Nucleation of electroactive β-phase poly(vinilidene fluoride) with CoFe2O4 and NiFe2O4 nanofillers: a new method for the preparation of multiferroic nanocomposites

Multifunctional nanocomposites of poly(vinylidene fluoride) reinforced by carbon nanotubes and magnetite nanoparticles

“…to ! phase transformation in PVDF matrix [28,29]. From these results it seems that it is mainly CNT that promote the formation of phase in PVDF nanocomposites, while the influence of Fe 3 O 4 is less but not insignificant.…”

Temperature and frequency dependence of the dielectric and piezoelectric response of P(VDF–TrFE)/CoFe2O4 magnetoelectric composites

“…PVDF-TrFE has the well-known relaxation which is related to the micro Brownian cooperative motions of the main chain backbone and is a dielectric manifestation of the glass transition temperature of PVDF and PVDF-TrFE copolymers [19][20][21]. In addition, earlier works showed that the crystallinity content of PVDF-based composites varies with the filler type and content [22]. One would expect that the dynamics of such systems should alter as well.…”

Magnetoelectric CoFe2O4/polyvinylidene fluoride electrospun nanofibres

“…CFO nanoparticle content has no significant impact on the nanofibre average diameter [ Figure 1 (a-d)]. The CFO/PVDF nanofibres show a strong enhancement in the volume fraction of electroactive β phase F β [11,12] when compared to pure PVDF electrospun nanofibers [ Figure 1(e) and (f)], as the interaction between the negatively charged surface of the CFO nanoparticles (whose zeta potential is -22 mV) and the positively charged polymer CH 2 groups promotes nucleation of the polar β phase, as seen in CFO/PVDF films [10]. The increase in β phase volume fraction is also assisted by the low evaporation temperature of the solvent (≤ 60 o C) and the stretching that occurs during jet formation [13].…”

“…Fourier transform infrared spectroscopy (FTIR) [6,10], performed using a Jasco FT/IR-4100 type A that was operated in attenuated total reflectance mode, with 2 cm -1 resolution. .…”