| 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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Kriechbaum, Manfred
European Commission
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (16/16 displayed)
- 2023On The Multiscale Structure and Morphology of PVDF‐HFP@MOF Membranes in The Scope of Water Remediation Applicationscitations
- 2023On The Multiscale Structure and Morphology of PVDF-HFP@MOF Membranes in The Scope of Water Remediation Applicationscitations
- 2023Micelle Formation in Aqueous Solutions of the Cholesterol-Based Detergent Chobimalt Studied by Small-Angle Scattering
- 2023Poly(ethylene oxide)-block-poly(hexyl acrylate) Copolymers as Templates for Large Mesopore Sizes─A Detailed Porosity Analysiscitations
- 2023Lignin-Derived Mesoporous Carbon for Sodium-Ion Batteriescitations
- 2023The Nanostructured Self-Assembly and Thermoresponsiveness in Water of Amphiphilic Copolymers Carrying Oligoethylene Glycol and Polysiloxane Side Chainscitations
- 2023Synthesis and Characterization of Citric Acid-Modified Iron Oxide Nanoparticles Prepared with Electrohydraulic Discharge Treatmentcitations
- 2022Quantitative study on the face shear piezoelectricity and its relaxation in uniaxially-drawn and annealed poly-l-lactic acidcitations
- 2021Stable aqueous dispersions of bare and double layer functionalized superparamagnetic iron oxide nanoparticles for biomedical applicationscitations
- 2021Folic acid conjugation of magnetite nanoparticles using pulsed electrohydraulic dischargescitations
- 2020The Structural Integrity of the Model Lipid Membrane during Induced Lipid Peroxidationcitations
- 2018Synthesis and in vivo investigation of therapeutic effect of magnetite nanofluids in mouse prostate cancer model
- 2018High Hydrostatic Pressure Induces a Lipid Phase Transition and Molecular Rearrangements in Low-Density Lipoprotein Nanoparticlescitations
- 2018Mesostructure and physical properties of aqueous mixtures of the ionic liquid 1-ethyl-3-methyl imidazolium octyl sulfate doped with divalent sulfate salts in the liquid and the mesomorphic statescitations
- 2018Guerbet glycolipids from mannosecitations
- 2014Order vs. disorder — a huge increase in ionic conductivity of nanocrystalline LiAlO2 embedded in an amorphous-like matrix of lithium aluminatecitations
Places of action
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article
Quantitative study on the face shear piezoelectricity and its relaxation in uniaxially-drawn and annealed poly-l-lactic acid
Abstract
<p>Piezoelectric resonance spectroscopy was used to evaluate the face shear piezoelectricity and its relaxation for structurally controlled poly-L-lactic acid (PLLA) films. We prepared samples by uniaxial drawing at 80 °C for a ratio of 2–6 and annealed at temperatures above glass transition (T<sub>g</sub> = 60 °C) to below melting (T<sub>m</sub> = 170 °C) for 1 hour. The degrees of crystallinity X<sub>c</sub> and orientation F<sub>c</sub> by X-ray diffraction were controlled over a broad range to reach X<sub>c</sub> = 0.8 and F<sub>c</sub> = 0.9. We measured broadband dielectric spectra where the piezoelectric resonance was observed superimposed on dielectric relaxation. Analyses of the resonance spectra for 45°-cut square sample resulted in the determination of the face-shear piezoelectric constants e<sub>14</sub> and d<sub>14</sub>, as well as the elastic shear compliance s<sub>44</sub> and stiffness c<sub>44</sub>. At room temperature, e<sub>14</sub> was shown to be proportional to a product of X<sub>c</sub>*F<sub>c</sub>, whereas d<sub>14</sub> demonstrated saturation due to an increase in c<sub>44</sub>. By extrapolating to X<sub>c</sub>*F<sub>c</sub> = 1, the e<sub>14</sub><sup>c</sup> = 27 mC/m<sup>2</sup> of PLLA crystal was determined. As the temperature increases, piezoelectric relaxation due to non-crystalline segmental motion was observed as well as dielectric and elastic relaxation. It was found that e<sub>14</sub> decreased in a similar manner to c<sub>44</sub> whereas d<sub>14</sub> increased slightly with increasing temperature. The temperature dispersions of e<sub>14</sub>, d<sub>14</sub> and c<sub>44</sub> were reproduced using an equivalent three-spring model consisting of a crystalline piezoelectric spring connected by series and parallel non-crystalline relaxational springs based on the temperature-frequency reduction rule and the VTF-type dielectric relaxation time. The findings revealed key information on the ratio of noncrystalline phases connected in series and parallel to the oriented crystalline phase.</p>