Voided polymer electrets - new materials, new challenges, new chances

Gerhard, Reimund

doi:10.1109/ise.2002.1042939

Cited by 20 publications

(25 citation statements)

References 51 publications

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“…Polypropylene is one of the pioneer materials used in the piezoelectrets. Piezoelectricity and pyroelectricity found in polypropylene space-charge electrets are explained by two near-surface charge layers of opposite polarity and by non-centrosymmetric trapping sites, respectively [ 41 , 42 ]. Good piezoelectric properties of porous polytetrafluoroethylene (PTFE) films and nonporous fluoroethylene propylene (FEP) have been already reported [ 43 ].…”

Section: Polymer Based Substratesmentioning

confidence: 99%

Piezoelectric Polymer and Paper Substrates: A Review

Sappati

Bhadra

2018

Sensors

234

140

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Polymers and papers, which exhibit piezoelectricity, find a wide range of applications in the industry. Ever since the discovery of PVDF, piezo polymers and papers have been widely used for sensor and actuator design. The direct piezoelectric effect has been used for sensor design, whereas the inverse piezoelectric effect has been applied for actuator design. Piezo polymers and papers have the advantages of mechanical flexibility, lower fabrication cost and faster processing over commonly used piezoelectric materials, such as PZT, BaTiO3. In addition, many polymer and paper materials are considered biocompatible and can be used in bio applications. In the last 20 years, heterostructural materials, such as polymer composites and hybrid paper, have received a lot of attention since they combine the flexibility of polymer or paper, and excellent pyroelectric and piezoelectric properties of ceramics. This paper gives an overview of piezoelectric polymers and papers based on their operating principle. Main categories of piezoelectric polymers and papers are discussed with a focus on their materials and fabrication techniques. Applications of piezoelectric polymers and papers in different areas are also presented.

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Section: Polymer Based Substratesmentioning

confidence: 99%

Piezoelectric Polymer and Paper Substrates: A Review

Sappati

Bhadra

2018

Sensors

234

140

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“…It was also observed that although the foam showed resonant behaviour at other frequency range within 5 kHz -20 kHz, a sharp resonant behaviour is easily obtained at 11 kHz. Comparing this with other developed cellular electrets clear shows that EFOAM produces a higher sensitivity since that obtained from EMFIT was shown to be of the order 225±25pm/V [7] and voided singlefilm PTFE showed 600pm/V [8] and cellular polypropylene displayed 100 -210pm/V [9].…”

Section: Fig8 Frequency and Amplitude Response Of The Efoam Samplementioning

confidence: 66%

Studies on Electromechanical foam material (EFOAM) as a potential Sensor and Actuator

Omoniyi¹,

Fagbohun²

2014

IOSRJEEE

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A novel electromechanical foam (EFOAM) material capable of acting as an electromechanical transducer with integrated functions as a sensoractuator is investigated by manufacturing some samples of the foam and performing some tests, based on the piezo-electric effect in electro-active polymers. The resulting charge, when different known weights are applied to the sample were observed and recorded with a charge amplifier while the actuator sensitivity was also estimated using the micro-scanning laser Doppler vibrometer. EFOAM is manufactured from expancel microspheres and heated by placing the microspheres in glass slides heated up to temperatures of 135 0 C for expansion. Different samples were manufactured and charged using the corona discharge method operating under an electric field of between 11kV/cm to 15kV/cm. EFOAM displayed an electro-mechanical sensitivity of 1nm/V when characterized, and is observed that the piezoelectric nature of EFOAM exists as a characteristic of each cell within the material sample. This novel material offers much promise in the area of production of miniature electromechanical devices which maybe well applied in electroacoustic applications.

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“…The melt is extruded, cooled down and reheated for foam blowing. Foam formation is accompanied by biaxial orientation, which results in disk or lens shaped voids (54) . In addition, most cellular PP foams have co-extruded outer layer of non voided polymer for higher surface smoothness, better thickness uniformity and improved electrode adhesion (55) .…”

Section: Materials Characteristicsmentioning

confidence: 99%

Ceramic Based Intelligent Piezoelectric Energy Harvesting Device

Patel¹

2011

Advances in Ceramics - Electric and Magnetic Ceramics, Bioceramics, Ceramics and Environment

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Voided polymer electrets - new materials, new challenges, new chances

Cited by 20 publications

References 51 publications

Piezoelectric Polymer and Paper Substrates: A Review

Piezoelectric Polymer and Paper Substrates: A Review

Studies on Electromechanical foam material (EFOAM) as a potential Sensor and Actuator

Ceramic Based Intelligent Piezoelectric Energy Harvesting Device

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