THE ROLE OF SONICATION OF POLYETHYLENEOXIDE SOLUTIONS CONTAINING MAGNETIC NANOPARTICLES ON MORPHOLOGY OF NANOFIBROUS MATS

1 PEER Petra
Co-authors:
2 STENICKA Martin 1 FILIP Petr 3 PIZUROVA Nadezda 2 BABAYAN Vladimir
Institutions:
1 Institute of Hydrodynamics, Acad. Sci. Czech Republic, Prague, Czech Republic, EU
2 Centre of Polymer Systems, University Institute, Tomas Bata University in Zlín, Czech Republic, EU
3 Institute of Physics of Materials, Acad. Sci. Czech Republic, Brno, Czech Republic, EU
Conference:
8th International Conference on Nanomaterials - Research & Application, Hotel Voronez I, Brno, Czech Republic, EU, October 19th - 21st 2016
Proceedings:
Proceedings 8th International Conference on Nanomaterials - Research & Application
Pages:
20-24
ISBN:
978-80-87294-71-0
ISSN:
2694-930X
Published:
17th March 2017
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
40 views / 17 downloads
Abstract

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 means 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.

Keywords: Ultrasound, poly(ethylene oxide), magnetic nanoparticles, magnetorheology, electrospinning
Scroll to Top