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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Wegener, Martin
Karlsruhe Institute of Technology
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (33/33 displayed)
- 2024Intrinsically Thermally Degradable Microstructures Fabricated by Photodimerization in Rapid 3D Laser Printing
- 2024Anomalous frozen evanescent phonons
- 2023Observation of Chirality‐Induced Roton‐Like Dispersion in a 3D Micropolar Elastic Metamaterialcitations
- 2023Tetramode Metamaterials as Phonon Polarizerscitations
- 2023Tetramode Metamaterials as Phonon Polarizerscitations
- 2023Deconstructing 3D Structured Materials by Modern Ultramicrotomy for Multimodal Imaging and Volume Analysis across Length Scalescitations
- 2023Deconstructing 3D Structured Materials by Modern Ultramicrotomy for Multimodal Imaging and Volume Analysis across Length Scales
- 2023Dispersion Engineering by Hybridizing the Back‐Folded Soft Mode of Monomode Elastic Metamaterials with Stiff Acoustic Modes
- 2023Laser printed microelectronicscitations
- 2021Enzyme-degradable 3D multi-material microstructurescitations
- 2021Cubic metamaterial crystal supporting broadband isotropic chiral phonons
- 2021Multi-material multi-photon 3D laser micro- and nanoprinting
- 2020Isotropic Chiral Acoustic Phonons in 3D Quasicrystalline Metamaterials
- 2020Rapid Assembly of Small Materials Building Blocks (Voxels) into Large Functional 3D Metamaterialscitations
- 2019Controlling the shape of 3D microstructures by temperature and lightcitations
- 2019Two in one: Light as a tool for 3D printing and erasing at the microscalecitations
- 2019Ultrasound experiments on acoustical activity in chiral mechanical metamaterialscitations
- 2019Tailoring the mechanical properties of 3D microstructures using visible light post-manufacturingcitations
- 2018A subtractive photoresist platform for micro- and macroscopic 3D printed structurescitations
- 2018Roadmap on transformation opticscitations
- 20173D Fluorescence-Based Security Features by 3D Laser Lithographycitations
- 2017Experimental Evidence for Sign Reversal of the Hall Coefficient in Three-Dimensional Metamaterialscitations
- 2017Experiments on the Parallel Hall Effect in Three-Dimensional Metamaterials
- 2017Three-dimensional mechanical metamaterials with a twist
- 2017Cleaving direct-laser-written microstructures on demandcitations
- 2017All-Angle Invisibility Cloaking of Contact Fingers on Solar Cells by Refractive Free-Form Surfacescitations
- 2016Fabrication of conductive 3D gold-containing microstructures via direct laser writingcitations
- 2016Design of broadband SERS substrates by the laser-induced aggregation of gold nanoparticlescitations
- 2016Simultaneous dual encoding of three-dimensional structures by light-induced modular ligationcitations
- 2015Designing pi-Conjugated Polymeric Nano- and Microstructures via Light Induced Chemistrycitations
- 2014Fabrication and spatially resolved functionalization of 3D microstructures via multiphoton-induced Diels-Alder chemistrycitations
- 2013Preparation of reactive three-dimensional microstructures via direct laser writing and thiol-ene chemistrycitations
- 2006Elastic properties and electromechanical coupling factor of inflated polypropylene ferroelectretscitations
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document
Elastic properties and electromechanical coupling factor of inflated polypropylene ferroelectrets
Abstract
Closed-cell polymer-foam electrets with internal bipolar charge exhibit strong longitudinal piezoelectricity. The size and the shape of their internal voids can be controlled by means of an inflation process that consists of a high-pressure treatment followed by a heat-setting procedure. Experimental data reveal a maximum of the piezoelectric coefficient and of the electromechanical coupling factor as functions of the polymer-foam density. These and related experimental results are discussed within a simplified model for polymer foams. The piezoelectric d33 coefficient and the respective coupling factor k33 are calculated by means of a series-connection model for cellular polymers. In the model, the piezoelectric coefficient and the coupling factor can be expressed in terms of the charge density on the respective void surface, the relative dielectric permittivity, the effective Young's modulus and the relative density of the foam. The effective Young's modulus is in turn determined by means of a truss-like mechanical model of the polymer foam. The model yields qualitative agreement with the experimentally observed data.