Dielectric and magnetic properties of ferrite/poly(vinylidene fluoride) nanocomposites

Martins, P.; Costa, Carlos M.; Botelho, Gabriela; Lanceros‐Méndez, S.; Barandiarán, J.M.; Gutiérrez, J.

doi:10.1016/j.matchemphys.2011.10.037

Cited by 136 publications

(69 citation statements)

References 31 publications

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“…Earlier publication on these composites showed that the imaginary part maximum of dielectric permittivity follows Vogel-Fulcher (VF) law [10]. The activation energies obtained from the fits are one order of magnitude lower than the ones we obtained from the mean relaxation times.…”

Section: Dielectric Spectroscopycontrasting

confidence: 49%

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Dielectric relaxation and ferromagnetic resonance in magnetoelectric (Polyvinylidene-fluoride)/ferrite composites

et al. 2015

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In this work the dielectric properties and ferromagnetic resonance of Polyvinylidene-fluoride embedded with 10 wt. % of NiFe 2 O 4 or Ni 0.5 Zn 0.5 Fe 2 O 4 nanoparticles are presented. The mechanisms of the dielectric relaxation in these two composites do not differ from each other. For more precise characterization of the dielectric relaxation, a two dimensional distribution of relaxation times was calculated from the temperature dependencies of the complex dielectric permittivity. The results obtained from the 2D distribution and the mean relaxation time are found to be consistent. The dynamics of the dielectric permittivity is described by the Arrhenius law. The energy and attempt time of the dielectric relaxators lie in a narrow energy and time region thus proving that the single type chains of polymer are responsible for a dispersion. The magnetic properties of the composites were investigated using the ferromagnetic resonance. A single resonance line was observed for both samples. From the temperature dependence (100 K -310 K) of the resonance field and linewidth, the origin of the observed line was attributed to the NiFe 2 O 4 and Ni 0.5 Zn 0.5 Fe 2 O 4 superparamagnetic nanoparticles. By the external magnetic field, the angular dependence of the resonance was observed, indicating the magnetic dipolar in-plane interactions.

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Section: Dielectric Spectroscopycontrasting

confidence: 49%

“…The dielectric properties of the ME composites have a huge influence on their performance in technological applications [10]. In particular, in the area of communications and microwave devices, the dielectric response must be well characterized and optimized up to GHz frequencies [3].…”

Section: Introductionmentioning

confidence: 99%

Dielectric relaxation and ferromagnetic resonance in magnetoelectric (Polyvinylidene-fluoride)/ferrite composites

et al. 2015

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“…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.…”

Section: Ftir Measurementsmentioning

confidence: 82%

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

Tsonos¹,

Pandis²,

Soin³

et al. 2015

Express Polym. Lett.

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“…Different fillers have been added to the PVDF polymer matrix such as barium titanate [8], lead-zinconate-titanate [8] and ferrites [9], among others, in order to enhance the dielectric and piezoelectric responses and/or to introduce magnetic and magnetoelectric response, respectively. A less used and very promising filler for electroactive materials are zeolites, microporous crystalline aluminosilicates formed by the combination of tetrahedral [AlO4] 5-and [SiO4] -4 primary building units, that form channels and cavities with sizes in the range of molecular dimensions [10].…”

Section: Introductionmentioning

confidence: 99%

Effect of filler content on morphology and physical–chemical characteristics of poly(vinylidene fluoride)/NaY zeolite-filled membranes

et al. 2014

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Poly(vinylidene fluoride) electrospun membranes have been prepared with different NaY zeolite contents up to 32%wt. Inclusion of zeolites induces an increase of average fiber size from ~200 nm in the pure polymer up to ~500 nm in the composite with 16%wt zeolite content. For higher filler contents, a wider distribution of fibers occurs leading to a broader size distributions between the previous fiber size values.Hydrophobicity of the membranes increases from ~115º water contact angle to ~128º with the addition of the filler and is independent on filler content, indicating a wrapping of the zeolite by the polymer. The water contact angle further increases with fiber alignment up to ~137º. Electrospun membranes are formed with ~80 % of the polymer crystalline phase in the electroactive  phase, independently on the electrospinning processing conditions or filler content. Viability of MC3T3-E1 cells on the composite membranes after 72 h of cell culture indicates the suitability of the membranes for tissue engineering applications.

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Dielectric and magnetic properties of ferrite/poly(vinylidene fluoride) nanocomposites

Cited by 136 publications

References 31 publications

Dielectric relaxation and ferromagnetic resonance in magnetoelectric (Polyvinylidene-fluoride)/ferrite composites

Dielectric relaxation and ferromagnetic resonance in magnetoelectric (Polyvinylidene-fluoride)/ferrite composites

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

Effect of filler content on morphology and physical–chemical characteristics of poly(vinylidene fluoride)/NaY zeolite-filled membranes

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