| People | Locations | Statistics |
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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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Saarimaki, Eetta
VTT Technical Research Centre of Finland
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (22/22 displayed)
- 2024Screening of suitable random copolymer polypropylene blends for HVDC cable insulationcitations
- 2023Molecular Layer Deposition of Polyurea on Silica Nanoparticles and Its Application in Dielectric Nanocompositescitations
- 2023Nano-scale nonwoven fabrics by electrospinning of polylactic acid
- 2021Dielectric performance of silica-filled nanocomposites based on miscible (PP/PP-HI) and immiscible (PP/EOC) polymer blendscitations
- 2021Dielectric Performance of Silica-Filled Nanocomposites Based on Miscible (PP/PP-HI) and Immiscible (PP/EOC) Polymer Blendscitations
- 2021Combining good dispersion with tailored charge trapping in nanodielectrics by hybrid functionalization of silicacitations
- 2021Deposition of Ureido and Methacrylate Functionalities onto Silica Nanoparticles and Its Effect on the Properties of Polypropylene-Based Nanodielectricscitations
- 2021PP/PP-HI/silica nanocomposites for HVDC cable insulationcitations
- 2020Silica surface modification with liquid rubbers & functional groups for new polyolefin-based dielectric nano-composites
- 2020Influence of polar and unpolar silica functionalization on the dielectric properties of PP/POE nanocompositescitations
- 2020Feasibility of Mini-Scale Injection Molding for Resource-Efficient Screening of PP-Based Cable Insulation Nanocompositescitations
- 2020Silica Functionalization: How Does it Affect Space Charge Accumulation in Nanodielectrics Under DC?
- 2020From Laboratory to Industrial Scalecitations
- 2019Silica-Polypropylene Nanocomposites for Film Capacitorscitations
- 2018Airborne Dust from Mechanically Recycled Cotton during Ring Spinning
- 2015Novel thermographic inspection method to detect the moisture in early stage of the water ingress and a procedure to remove the moisture from the composite structure
- 2013New high-quality mined nanomaterials mass produced for plastic and wood-plastic nanocomposites
- 2013PVC-wood composite
- 2009Development of thermographic inspection routine exploiting phase transition of water for moisture detection in aircraft structurescitations
- 2006Novel heat durable electromechanical filmcitations
- 2005Novel heat durable electromechanical filmscitations
- 2005Novel heat durable electromechanical film processingcitations
Places of action
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document
Novel heat durable electromechanical film processing
Abstract
New heat durable electromechanical films from cyclo-olefin polymers have been developed. Electromechanical film can act as a sensor and as an actuator. As a sensor dynamic force on the surface of the film generates electric charge and contrary as an actuator voltage is applied to the film and the electric field drives the film in an air gap producing acoustic sound (or vibration). Electromechanical operation and electret operation are possible for both application types. Electromechanical operation is based on the changes of the thickness of the film and electret operation is based on the movement of the film between the air gap. The application properties strongly depend on the preparations made to the film. The film preparations consist of stretching (void formation), gas diffusion expansion, electrostatic charging, fabrication of metal electrodes, making electrical connections and tensioning on a frame in electret operation. Cast film needs to be stretched to form voided structure to the film. Processing window for the stretching of the heat durable electromechanical films is very narrow compared to the PP-based films. Optimal voids in the film microstructure are flat and lens like. Gas diffusion expansion increases the film softness and thus the electromechanical sensitivity by further opening the cellular microstructure. Maximum film thickness is about 100 /spl mu/m prior to the electrostatic charging. Charges applied to the film trap into the plastic-gas interfaces and form permanent space charges in the film. Partial discharges are being controlled by a constant current charging method. Metal electrodes are applied to the film and further connected by leads to operating systems and amplifiers. The sensitivity of the electromechanically operating sensors and actuators can be increased by stacking multiple layers of the film together. Applications based on a flat loudspeaker need to be tuned by tensioning the film on a support frame. Correct tensioning is essential in reducing distortion levels. In general lower tensioning leads to higher sound pressure levels due to the larger film movement but on the other hand higher tensioning reduces the distortion levels.