Corona Poling Conditions for Barium Titanate/Epoxy Composites and their Unsteady Wind Energy Harvesting Potential

Wang, Zhenjin; Narita, Fumio

doi:10.1002/adem.201900169

Cited by 36 publications

(19 citation statements)

References 13 publications

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“…All of the above-mentioned studies have focused on composite materials in which continuous Fe-Co fibers are embedded in the epoxy or aluminum alloy matrix. However, the flexibility of these composites is not good enough to meet the requirement of wearable applications, hence, it is necessary to develop a lighter and more flexible composite material [18,19].…”

Section: Introductionmentioning

confidence: 99%

Fabrication, Modeling and Characterization of Magnetostrictive Short Fiber Composites

et al. 2020

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Magnetostrictive materials have a wide variety of applications due to their great capability as sensors and energy-harvesting devices. However, their brittleness inhibits their applications as magnetostrictive devices. Recently, we developed a continuous magnetostrictive Fe-Co-fiber-embedded epoxy matrix composite to increase the flexibility of the material. In this study, we fabricated random magnetostrictive Fe-Co short fiber/epoxy composite sheets. It was found that the discontinuous Fe-Co fiber composite sheet has the magnetostrictive properties along the orientation parallel to the length of the sheet. Finite element computations were also carried out using a coupled magneto-mechanical model, for the representative volume element (RVE) of unidirectional aligned magnetostrictive short fiber composites. A simple model of two-dimensional, randomly oriented, magnetostrictive short fiber composites was then proposed and the effective piezomagnetic coefficient was determined. It was shown that the present model is very accurate yet relatively simple to predict the piezomagnetic coefficient of magnetostrictive short fiber composites. This magnetostrictive composite sheet is expected to be used as a flexible smart material.

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Section: Introductionmentioning

confidence: 99%

Fabrication, Modeling and Characterization of Magnetostrictive Short Fiber Composites

et al. 2020

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“…In addition, the poling temperatures were 75 °C for KNN nanoparticles/epoxy and 65 °C for BTO nanoparticles/epoxy, respectively. (13,14) Poling was performed along the thickness direction, and Au electrodes were coated on the upper and lower surfaces using a sputtering machine (SC-701 Mk II, Sanyu Electron Co., Ltd.).…”

Section: Methodsmentioning

confidence: 99%

“…The first approach is to use lead-free piezoceramics such as BTO and potassium sodium niobate (KNN). (13,14) These piezoceramics also have a perovskite structure and show relatively large piezoelectric constants. They have widely been considered as the main alternative piezoceramics to lead-based ones.…”

Section: Introductionmentioning

confidence: 99%

Fabrication and Mechanical Properties of Carbon-fiber-reinforced Polymer Composites with Lead-free Piezoelectric Nanoparticles

Kurita¹,

Wang²,

Nagaoka³

et al. 2020

Sensors and Materials

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Wireless sensor networks (WSNs) are one of the key factors in realizing an Internet of Things (IoT) society. Piezoelectric materials that can convert mechanical energy into electric energy directly are highly promising as energy-harvesting materials for supplying power to wireless sensors. However, it is well known that lead zirconate titanate (PZT), which has the highest piezoelectric performance, is harmful to the environment. Moreover, the high density and brittleness of the piezoceramics hinder the fabrication of a long-life energy-harvesting device. In this study, we fabricated 0-3 structure piezoelectric composite materials consisting of lead-free piezoceramic nanoparticles, epoxy resin, and carbon-fiber-reinforced polymer (CFRP) and evaluated their mechanical properties. The maximum strain energy of the piezoelectric resin/CFRP composites was 20-40% larger than that of piezoelectric/epoxy composites. The maximum stress and flexural modulus of the lead-free piezoelectric potassium sodium niobate (KNN) nanoparticles/CFRP composite were approximately 5-10% larger than those of the barium titanate (BTO) nanoparticles/CFRP composite. Consequently, it is likely that better energy harvesting performance and mechanical properties can be obtained by using KNN nanoparticles than by using BTO nanoparticles.

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“…This mechanism differs from the piezoelectric material. That is, the output voltage of the piezoelectric material is proportional to the electric field amplitude associated with the stress amplitude [3].…”

Section: Theorymentioning

confidence: 99%

“…Piezoelectric materials have been considered as wearable energy harvesting devices [2,3], and mainly integrated into shoes to harvest a large amount of mechanical energy [4,5,6,7,8,9]. For example, Turkman et al have reported 1.4 mW of generated power by the applied mass of 90 kg [9].…”

Section: Introductionmentioning

confidence: 99%

Footstep Energy Harvesting with the Magnetostrictive Fiber Integrated Shoes

et al. 2019

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Wearable energy harvesting devices attract attention as the devices provide electrical power without inhibiting user mobility and independence. While the piezoelectric materials integrated shoes have been considered as wearable energy harvesting devices for a long time, they can lose their energy harvesting performance after being used several times due to their brittleness. In this study, we focused on Fe–Co magnetostrictive materials and fabricated Fe–Co magnetostrictive fiber integrated shoes. We revealed that Fe–Co magnetostrictive fiber integrated shoes are capable of generating 1.2 µJ from 1000 steps of usual walking by the Villari (inverse magnetostrictive) effect. It seems that the output energy is dependent on user habit on ambulation, not on their weight. From both a mechanical and functional point of view, Fe–Co magnetostrictive fiber integrated shoes demonstrated stable energy harvesting performance after being used many times. It is likely that Fe–Co magnetostrictive fiber integrated shoes are available as sustainable and wearable energy harvesting devices.

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Corona Poling Conditions for Barium Titanate/Epoxy Composites and their Unsteady Wind Energy Harvesting Potential

Cited by 36 publications

References 13 publications

Fabrication, Modeling and Characterization of Magnetostrictive Short Fiber Composites

Fabrication, Modeling and Characterization of Magnetostrictive Short Fiber Composites

Fabrication and Mechanical Properties of Carbon-fiber-reinforced Polymer Composites with Lead-free Piezoelectric Nanoparticles

Footstep Energy Harvesting with the Magnetostrictive Fiber Integrated Shoes

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