scholarly journals Acoustic Energy Harvesting and Sensing via Electrospun PVDF Nanofiber Membrane

Sensors ◽  
2020 ◽  
Vol 20 (11) ◽  
pp. 3111 ◽  
Author(s):  
Nader Shehata ◽  
Ahmed H. Hassanin ◽  
Eman Elnabawy ◽  
Remya Nair ◽  
Sameer A. Bhat ◽  
...  
Keyword(s):  
Vinylidene Fluoride ◽  
Low Cost ◽  
Acoustic Signals ◽  
Acoustic Energy ◽  
Electrospun Nanofiber ◽  
Electric Voltage ◽  
Poly Vinylidene Fluoride ◽  
Innovative Solution ◽  
Acoustic Energy Harvesting ◽  
Spectrum Region

This paper introduces a new usage of piezoelectric poly (vinylidene fluoride) (PVDF) electrospun nanofiber (NF) membrane as a sensing unit for acoustic signals. In this work, an NF mat has been used as a transducer to convert acoustic signals into electric voltage outcomes. The detected voltage has been analyzed as a function of both frequency and amplitude of the excitation acoustic signal. Additionally, the detected AC signal can be retraced as a function of both frequency and amplitude with some wave distortion at relatively higher amplitudes and within a certain acoustic spectrum region. Meanwhile, the NFs have been characterized through piezoelectric responses, beta sheet calculations and surface morphology. This work is promising as a low-cost and innovative solution to harvest acoustic signals coming from wide resources of sound and noise.

scholarly journals Nanocomposite multilayer capacitors comprising BaTiO3@TiO2 and poly(vinylidene fluoride-hexafluoropropylene) for dielectric-based energy storage

2014 ◽  
Vol 04 (02) ◽  
pp. 1450009 ◽  
Author(s):  
Mojtaba Rahimabady ◽  
Li Lu ◽  
Kui Yao
Keyword(s):  
Energy Storage ◽  
Energy Density ◽  
Vinylidene Fluoride ◽  
Discharge Rate ◽  
Low Cost ◽  
Breakdown Field ◽  
High Discharge ◽  
High Discharge Rate ◽  
Poly Vinylidene Fluoride ◽  
Multilayer Capacitors

Multilayer dielectric capacitors were fabricated from nanocomposite precursor comprised of BaTiO 3@ TiO 2 core–shell nanosized particles and poly(vinylidene fluoride–hexafluoropropylene) (P(VDF–HFP)) polymer matrix (20 vol%). The multilayer capacitors showed very high discharge speed and high discharged energy density of around 2.5 J/cm3 at its breakdown field (~ 166 MV/m). The energy density of the nanocomposite multilayer capacitors was substantially higher than the energy density of commercially used power capacitors. Low cost, flexible structure, high discharge rate and energy density suggest that the nanocomposite multilayer capacitors are promising for energy storage applications in many power devices and systems.

Fabrication of a low-cost functionalized poly(vinylidene fluoride) nanohybrid membrane for superior fuel cells

2019 ◽  
Vol 3 (5) ◽  
pp. 1269-1282 ◽  
Author(s):  
Om Prakash ◽  
Karun Kumar Jana ◽  
Murli Manohar ◽  
Vinod K. Shahi ◽  
Saif A. Khan ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Power Density ◽  
High Power ◽  
Heavy Ions ◽  
Vinylidene Fluoride ◽  
Low Cost ◽  
High Power Density ◽  
The Novel ◽  
Swift Heavy Ions ◽  
Poly Vinylidene Fluoride

Advanced membrane was designed by creating nanochannels using swift heavy ions from an accelerator. Fuel cell was fabricated using the novel membrane and demonstrated high power density as compared to standard Nafion.

Ink-jet printing of ferroelectric poly(vinylidene fluoride-trifluoroethylene) copolymers

2005 ◽  
Vol 889 ◽  
Author(s):  
Shihai Zhang ◽  
Ziqi Liang ◽  
Qing Wang ◽  
Q.M. Zhang
Keyword(s):  
Vinylidene Fluoride ◽  
Low Cost ◽  
Gold Surface ◽  
Bulk Sample ◽  
Boiling Temperature ◽  
Active Components ◽  
Ink Jet Printing ◽  
Ink Jet ◽  
Poly Vinylidene Fluoride ◽  
Jet Printing

AbstractPoly(vinylidene fluoride-trifluoroethylene) [P(VDF-TrFE)] copolymers are well known for their excellent ferroelectric and other related properties and they are being exploited as active components in many microdevices such as ferroelectric memory cells and infrared sensors. Compared with conventional photolithography, ink-jet printing provides a low-cost versatile method to fabricate polymer micro-devices. In this paper, the influences of driving waveform at the jet head, ink concentration, substrate chemistry, and the solvent quality on the printed P(VDF-TrFE) dots were investigated. It was found that well-defined P(VDF-TrFE) micro-dots with diameter of less than 30 mm and thickness of ∼1 μm can be printed by using a mixed solvent system, consisting of a good solvent with relatively low boiling temperature and a poor solvent with high boiling temperature, on perfluorinated hydrophobic gold surface. The printed P(VDF-TrFE) micro-dots possess crystallinity comparable to that of the bulk sample, suggesting that ink-jet printing technology is a promising micro-fabrication technology for manufacturing P(VDF-TrFE)-based micro-sensors and other micro-devices.

scholarly journals Enhancement of Piezoelectric Coefficient (d33) in PVDF-TrFe/CoFe2O4 nanocomposites through DC magnetic poling

2021 ◽  
Author(s):  
Marco Fortunato ◽  
Alessio Tamburrano ◽  
Maria Paola Bracciale ◽  
Maria Laura Santarelli ◽  
Maria Sabrina Sarto
Keyword(s):  
Magnetic Fields ◽  
Electric Fields ◽  
Piezoelectric Coefficient ◽  
Vinylidene Fluoride ◽  
Piezoelectric Materials ◽  
Low Cost ◽  
Sample Surface ◽  
Special Focus ◽  
Phase Alignment ◽  
Poly Vinylidene Fluoride

In the last years flexible, low-cost, wearable and innovative piezoelectric nanomaterials, have attracted a considerable interest to develop energy harvesters and sensors. Among the piezoelectric materials, a special focus was paid on  electroactive polymers such as Poly(vinylidene fluoride) [PVDF] and on its copolymer Poly(vinylidene fluoride-co-trifluoroethylene) [PVDF-TrFe], which is one of the most investigated piezoelectric polymers, due to the high β-phase content resulting under specific curing or processing conditions. However, to get high piezoelectric coefficient (d33), alignment of the β-phase domains is needed, which is usually obtained by applying a high electric fields at moderate temperatures. This process, usually referred as electrical poling, requires the deposition of contact electrodes over the sample surface, and the use of high voltage apparatus.   In the present work, in order to overcome these constraints we have produced, characterized and studied a polymer nanocomposite, consisting of CoFe2O4 nanoparticles dispersed in PVDF-TrFe with enhancement of the β-phase alignment through and applied a DC magnetic fields. The magnetic poling was demonstrated to be particular effective, leading to a piezoelectric coefficient, d33, with values up to 39 pm/V. The magnetic poling does not need the use a top electrode and of high magnetic fields (the maximum value of d33 was obtained at 50 mT, using a current of 0.4 A) making the PVDF-TrFE/CoFe2O4 nanocomposite suitable for the fabrication of highly efficient devices for energy harvesting and wearable sensors.

Novel Carbon Nanotube Reinforced Electro-Active Polymer Sensors for Structural Vibration Control

2004 ◽  
Author(s):  
Arun Ramaratnam ◽  
Nader Jalili
Keyword(s):  
Carbon Nanotubes ◽  
Vibration Control ◽  
Vinylidene Fluoride ◽  
Low Cost ◽  
Active Vibration Control ◽  
Structural Vibration ◽  
Piezoelectric Polymers ◽  
Polymer Sensors ◽  
Poly Vinylidene Fluoride ◽  
Damping Materials

Electro-active polymers like poly(vinylidene fluoride) — PVDF and their copolymers, have been emerging as a low cost substitutes for piezoelectric ceramics. Carbon nanotubes with their excellent physical and electronic properties can be used in these electro-active polymers to enhance their actuation and sensing properties. In the work presented here, actuators and sensors have been fabricated using piezoelectric polymers reinforced with carbon nanotubes. Single-walled and multi-walled nanotubes are used to reinforce the piezoelectric polymers. The response of these actuators and sensors are measured and the influence of the fabrication methods on the sensor performance is determined. The use of these materials as actuators and sensors to implement active vibration control is studied. These transducers also serve as additional damping materials added to the structure undergoing vibration due to their viscous damping properties. The change in properties of these piezoelectric polymers with different fabrication conditions and nanotube addition, though provokes doubts about standardization, invokes more research efforts on these new generation transducers.

scholarly journals Towards Poly(vinylidene fluoride-trifluoroethylene-chlorotrifluoroethylene)-Based Soft Actuators: Films and Electrospun Aligned Nanofiber Mats

Nanomaterials ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 172
Author(s):  
Riccardo D’Anniballe ◽  
Andrea Zucchelli ◽  
Raffaella Carloni
Keyword(s):  
Vinylidene Fluoride ◽  
Weight Ratio ◽  
Tensile Load ◽  
Mechanical Analysis ◽  
Load Test ◽  
Uniaxial Tensile ◽  
Electrospun Nanofiber ◽  
Poly Vinylidene Fluoride ◽  
Soft Actuators ◽  
Electrostrictive Effect

In the pursuit of designing a linear soft actuator with a high force-to-weight ratio and a stiffening behavior, this paper analyzes the electrostrictive effect of the poly(vinylidene fluoride-trifluoroethylene-chlorotrifluoroethylene) polymer in the form of film and aligned electrospun nanofiber mat. An experimental setup is realized to evaluate the electrostrictive effect of the specimens disjointly from the Maxwell stress. In particular, an uniaxial load test is designed to evaluate the specimens’ forces produced by their axial contraction (i.e., the electrostrictive effect) when an external electric field is applied, while an uniaxial tensile load test is designed to show the specimens’ stiffening properties. This electro-mechanical analysis demonstrates that both the film and the nanofiber mat are electrostrictive, and that the nanofiber mat exhibits a force-to-weight ratio ∼65% higher than the film and, therefore, a larger electrostrictive effect. Moreover, both the film and the nanofiber mat show a stiffening behavior, which is more evident for the nanofiber mat than the film and is proportional to the weight of the material. This study concludes that, thanks to its electro-mechanical properties, the poly(vinylidene fluoride-trifluoroethylene-chlorotrifluoroethylene), especially in the form of aligned electrospun nanofiber mat, has high potential to be used as electro-active polymer for soft actuators in biomedical and biorobotics applications.

Amorphous SiO2 NP-Incorporated Poly(vinylidene fluoride) Electrospun Nanofiber Membrane for High Flux Forward Osmosis Desalination

2016 ◽  
Vol 8 (7) ◽  
pp. 4561-4574 ◽  
Author(s):  
M. Obaid ◽  
Zafar Khan Ghouri ◽  
Olfat A. Fadali ◽  
Khalil Abdelrazek Khalil ◽  
Abdulhakim A. Almajid ◽  
...  
Keyword(s):  
Vinylidene Fluoride ◽  
Forward Osmosis ◽  
High Flux ◽  
Electrospun Nanofiber ◽  
Nanofiber Membrane ◽  
Amorphous Sio2 ◽  
Poly Vinylidene Fluoride

scholarly journals Optimized Batch Process for Organic MEMS Devices

Proceedings ◽  
2018 ◽  
Vol 2 (13) ◽  
pp. 904
Author(s):  
Jonas Hafner ◽  
Marco Teuschel ◽  
Jürgen Schrattenholzer ◽  
Michael Schneider ◽  
Ulrich Schmid
Keyword(s):  
Vinylidene Fluoride ◽  
Piezoelectric Properties ◽  
Low Cost ◽  
Batch Process ◽  
Organic P ◽  
Mems Devices ◽  
Poly Vinylidene Fluoride ◽  
First Results ◽  
Lift Off ◽  
Metal Layers

Recently, organic electromechanical transducers have attracted intense scientific and technological interest due to their unique mechanical flexibility and their piezoelectric properties. However, the fabrication of organic MEMS devices is challenging. For example, a lift-off process cannot be used on polymers, because of the solvent in photoresists. Here, we present a straightforward and low-cost batch process for organic MEMS devices using standard micromachining techniques. As organic material we used the ferroelectric (co-)polymer poly(vinylidene fluoride-trifluorethylene) (P(VDF-TrFE)). The integration of the polymer in a CMOS-compatible process was optimized in terms of deposition and patterning of the polymer and the corresponding metal layers. Micromachined devices, such as capacitors and cantilevers, were fabricated and analysed. The ferroelectric perfomance was evaluated by electrical and electromechanical measurements. Our first results indicate that the proposed fabrication process is reliable resulting in well-functioning organic MEMS devices. We measured as piezoelectric constant a d33 of −32 pm/V with our organic P(VDF-TrFE) capacitors.

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