. This represents a novel, simple and versatile method for determination of particle's at nano scale in their dispersed state, which has been, up to now, difficult imprecise task.

Flexible particulate composites with general formula [xCoFe2O4]/[(1 − x) (Polyvinylidene fluoride)] were prepared for x = 0, 3, 11, and 20 wt. %. The dielectric constant, loss, saturation magnetization of the increase increasing CoFe2O4 content, being 13, 0.13, 13 emu g−1, respectively, 20. change in response (magnetodielectric effect (%)) is highest among all reported polymer-based sample (4.2%), on contrary, value magnetodielectric coefficient (γ) higher 3 (0.015 emu−2 g2). Such features...

The development of a DC magnetic field sensor based on magnetoelectric (ME) PVDF/Metglas composite is reported. ME sensing has an electromechanical resonance frequency close to 25.4 kHz, linear response (r <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> = 0.997) in the 0-2 Oe range, and maximum output voltage 112 mV (ME coefficient α <sub xmlns:xlink="http://www.w3.org/1999/xlink">33</sub> ≈30 V·cm...

The magnetoelectric (ME) effect is increasingly being considered an attractive alternative for magnetic field and smart current sensing, able to sense static dynamic fields. This work reports on a contactless DC sensor device based ME PVDF/Metglas composite, solenoid the corresponding electronic instrumentation. sample shows maximum resonant coefficient (α33) of 34.48 V cm−1 Oe−1, linear response (R2 = 0.998) sensitivity 6.7 mV A−1. With incorporation charge amplifier, AC-RMS converter...

The anisotropic magnetoelectric (ME) effect on a Fe61.6Co16.4Si10.8B11.2/PVDF Fe61.6Co16.4Si10.8B11.2 laminate composite has been used for the development of magnetic field sensor able to detect both magnitude and direction AC DC fields. accuracy (99% sensors), linearity (92% 99% sensor) reproducibility sensors) indicate suitability applications. Furthermore, sensitivity Fe61.6Co16.4Si10.8B11.2/PVDF/Fe61.6Co16.4Si10.8B11.2 sensor—15 1400 mV Oe−1 fields, respectively—are highest reported in...

In order to obtain a wide-range magnetoelectric (ME) response on ME nanocomposite that matches industry requirements, Tb0.3Dy0.7Fe1.92 (Terfenol-D)/CoFe₂O₄/P(VDF-TrFE) flexible films were produced by the solvent casting technique and their morphologic, piezoelectric, magnetic properties investigated. The obtained composites revealed high piezoelectric (≈-18 pC·N-1) is independent of weight ratio between fillers. turn, influenced composite composition. It was found magnetization saturation...

In recent years, there has been a rapid growth in the use of composite materials engineering applications, and this evidence should continue. However, desire necessity to improve efficiency these for applications more ambitious have led several nano-sized fillers. fact, nanoparticles with typical dimensions range between 1 100 nm widely studied due their unique surface effect, increased chemical activity physical properties. From all nanofillers mechanical performance materials, graphene is...

Different commercial Y zeolites derivate from faujasite structure with similar total Si/Al ratio, NaY (Si/Al = 2.83), HY 2.80), and HUSY 3.00), but different framework ratios were used to prepare α-poly(vinylidene fluoride) (α-PVDF)/zeolite nanocomposites. Structural textural characterization of was obtained by XRD, FTIR, elemental analysis nitrogen adsorption isotherms. Nanocomposite films prepared containing 14% (w/w) zeolite characterized in terms the dielectric response thermal...

Printed electrodes were developed by screen-printing from an ink formulation a green solvent, new polymer binder, and graphite (anode) or C-LiFePO4 (cathode). The morphological electrochemical properties of the investigated compared to prepared with poly(vinylidene fluoride), PVDF, as binder. shows similar processability apparent viscosity 0.09 0.07 Pa s at 100 s–1 for cathode anode inks, respectively. morphology both is homogeneous, in relation performance, discharge capacity value film...

This work intends to study the effect of curing parameters on mechanical properties a polyester resin without complete reaction process. For this purpose, cures at room temperature, 40 °C, and 60 post-cures °C with different exposure times, were considered. Three-point bending tests performed assess both stress relaxation creep behavior. The degree crosslinking was estimated by evaluating C = ester bond, Fourier infrared spectroscopy complemented thermal characterization made differential...