|
1
|
Kaspar P, Sobola D, Částková K, Knápek A, Burda D, Orudzhev F, Dallaev R, Tofel P, Trčka T, Grmela L, Hadaš Z. Characterization of Polyvinylidene Fluoride (PVDF) Electrospun Fibers Doped by Carbon Flakes. Polymers (Basel) 2020; 12:E2766. [PMID: 33255198 PMCID: PMC7760733 DOI: 10.3390/polym12122766] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2020] [Revised: 11/18/2020] [Accepted: 11/21/2020] [Indexed: 12/23/2022] Open
Abstract
Polyvinylidene fluoride (PVDF) is a modern polymer material used in a wide variety of ways. Thanks to its excellent resistance to chemical or thermal degradation and low reactivity, it finds use in biology, chemistry, and electronics as well. By enriching the polymer with an easily accessible and cheap variant of graphite, it is possible to affect the ratio of crystalline phases. A correlation between the ratios of crystalline phases and different properties, like dielectric constant as well as piezo- and triboelectric properties, has been found, but the relationship between them is highly complex. These changes have been observed by a number of methods from structural, chemical and electrical points of view. Results of these methods have been documented to create a basis for further research and experimentation on the usability of this combined material in more complex structures and devices.
Collapse
Affiliation(s)
- Pavel Kaspar
- Department of Physics, Faculty of Electrical Engineering and Communication, Brno University of Technology, Technická 2848/8, 616 00 Brno, Czech Republic; (P.K.); (D.S.); (D.B.); (R.D.); (P.T.); (T.T.); (L.G.)
| | - Dinara Sobola
- Department of Physics, Faculty of Electrical Engineering and Communication, Brno University of Technology, Technická 2848/8, 616 00 Brno, Czech Republic; (P.K.); (D.S.); (D.B.); (R.D.); (P.T.); (T.T.); (L.G.)
- Central European Institute of Technology BUT, Purkyňova 123, 612 00 Brno, Czech Republic;
- Department of Inorganic Chemistry and Chemical Ecology, Dagestan State University, Makhachkala, St. M. Gadjieva 43-a, 367015 Dagestan Republic, Russia;
| | - Klára Částková
- Central European Institute of Technology BUT, Purkyňova 123, 612 00 Brno, Czech Republic;
- Department of Ceramics and Polymers, Faculty of Mechanical Engineering, Brno University of Technology, Technická 2, 616 69 Brno, Czech Republic
| | - Alexandr Knápek
- Institute of Scientific Instruments of the Czech Academy of Sciences, Královopolská 147, 612 64 Brno, Czech Republic
| | - Daniel Burda
- Department of Physics, Faculty of Electrical Engineering and Communication, Brno University of Technology, Technická 2848/8, 616 00 Brno, Czech Republic; (P.K.); (D.S.); (D.B.); (R.D.); (P.T.); (T.T.); (L.G.)
- Institute of Scientific Instruments of the Czech Academy of Sciences, Královopolská 147, 612 64 Brno, Czech Republic
| | - Farid Orudzhev
- Department of Inorganic Chemistry and Chemical Ecology, Dagestan State University, Makhachkala, St. M. Gadjieva 43-a, 367015 Dagestan Republic, Russia;
| | - Rashid Dallaev
- Department of Physics, Faculty of Electrical Engineering and Communication, Brno University of Technology, Technická 2848/8, 616 00 Brno, Czech Republic; (P.K.); (D.S.); (D.B.); (R.D.); (P.T.); (T.T.); (L.G.)
| | - Pavel Tofel
- Department of Physics, Faculty of Electrical Engineering and Communication, Brno University of Technology, Technická 2848/8, 616 00 Brno, Czech Republic; (P.K.); (D.S.); (D.B.); (R.D.); (P.T.); (T.T.); (L.G.)
- Central European Institute of Technology BUT, Purkyňova 123, 612 00 Brno, Czech Republic;
| | - Tomáš Trčka
- Department of Physics, Faculty of Electrical Engineering and Communication, Brno University of Technology, Technická 2848/8, 616 00 Brno, Czech Republic; (P.K.); (D.S.); (D.B.); (R.D.); (P.T.); (T.T.); (L.G.)
| | - Lubomír Grmela
- Department of Physics, Faculty of Electrical Engineering and Communication, Brno University of Technology, Technická 2848/8, 616 00 Brno, Czech Republic; (P.K.); (D.S.); (D.B.); (R.D.); (P.T.); (T.T.); (L.G.)
- Central European Institute of Technology BUT, Purkyňova 123, 612 00 Brno, Czech Republic;
| | - Zdeněk Hadaš
- Faculty of Mechanical Engineering, Brno University of Technology, Technická 2896/2, 616 69 Brno, Czech Republic;
| |
Collapse
|
|
2
|
von Reppert A, Willig L, Pudell JE, Zeuschner SP, Sellge G, Ganss F, Hellwig O, Arregi JA, Uhlíř V, Crut A, Bargheer M. Spin stress contribution to the lattice dynamics of FePt. Sci Adv 2020; 6:eaba1142. [PMID: 32685678 PMCID: PMC7343378 DOI: 10.1126/sciadv.aba1142] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/05/2019] [Accepted: 05/22/2020] [Indexed: 06/07/2023]
Abstract
Invar-behavior occurring in many magnetic materials has long been of interest to materials science. Here, we show not only invar behavior of a continuous film of FePt but also even negative thermal expansion of FePt nanograins upon equilibrium heating. Yet, both samples exhibit pronounced transient expansion upon laser heating in femtosecond x-ray diffraction experiments. We show that the granular microstructure is essential to support the contractive out-of-plane stresses originating from in-plane expansion via the Poisson effect that add to the uniaxial contractive stress driven by spin disorder. We prove the spin contribution by saturating the magnetic excitations with a first laser pulse and then detecting the purely expansive response to a second pulse. The contractive spin stress is reestablished on the same 100-ps time scale that we observe for the recovery of the ferromagnetic order. Finite-element modeling of the mechanical response of FePt nanosystems confirms the morphology dependence of the dynamics.
Collapse
Affiliation(s)
- A. von Reppert
- Institute of Physics and Astronomy, University of Potsdam, Karl-Liebknecht-Str. 24-25, 14476 Potsdam, Germany
| | - L. Willig
- Institute of Physics and Astronomy, University of Potsdam, Karl-Liebknecht-Str. 24-25, 14476 Potsdam, Germany
- Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Wilhelm-Conrad-12 Röntgen Campus, BESSY II, Albert-Einstein-Str. 15, 12489 Berlin, Germany
| | - J.-E. Pudell
- Institute of Physics and Astronomy, University of Potsdam, Karl-Liebknecht-Str. 24-25, 14476 Potsdam, Germany
- Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Wilhelm-Conrad-12 Röntgen Campus, BESSY II, Albert-Einstein-Str. 15, 12489 Berlin, Germany
| | - S. P. Zeuschner
- Institute of Physics and Astronomy, University of Potsdam, Karl-Liebknecht-Str. 24-25, 14476 Potsdam, Germany
- Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Wilhelm-Conrad-12 Röntgen Campus, BESSY II, Albert-Einstein-Str. 15, 12489 Berlin, Germany
| | - G. Sellge
- Institut für Physik, Technische Universität Chemnitz, Reichenhainer Str. 70, 09126 Chemnitz, Germany
- Institut für Ionenstrahlphysik und Materialforschung, Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstrasse 400, 01328 Dresden, Germany
| | - F. Ganss
- Institut für Physik, Technische Universität Chemnitz, Reichenhainer Str. 70, 09126 Chemnitz, Germany
| | - O. Hellwig
- Institut für Physik, Technische Universität Chemnitz, Reichenhainer Str. 70, 09126 Chemnitz, Germany
- Institut für Ionenstrahlphysik und Materialforschung, Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstrasse 400, 01328 Dresden, Germany
| | - J. A. Arregi
- CEITEC BUT, Brno University of Technology, Purkyňova 123, 612 00 Brno, Czechia
| | - V. Uhlíř
- CEITEC BUT, Brno University of Technology, Purkyňova 123, 612 00 Brno, Czechia
- Institute of Physical Engineering, Brno University of Technology, Technická 2, 616 69 Brno, Czechia
| | - A. Crut
- FemtoNanoOptics Group, Institut Lumière Matière, Université de Lyon, CNRS-Université Lyon 1, 69622 Villeurbanne, France
| | - M. Bargheer
- Institute of Physics and Astronomy, University of Potsdam, Karl-Liebknecht-Str. 24-25, 14476 Potsdam, Germany
- Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Wilhelm-Conrad-12 Röntgen Campus, BESSY II, Albert-Einstein-Str. 15, 12489 Berlin, Germany
| |
Collapse
|