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The influence of magnetic field on the acoustic attenuation in MWCNT/Fe3O4

Multi-walled carbon nanotubes (MWCNTs) are in the present very popular and can be functionalized by various types of nanoparticles. In this article are studied functionalized MWCNTs by Fe3O4 magnetic nanoparticles dissolved in transformer oil under the various development of a magnetic flux density for three temperatures. Various types of applications of the magnetic flux density were used: the jump change, the linear increase with a decrease, and the change of direction of the constant field according to an acoustic wave. In all cases, we measured an increase in acoustic attenuation in the presence of a magnetic field. This increase was caused by the creation of structures from MWCNT/Fe3O4. After the turn-off of the magnetic flux density, the acoustic attenuation very fast (less than 30 s) returned to the initial value, which was connected with a short lifetime of the structures. A hysteresis effect at all temperatures was measured at the linear change of the magnetic flux density. The anisotropy measurement confirmed that thick chains from MWCNT/Fe3O4 were created.