Abstract
In the present study, the effect of size distribution of magnetite nanoparticles in a PVDF matrix on the magnetic properties of PVDF + Fe3O4 nanocomposites was experimentally and theoretically investigated. The size distribution of nanoparticles in polymer matrix and morphology of the nanocomposites were studied by the means of scanning electron microscopy and atomic force microscopy. It was found that when the Fe3O4 nanoparticles are introduced into the polymer matrix, their coagulation takes place. The increase in the size of the particles depends on their concentration in the polymer matrix, the type of polymer (polar, non-polar, its viscosity, etc.), reaction temperatures, etc. In addition, when Fe3O4 nanoparticles are introduced into the polymer network, the oxidation of the surface layer of particles occurs and the magnetic size decreases. Consequently, the reduced magnetic properties may also be observed. The hysteresis loops have been recorded in small magnetic field range. It was found that the magnetic hysteresis parameters depend on the size and concentration of Fe3O4 nanoparticles. Theoretical calculations were compared with experimental results obtained from M(H) measurements. The reasons of differences between theoretical and experimental results have been explained.
Highlights
Magnetic nanomaterials are drawing increased attention due to their remarkable physical properties
Theoretical calculations were compared with experimental results obtained from M(H) measurements
It was found that when the Fe3O4 particles are introduced into the polymer matrix, their coagulation takes place
Summary
Magnetic nanomaterials are drawing increased attention due to their remarkable physical properties. The combination of different materials allows to make completely new composite materials with a wide range of functional properties: mechanical, chemical, electrical, magnetic, optical and many others [3]. The formation of unique properties of polymer-based magnetic nanocomposites depends on many factors such as particles size and shape, degree of dispersion, concentration. The determination of the size of the Fe3O4 nanoparticles before and after their introduction into the polymer matrix has been investigated in our early works [4]. The change in nanoparticle size depends on the type of polymer
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