Zobrazeno 1 - 10
of 112
pro vyhledávání: '"Werner Wirges"'
Autor:
Xunlin Qiu, Peng Fang, Axel Mellinger, Ruy Alberto Pisani Altafim, Werner Wirges, Gunnar Gidion, Dmitry Rychkov
Publikováno v:
Journal of Advanced Dielectrics, Vol 13, Iss 04 (2023)
Nowadays, the demand for advanced functional materials in transducer technology is growing rapidly. Piezoelectric materials transform mechanical variables (displacement or force) into electrical signals (charge or voltage) and vice versa. They are in
Externí odkaz:
https://doaj.org/article/d205a7809a86460d8ed687414afaf369
Autor:
Joao P. do Carmo, Dmitry Rychkov, Yuri Andrey Olivato Assagra, Ruy Alberto Pisani Altafim, Werner Wirges, Ruy Alberto Corrêa Altafim, Reimund Gerhard
Publikováno v:
IEEE Transactions on Dielectrics and Electrical Insulation. 27:1668-1674
Here, a promising approach for producing piezo-polymer transducers in a one-step process is presented. Using 3D-printing technology and polypropylene (PP) filaments, we are able to print a two-layered film structure with regular cavities of precisely
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9f7c40abba77ea0d6c66ad2d4321cb50
https://doi.org/10.1109/tdei.2020.008461
https://doi.org/10.1109/tdei.2020.008461
Poly(vinylidene fluoride-trifluoroethylene) (P(VDF-TrFE)) copolymers, probably the most often used electro-active polymers, are rendered ferro-, pyro-, and piezoelectric via poling under high electric fields. Uniform polarization profiles across the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c40469d27e88856b209108be79f52791
https://lirias.kuleuven.be/handle/123456789/681123
https://lirias.kuleuven.be/handle/123456789/681123
Publikováno v:
IEEE Transactions on Dielectrics and Electrical Insulation. 25:829-834
Polymer foams are in industrial use for several decades. More recently, non-polar polymer foams were found to be piezoelectric (so-called piezoelectrets) after internal electrical charging of the cavities. So far, few studies have been carried out on
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::435324dd8bc7ecb56deffb69dcbcd025
https://doi.org/10.1109/tdei.2018.007192
https://doi.org/10.1109/tdei.2018.007192
Autor:
Matthias Kollosche, Wilhelm Kossack, Werner Wirges, Reimund Gerhard, Lars Holländer, Friedrich Kremer
Publikováno v:
Liquid Crystals. 43:1514-1521
Polymer-dispersed liquid crystals (PDLCs) of ferroelectric poly(vinylidene fluoride-trifluoroethylene) and nematic 4-cyano-4ʹ-n-hexylbiphenyl (6CB) or 4-cyano-4ʹ-n-pentylbiphenyl (5CB) were prepared to study the effect of the remanent polarisation
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f7163aefdddff4e5cae54da3b987fa5b
https://doi.org/10.1080/02678292.2016.1185174
https://doi.org/10.1080/02678292.2016.1185174
Publikováno v:
Ferroelectrics. 472:100-109
Polarization-vs.-applied-voltage hysteresis curves are recorded on tubular-channel fluoroethylene-propylene (FEP) copolymer ferroelectrets by means of a modified Sawyer-Tower circuit. Dielectric barrier discharges (DBDs) inside the cavities are trigg
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::99bdabece1bd983d2c9581e3720307e3
https://doi.org/10.1080/00150193.2014.964603
https://doi.org/10.1080/00150193.2014.964603
Autor:
Quyet D. Nguyen, Reimund Gerhard, Yuriy V. Serdyuk, Werner Wirges, Anh T. Hoang, Stanislaw Gubanski
Publikováno v:
2016 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP).
Polyethylene doped with nanoparticles of inorganic oxides has been studied extensively during the last decade, aiming at its possible use as suitable material in insulation of high voltage direct current cables. To elucidate electrical properties of
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0ed2c8eed1fbd3c531dbd328f54b9416
https://doi.org/10.1109/ceidp.2016.7785595
https://doi.org/10.1109/ceidp.2016.7785595
Publikováno v:
2016 IEEE International Conference on Dielectrics (ICD).
Polymer foams and polymer-film systems with internal cavities are highly compressible, at least in certain direction(s). Their Young's moduli can be several orders of magnitude lower than those of the respective non-porous (essentially cavity-free) m
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6ff26e29e1720dbdb7d72f0d6c540cdd
https://doi.org/10.1109/icd.2016.7547755
https://doi.org/10.1109/icd.2016.7547755
The influence of the temperature in the gas-filled cavities on the charging process of ferroelectret film systems has been studied in hysteresis measurements. The threshold voltage and the effective polarization of the ferroelectrets were determined
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d9fd4d8c7adee4afd91064e977df8acc
https://publishup.uni-potsdam.de/frontdoor/index/index/docId/45224
https://publishup.uni-potsdam.de/frontdoor/index/index/docId/45224
Autor:
Reimund Gerhard, Dmitry Rychkov, Ruy Alberto Corrêa Altafim, Werner Wirges, Ruy Alberto Pisani Altafim, M. Melzer, H.C. Basso
Publikováno v:
IEEE Transactions on Dielectrics and Electrical Insulation. 19:1116-1123
A template-based lamination technique for the manufacture of ferroelectrets from uniform electret films was recently reported. In the present work, this technique is used to prepare similar ferroelectret structures from low-density polyethylene (LDPE
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::dc54d9b241e67bd0bcf349ee62483d1d
https://doi.org/10.1109/tdei.2012.6259978
https://doi.org/10.1109/tdei.2012.6259978