Electrospun PVDF/BaTiO3 nanocomposites: polymorphism and thermal emissivity studies

Abstract

Non-woven fiber mats of PVDF/BaTiO 3 nanocomposites were prepared by electrospinning and characterized by various techniques. Scanning electron micrographs show that fibers obtained were randomly oriented with fiber diameters ranging between 200 nm and 400 nm. The structure of the nanocomposite fibers was studied using X-ray diffraction and ATR-FTIR techniques. The PVDF electrospun mats exhibited a mixed crystalline phase consisting of α and β phases. However the addition of BaTiO 3 was found to result in significant increase in the β phase in electrospun PVDF/BaTiO 3 mats. The enhancement in the β phase is also studied using Raman spectra and complex dielectric measurement. The thermal emissivity of the nanocomposites was found to be lower in nanocomposites as compared to pristine PVDF.

Design, fabrication and characterization of composite piezoelectric ultrafine fibers for cochlear stimulation

“…The average fiber diameter was in accordance with different previously reported studies [29,35]. The co-solvent system used (DMF and acetone) was selected according to previously reported works [29,36,37]. Basing on a study of Yee et al [37], which reported that an increase of DMF/acetone ratio induced a decrease in fiber diameter and an increase of beads present on the electrospun mesh, the 1:1 DMF/acetone ratio was selected for conducting our experiments.…”

“…The obtained fiber diameters decreased with the increase of the collector V t , although differences between datasets were not statistically significant ( also induced a reduction (not statistically significant) of the fiber diameter obtained for the composite fibers. The average fiber diameter was in accordance with different previously reported studies [29,35]. The co-solvent system used (DMF and acetone) was selected according to previously reported works [29,36,37].…”

“…PVDF powder at a concentration of 20% w/v was dissolved in a mixture of DMF and acetone (1:1 v/v) and stirred overnight [29]. For the preparation of composite electrospun fibers a selected amount of BTNPs (BaTiO 3 /PVDF weight ratios of 0%, 10%, 15% and 20% w/w) was added to the polymer solution and vigorously stirred overnight.…”

Flexible electrospun PVDF–BaTiO3 hybrid structure pressure sensor with enhanced efficiency

“…7, the peaks at 613, 762 and 975 cm À1 are for a phase of the PVDF. 37 Further, the peaks at 841 and 1280 cm À1 are attributed to b phase of PVDF. 37 The peaks at 613 and 762 cm À1 are because of CF 2 and skeletal bending of C (F)-C (H)-C (F) of a phase of the PVDF, while the peak at 975 cm À1 is due to CH 2 bending mode of a phase.…”

A Review of Piezoelectric PVDF Film by Electrospinning and Its Applications

“…Other electrospun PVDF/BT nanofiber webs were reported by Chunmal et al with DMF/acetone solvent [ 105 ]. FTIR investigations illustrated that the obtained samples of PVDF and PVDF/BT both have α- and β-phases of PVDF.…”