Comparative Studies of Wet-Stretched and Non-Stretched Electrospun PVDF-HFP Nanofibers

2017 ◽  
Author(s):  
Alexander Wildgoose ◽  
Raghid Najjar ◽  
Jason Dittman ◽  
Harrison Hones ◽  
Emily Umbach ◽  
...  
Keyword(s):  
Alternative Energy ◽  
Piezoelectric Materials ◽  
Mechanical Energy ◽  
Body Movement ◽  
Electrospun Nanofibers ◽  
Electrospinning Technique ◽  
Fiber Network ◽  
Energy Harvesters ◽  
Portable Electronics ◽  
Alternative Energy Sources

The recent growth in portable electronics has sparked a demand for alternative energy sources. Energy harvesters that utilize piezoelectric materials are promising in capturing the mechanical energy from body movement to power portable electronics. This study investigated the characteristics of PVDF-HFP nanofibers created from traditional electrospinning and a novel technique called wet-stretching electrospinning. The solution was initially processed using the traditional method, flat-plate electrospinning, which resulted in a fiber network with random orientations. When performing electrical testing the fibers produced minimal voltage. The solution was then processed utilizing a novel wet-stretching electrospinning technique that allowed for fiber alignment and dynamic stretch ratios. Fibers that underwent this method produced higher voltages than fibers from the traditional electrospinning method. It was observed that fibers processed using the wet-stretching technique with different draw ratios (DR) such as 1 (DR 1) and 2.5 (DR 2.5) showed enhanced piezoelectric properties. This research suggests that the wet-stretched PVDF-HFP nanofibers are better suited for piezoelectric applications than traditionally electrospun nanofibers.

scholarly journals Development of Smart Shoes Using Piezoelectric Material

2021 ◽  
Vol 7 (1) ◽  
pp. 49-55
Author(s):  
Affa Rozana Abdul Rashid ◽  
Nur Insyierah Md Sarif ◽  
Khadijah Ismail
Keyword(s):  
Piezoelectric Material ◽  
Alternative Energy ◽  
Piezoelectric Materials ◽  
Mechanical Energy ◽  
Electronic Devices ◽  
Electrical Energy ◽  
Small Scale ◽  
Power Electronic ◽  
Energy Harvesters ◽  
Almost All

The consumption of low-power electronic devices has increased rapidly, where almost all applications use power electronic devices. Due to the increase in portable electronic devices’ energy consumption, the piezoelectric material is proposed as one of the alternatives of the significant alternative energy harvesters. This study aims to create a prototype of “Smart Shoes” that can generate electricity using three different designs embedded by piezoelectric materials: ceramic, polymer, and a combination of both piezoelectric materials. The basic principle for smart shoes’ prototype is based on the pressure produced from piezoelectric material converted from mechanical energy into electrical energy. The piezoelectric material was placed into the shoes’ sole, and the energy produced due to the pressure from walking, jogging, and jumping was measured. The energy generated was stored in a capacitor as piezoelectric material produced a small scale of energy harvesting. The highest energy generated was produced by ceramic piezoelectric material under jumping activity, which was 1.804 mJ. Polymer piezoelectric material produced very minimal energy, which was 55.618 mJ. The combination of both piezoelectric materials produced energy, which was 1.805 mJ from jumping activity.

Study of Energy Harvesting Performance of Wet-Stretched PVDF Nanofibers

2016 ◽  
Author(s):  
Raghid Najjar ◽  
Yi Luo ◽  
Xiao Hu ◽  
Vince Beachley ◽  
Wei Xue
Keyword(s):  
Energy Harvesting ◽  
Polyvinylidene Fluoride ◽  
Low Cost ◽  
Mechanical Energy ◽  
Body Movement ◽  
Electrical Energy ◽  
Electrospinning Process ◽  
Energy Harvesters ◽  
Portable Electronics ◽  
Wearable Systems

An average human body produces a large amount of energy throughout the day. A significant portion of this energy is utilized as mechanical energy. Body movement such as footfalls and arm swings can produce enough energy to power portable electronics using mechanical-to-electrical energy harvesters. These devices should be small, light, portable, and flexible. Polyvinylidene fluoride (PVDF) has shown a high biocompatibility and is a suitable candidate for energy harvesting applications. Moreover, PVDF can be produced in large quantities while still maintaining a low cost. Electrospinning is a common process used to prepare PVDF nanofibers. Here we introduce a novel technique called wet-stretched electrospinning to further increase the amount of energy generated by the PVDF devices. Our initial results show that the wet-stretched nanofibers outperform the regular PVDF nanofibers by up to 12 times under similar conditions. These promising results suggest that the proposed method has great potential to be utilized as a major improvement from the traditional electrospinning process of PVDF. These findings are significant and are especially pertinent to the field of energy harvesters designed for powering medical devices or wearable systems.

scholarly journals Flexible piezoelectric nanogenerator based on [P(VDF-HFP)]/ PANI-ZnS electrospun nanofibers for electrical energy harvesting

2021 ◽  
Vol 32 (5) ◽  
pp. 6358-6368
Author(s):  
Hemalatha Parangusan ◽  
Jolly Bhadra ◽  
Noora Al-Thani
Keyword(s):  
Energy Harvesting ◽  
Composite Nanofibers ◽  
In Situ Polymerization ◽  
Mechanical Energy ◽  
Electrospun Nanofibers ◽  
Interfacial Polarization ◽  
Electrical Energy ◽  
Core Shell ◽  
Electrospinning Technique ◽  
High Dielectric

Abstract Over the past decade, piezoelectric nanogenerator have attracted much attention to harvest mechanical energy from abundant resources in nature. Here, the ZnS microspheres is prepared by hydrothermal method and core-shell structured PANI/ZnS microspheres are synthesized by in situ polymerization method and then used as filler for the preparation of flexible [P(VDF-HFP)] based piezoelectric nanogenerator. The flexible P(VDF-HFP)/PANI-ZnS piezoelectric nanogenerator is prepared by Electrospinning technique. The core-shell PANI/ZnS composite improves the content of electroactive phase in [P(VDF-HFP)] and significantly improves the interfacial polarization between the PANI/ZnS particles and polymer matrix. Among all the samples, [P(VDF-HFP)]/2 wt% PANI-ZnS composite nanofibers exhibited the high piezoelectric peak-to-peak output voltage of 3 V compared with the neat [P(VDF-HFP)] (~ 120 mV). In addition, the high dielectric constant is observed for the [P(VDF-HFP)]/2 wt% PANI-ZnS composite nanofibers. These results implies that the fabricated flexible and efficient piezoelectric nanogenerator can be utilized for energy harvesting system.

scholarly journals Reliability Analysis of an Epileptic Seizure Detector Powered by an Energy Harvester

Micromachines ◽  
2019 ◽  
Vol 11 (1) ◽  
pp. 45
Author(s):  
Sunhee Kim ◽  
Suna Ju ◽  
Chang-Hyeon Ji
Keyword(s):  
Reliability Analysis ◽  
Epileptic Seizure ◽  
Alternative Energy ◽  
Energy Harvester ◽  
Supply Voltage ◽  
Energy Harvesters ◽  
Alternative Energy Sources ◽  
Piezoelectric Energy ◽  
Battery Energy ◽  
Implantable Biomedical Devices

Due to a limited lifetime of a battery, energy harvesters have been studied as alternative energy sources for implantable biomedical devices such as an implantable stimulator for epileptic seizure suppression. However, energy harvesters have weakness in providing stable power. We designed a neural recording circuit powered solely by a piezoelectric energy harvester, and applied its output to a seizure detector to analyze the reliability of the recorded signal. Performance of the seizure detector was evaluated. We found that the average time differences between with and without voltage variances were about 0.05 s under regular vibrations and about 0.07 s under irregular vibrations, respectively. The ratio of average true positive alarm period varied within about 0.02% under regular vibrations and 0.029% under irregular vibrations, respectively. The ratio of average false positive alarm period varied within about 0.004% under regular vibrations and 0.014% under irregular vibrations, respectively. This paper presents a reliability analysis of an epileptic seizure detector with a neural signal recording circuit powered by a piezoelectric energy harvester. The results showed that a supply voltage variance within ±10% could be acceptable for reliable operation of a seizure detector.

scholarly journals Piezoelectric energy harvesting pedal integrated with a compliant load amplifier

2019 ◽  
Vol 11 (1) ◽  
pp. 168781401882014
Author(s):  
YiHe Zhang ◽  
Chul-Hee Lee
Keyword(s):  
Energy Harvesting ◽  
Low Power ◽  
Alternative Energy ◽  
Compliant Mechanism ◽  
Piezoelectric Materials ◽  
Mechanical Energy ◽  
Optimization Methods ◽  
Energy Output ◽  
Element Analysis ◽  
Piezoelectric Energy

Energy generation technologies that use piezoelectric materials as uninterrupted power supplies are one of the most practical solutions of low-power wireless sensor network. The piezoelectric generator collects mechanical energy from the environment and transforms it into electricity to supply to microelectronic devices. Thus, these alternative energy sources can reduce the consumption of batteries, thereby reducing environmental pollution. Piezoelectric materials can work in the bending, compression, and shear modes, which are named as d31, d33, and d15 modes, respectively. In this study, a piezo stack which worked in d31 mode has been designed and integrated into an energy harvesting pedal. A novel compliant amplifying mechanism has to be designed to amplify the input load so that the high-stiffness piezoelectric stack can achieve a large energy output at a lower input force. This compliant mechanism has been designed by the pseudo-rigid-body and topology optimization methods. The amplification ratios of different sized flexible amplification mechanisms are calculated through the finite element analysis and validated by experiments. Finally, a pedal generator has been made and the test results show that the collected electricity can effectively drive a low-power microcontroller, sensor, and other devices of these kinds.

A review on piezoelectric fibers and nanowires for energy harvesting

2019 ◽  
pp. 152808371987019 ◽  
Author(s):  
Bilal Zaarour ◽  
Lei Zhu ◽  
Chen Huang ◽  
XiangYu Jin ◽  
Hadeel Alghafari ◽  
...  
Keyword(s):  
Energy Harvesting ◽  
Piezoelectric Materials ◽  
Mechanical Energy ◽  
Electrolyte Solutions ◽  
Polymeric Fibers ◽  
Comprehensive Overview ◽  
Energy Harvesters ◽  
Microelectronic Devices ◽  
Inorganic Nanowires ◽  
Self Powered

Recent advances in self-powered electronic devices have urged the development of energy-harvesting technology. Batteries are gradually unable to satisfy the practical requirements for powering the different types of microelectronic devices owing to their drawbacks such as occupying a significant percentage and weight of portable products, the need to replace or recharge them, constructing an important environmental impact, and the probable seepage of electrolyte solutions. Various technologies for converting renewable energies into electricity have been reported. Particularly, energy harvesters based on piezoelectricity to convert mechanical energy into usable electricity have received considerable attention. Electrospun fibers from piezoelectric polymers and inorganic nanowires as emerging piezoelectric materials have shown great potential for energy-harvesting applications. This review paper summarizes energy-harvesting technology based on piezoelectric polymeric fibers, inorganic piezoelectric fibers, and inorganic nanowires. A comprehensive overview of fundamentals of piezoelectric effect, types of piezoelectric materials, energy harvesting from fibers, energy harvesting from inorganic nanowires, and energy harvesting from polymeric/inorganic fibers and nanowires composites are discussed.

Design of a Novice Hydraulic Buoyant Force Engine

2014 ◽  
Vol 705 ◽  
pp. 71-78
Author(s):  
N. Mir-Nasiri ◽  
B. Almenov
Keyword(s):  
Alternative Energy ◽  
Fossil Fuels ◽  
Mechanical Energy ◽  
Water Reservoir ◽  
Combustion Products ◽  
Destructive Effect ◽  
Buoyant Force ◽  
Alternative Energy Sources ◽  
Belt Transmission ◽  
The Cost

In connection with the consumptive depletion of the earth and the destructive effect of emissions of combustion products on the environment, now all of humanity is in search for alternative energy sources. The proposed technology intends to produce electricity directly at the consumer location or in close vicinity to it by utilizing the concept of vertical buoyancy power generation in a still water reservoir and thus able to lower the cost of electricity and save the fossil fuels. The newly invented machine is able to converts the buoyance force energy into mechanical energy of shaft rotation, and thus into the electricity via rotary generator. The hydraulic buoyant force engine system includes two cylindrical pulleys with belt transmission mounted on the stationary frame that is submerged into the water. The belt carries the chain of elastic plastic airbags to generate the buoyance force. The empty and weightless airbags are driven first by the belt and pulleys system to the bottom of a water reservoir where they are filled with the air delivered by the compressor and then the bulged bags and thus connected belt are driven up by the buoyant force. As a result the belt and shaft of the connected to the upper pulley generator will be constantly driven by the buoyant force. The paper describes the details of the engine construction, the amount of power generated by the engine as a function of the reservoir depth and the power of an air compressor as well as advantages of such engine installations and their impact on the society.

scholarly journals Pengujian Alat Modifikasi Alternator Mobil Menjadi Listrik Rumah

2019 ◽  
Vol 11 (1) ◽  
pp. 28-32
Author(s):  
Naufal Noverdi ◽  
Eka Sunitra ◽  
Maimuzar Maimuzar
Keyword(s):  
Coming Out ◽  
Alternative Energy ◽  
Mechanical Energy ◽  
Electrical Power ◽  
Electrical Energy ◽  
Energy Sources ◽  
Optimum Conditions ◽  
Fossil Energy ◽  
Final Project ◽  
Alternative Energy Sources

This paper discusses the use of alternator cars into home electricity. This paper aims to overcome the energy crisis by reducing dependence on fossil energy sources by utilizing alternative energy sources or by developing technology in the form of alternator modifications, and also from this paper we can find out the optimum conditions of rotation and generating electricity. The workings of this alternator modification tool so as to produce electrical power that is using a motor as a drive connected to the alternator produced mechanical energy converted into electrical energy and from this alternator a voltage of 12 volts comes out and goes into travo to increase the voltage to 220 Volts. From the results of the testing of this final project, the effect of rotation on the production of electrical energy coming out on this alternator modification tool is if the rotation produced is high then the power output is also good and if the rotation is slowed the power coming out will also be small. The optimum condition of this test is at 1600rpm. Key words: keywords are written in 5 words which should be a subset of paper titles, written using lowercase letters except for abbreviations, and separated by comma punctuation for between words.

scholarly journals Comparative Analysis of Modelling for Piezoelectric Energy Harvesting Solutions

2021 ◽  
Vol 3 (2) ◽  
pp. 138-153
Author(s):  
Jennifer S Raj ◽  
G Ranganathan
Keyword(s):  
Energy Harvesting ◽  
Alternative Energy ◽  
Piezoelectric Materials ◽  
Mechanical Energy ◽  
Renewable Energy Sources ◽  
Energy Systems ◽  
Piezoelectric Energy ◽  
Research Article ◽  
Piezoelectric Elements ◽  
Harvesting Techniques

Due to the global energy crisis and environmental degradation, largely as a result of the increased usage of non-renewable energy sources, researchers have become more interested in exploring alternative energy systems, which may harvest energy from natural sources. This research article provides a comparison between various modeling of piezoelectric elements in terms of power generation for energy harvesting solutions. The energy harvesting can be computed and calculated based on piezoelectric materials and modeling for the specific application. The most common type of environmental energy that may be collected and transformed into electricity for several purposes is Piezoelectric transduction, which is more effective, compared to other mechanical energy harvesting techniques, including electrostatic, electromagnetic, and triboelectric transduction, due to their high electromechanical connection factor and piezoelectric coefficients. As a result of this research, scientists are highly interested in piezoelectric energy collection.

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