On the synthesis and characterization of (bio)ferroelectrically active PVDF-BCP composites

Silva, L. M.; Bonadio, T. G. M.; Rosso, J. M.; Dias, G. S.; Cótica, L. F.; Weinand, W. R.; Miyahara, Ricardo Yoshimitsu; Santos, I. A.; Freitas, V. F.

doi:10.1080/00150193.2018.1470840

Cited by 6 publications

(4 citation statements)

References 40 publications

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“…Figure 5 shows the ATR-FTIR spectra for PVDF and HA powders and for the electrospun P14-H10, P14-H15, P14-H20 samples. In PVDF powder spectrum ( Figure 5 a), there was a greater presence of bands related to the

phase (763, 796, 855, 873, 975, 1150, 1182, 1208 and 1384 cm

) than those related to the

phase (840, 1068, 1275 and 1424 cm

) or to the

one (950 and 1234 cm

) [ 47 , 48 , 49 , 50 ]. In the HA powder sample spectrum bands at 962, 1024 and 1088 cm

, characteristics of vibrational modes of the PO

functional group of hydroxyapatite are observed [ 49 , 51 ].…”

Section: Resultsmentioning

confidence: 99%

“…As for the bands related to hydroxyapatite, it is interesting to note that all the three spectra, in addition to presenting peaks at 962 and 1088 cm

, also showed the emergence of a new peak at 1046 cm

, related to the mode of vibration of the PO

functional group. From HA [ 49 ], the band at 1024 cm

appeared only as a shoulder. This may have occurred due to the overlapping of bands that occurred in this region of the spectrum.…”

Section: Resultsmentioning

confidence: 99%

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4th Generation Biomaterials Based on PVDF-Hydroxyapatite Composites Produced by Electrospinning: Processing and Characterization

et al. 2022

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Biomaterials that effectively act in biological systems, as in treatment and healing of damaged or lost tissues, must be able to mimic the properties of the body’s natural tissues in its various aspects (chemical, physical, mechanical and surface). These characteristics influence cell adhesion and proliferation and are crucial for the success of the treatment for which a biomaterial will be required. In this context, the electrospinning process has gained prominence in obtaining fibers of micro- and nanometric sizes from polymeric solutions aiming to produce scaffolds for tissue engineering. In this manuscript, poly(vinylidene fluoride) (PVDF) was used as a polymeric matrix for the manufacture of piezoelectric scaffolds, exploring the formation of the β-PVDF piezoelectric phase. Micro- and nanometric hydroxyapatite (HA) particles were incorporated as a dispersed phase in this matrix, aiming to produce multifunctional composite membranes also with bioactive properties. The results show that it is possible to produce membranes containing micro- and nanofibers of the composite by the electrospinning process. The HA particles show good dispersion in the polymer matrix and predominance of β-PVDF phase. Also, the composite showed apatite growth on its surface after 21 days of immersion in simulated body fluid (SBF). Tests performed on human fibroblasts culture revealed that the electrospun membranes have low cytotoxicity attesting that the composite shows great potential to be used in biomedical applications as bone substitutions and wound healing.

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phase (763, 796, 855, 873, 975, 1150, 1182, 1208 and 1384 cm

) than those related to the

phase (840, 1068, 1275 and 1424 cm

) or to the

one (950 and 1234 cm

) [ 47 , 48 , 49 , 50 ]. In the HA powder sample spectrum bands at 962, 1024 and 1088 cm

, characteristics of vibrational modes of the PO

functional group of hydroxyapatite are observed [ 49 , 51 ].…”

Section: Resultsmentioning

confidence: 99%

“…As for the bands related to hydroxyapatite, it is interesting to note that all the three spectra, in addition to presenting peaks at 962 and 1088 cm

, also showed the emergence of a new peak at 1046 cm

, related to the mode of vibration of the PO

functional group. From HA [ 49 ], the band at 1024 cm

appeared only as a shoulder. This may have occurred due to the overlapping of bands that occurred in this region of the spectrum.…”

Section: Resultsmentioning

confidence: 99%

4th Generation Biomaterials Based on PVDF-Hydroxyapatite Composites Produced by Electrospinning: Processing and Characterization

et al. 2022

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“…The next step in the research was an analysis of FTIR spectra of the samples, given in Figure 5 . According to these spectra, there was a greater presence of bands related to the α–and β–phase of PVDF, especially at 537, 724, 734, and 895 cm −1 [ 43 , 44 ]. The FTIR spectrum of samples 1, 2, and 5 are in strong agreement with each other.…”

Section: Resultsmentioning

confidence: 99%

Biocompatible Piezoelectric PVDF/HA/AgNO3 Thin Film Prepared by the Solvent Casting Method

Markuniene

Rabiei

Nasiri

et al. 2022

Sensors

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In this study, new composites based on polyvinylidene fluoride (PVDF) were ornamented and prepared with hydroxyapatite (HA) and silver nitride (AgNO3). Taking into account the polarity of the solvent dimethyl sulfoxide, this solvent was used to disperse the particles. The aim of using DMSO was to create amorphous phases and the strong dipoles of the C–F bond to reduce the energy barrier and improve the electrical properties. The PVDF played the role of matrix in HA, and AgNO3 was used as reinforcing elements. X-ray diffraction of the samples directly showed the amorphous phase and mixed amorphous and crystalline phases when all three materials were used simultaneously for preparing the composite. The scanning electron microscopy (SEM) images of the samples confirmed the role of PVDF, HA, and AgNO3. Furthermore, the energy dispersive X-ray (EDX) analysis was performed and proved that the HA structure did not change when the ratio of Cap was equal to the ratio of natural HA. The electrical properties were investigated, and the amount of energy ranged from 56.50 to 125.20 mV. The final results showed that a designed device consisting of an active layer made of 0.1 g HA:0.5 g PVDF showed the highest energy barrier, the highest polarity, and surface energy, thus proving its relevance as potential material for energy harvesting applications.

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“…Electroactive polymers have attracted a lot of attention due to their potential applications in exible electronic devices. Among them, poly(vinylidene uoride) (PVDF) has received more attention due to its excellent piezoelectric [1,2,3], ferroelectric [4,5], and dielectric [6,7] properties. The dielectric properties of PVDF play an important role in the eld of electromagnetic interference shielding [8], high energy density capacitor [9], exible nanogenerator [10], and so on.…”

Section: Introductionmentioning

confidence: 99%

Structural revolution of PVDF crystallized on nanocarbon surface on a gradient temperature stage and its dielectric properties

Wang

Liang

et al. 2023

Preprint

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Poly (vinylidene fluoride) (PVDF) has been widely concerned because of its various transformations of crystal phase as well as its special dielectric, piezoelectric, and other electrical properties. In this paper, the temperature gradient (T-gradient) was constructed for studying the temperature dependence of crystallization behavior of PVDF and the heterogenous nucleation effect of multiwall carbon nanotubes (MWCNT) and graphene nano-platelets (GN). The aggregate structure, the change content of PVDF conformation, and the influence of heterogenous nucleating agent on the crystallization behavior of PVDF formed at different crystallization temperature (Tc) were investigated through three different dimensions by using FTIR for surface, WAXD/SAXS for bulk and AFM for cross-section respectively. The results showed that the low temperature and heterogenous nucleating agent were both conductive to the formation of γ phase of PVDF. The content of γ phase reached to 77% when Tc was lower than 61 ℃, and the proportion of γ (021) peak increases from 1.7–7.0% when PVDF crystallized at Tc =117 ℃ induced by MWCNT-rich. And the high density of nucleus and low Tc lead to the lower lamellar thickness and lower crystallite size. Higher content and lower crystallite size of γ phase leads to higher dielectric constant. The dielectric constant of sample crystallized at 61 ℃ which was induced by GN was significantly increased up to 6.2 which can lay a foundation for its future application in the field of dielectric.

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On the synthesis and characterization of (bio)ferroelectrically active PVDF-BCP composites

Cited by 6 publications

References 40 publications

4th Generation Biomaterials Based on PVDF-Hydroxyapatite Composites Produced by Electrospinning: Processing and Characterization

4th Generation Biomaterials Based on PVDF-Hydroxyapatite Composites Produced by Electrospinning: Processing and Characterization

Biocompatible Piezoelectric PVDF/HA/AgNO3 Thin Film Prepared by the Solvent Casting Method

Structural revolution of PVDF crystallized on nanocarbon surface on a gradient temperature stage and its dielectric properties

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