Název: The role of sonication of polyethyleneoxide solutions containing magnetic nanoparticles on morphology of nanofibrous mats
Autoři: Peer, Petra ; Stěnička, M. ; Filip, Petr ; Pizúrová, Naděžda ; Babayan, V.
Typ dokumentu: Příspěvky z konference
Konference/Akce: International Conference on Nanomaterials - Research & Application /8./, Brno (CZ), 20161019
Rok: 2017
Jazyk: eng
Abstrakt: Properties of the resulting polymer nanofibers are often tailored by sonication technique applied prior or past an electrospinning process. The aim of this contribution is to evaluate morphology of nanofibrous mats formed by poly(ethylene oxide) with distributed magnetic nanoparticles (MNP) (about 20 nm in diameter) in dependence on time of sonication of the used polymer solutions. The solutions were exposed to sonication (intensity 200W, frequency 24 kHz) for 10, 30, and 60 minutes. It was shown that rheological characteristics (viscosity, storage and loss moduli) strongly depend on time of sonication (particularly phase angle) in contrast to electric conductivity and surface tension. For analysis of homogeneous distribution of MNP in polymer solution, the rheological measurements were carried out also in presence of external magnetic field. Magnetorheological efficiency (a relation of corresponding viscosities) was determined for 80, 170, and 255 mT. Consequently, changed rheological characteristics participate significantly in the process of electrospinning and resulting quality of the obtained nanofibrous mats. Qualitative changes were described by\nmeans of scanning electron microscopy (variance of mean diameter of nanofibers), transmission electron microscopy (distribution of MNP within nanofibrous mats). Static magnetic properties were determined by a vibration sample magnetometer. It was shown that even distribution of MNP in the mats can be achieved by mere sonication process without application of external magnetic field during an electrospinning process. However, time of sonication generates a degree of embedding of MNP into individual nanofibers.
Klíčová slova: electrospinning; magnetic nanoparticles; magnetorheology; poly(ethylene oxide); ultrasound
Číslo projektu: ED2.1.00/03.0111
Poskytovatel projektu: GA MŠk
Zdrojový dokument: NANOCON 2016 8th International Conference on Nanomaterials - Research & Application. Conference proceedings, ISBN 978-80-87294-71-0
Poznámka: Související webová stránka: https://www.confer.cz/nanocon/2016/410-the-role-of-sonication-of-peo-solutions-with-magnetic-nanoparticles-on-morphology-of-the-resulting-nanofibrous-mats

Instituce: Ústav pro hydrodynamiku AV ČR (web)
Informace o dostupnosti dokumentu: Dokument je dostupný na vyžádání prostřednictvím repozitáře Akademie věd.
Původní záznam: http://hdl.handle.net/11104/0271266

Trvalý odkaz NUŠL: http://www.nusl.cz/ntk/nusl-295595


Záznam je zařazen do těchto sbírek:
Věda a výzkum > AV ČR > Ústav pro hydrodynamiku
Konferenční materiály > Příspěvky z konference