Structure-Properties Relationship of Electrospun PVDF Fibers.
Klara Castkova,Jaroslav Kastyl,Dinara Sobola,Josef Petruš,Eva Stastna,David Riha,Pavel Tofel +6 more
TLDR
Electrospinning as a versatile technique producing nanofibers was employed to study the influence of the processing parameters and chemical and physical parameters of solutions on poly(vinylidene fluoride) (PVDF) fibers’ morphology, crystallinity, phase composition and dielectric and piezoelectric characteristics.Abstract:
Electrospinning as a versatile technique producing nanofibers was employed to study the influence of the processing parameters and chemical and physical parameters of solutions on poly(vinylidene fluoride) (PVDF) fibers’ morphology, crystallinity, phase composition and dielectric and piezoelectric characteristics PVDF fibrous layers with nano- and micro-sized fiber diameters were prepared by a controlled and reliable electrospinning process The fibers with diameters from 276 nm to 1392 nm were spun at a voltage of 25 kV–50 kV from the pure PVDF solutions or in the presence of a surfactant—Hexadecyltrimethylammonium bromide (CTAB) Although the presence of the CTAB decreased the fibers’ diameter and increased the electroactive phase content, the piezoelectric performance of the PVDF material was evidently deteriorated The maximum piezoelectric activity was achieved in the fibrous PVDF material without the use of the surfactant, when a piezoelectric charge of 33 pC N−1 was measured in the transversal direction on a mean fiber diameter of 649 nm In this direction, the material showed a higher piezoelectric activity than in the longitudinal directionread more
Citations
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Flexible and transparent composite nanofibre membrane that was fabricated via a "green" electrospinning method for efficient particulate matter 2.5 capture.
TL;DR: This study introduces a new effective air filtration membrane that can be used for outdoor protection and provides new insight into the design and development of high-performance and high-visibility green filter media, which include personal protection and building screens.
Journal ArticleDOI
Characterization of Polyvinylidene Fluoride (PVDF) Electrospun Fibers Doped by Carbon Flakes.
Pavel Kaspar,Dinara Sobola,Klara Castkova,Alexandr Knápek,Daniel Burda,F.F. Orudzhev,Rashid Dallaev,Pavel Tofel,Tomáš Trčka,Lubomír Grmela,Zdeněk Hadaš +10 more
TL;DR: A correlation between the ratios of crystalline phases and different properties, like dielectric constant as well as piezo- and triboelectric properties, has been found, but the relationship between them is highly complex.
Journal ArticleDOI
Graphene oxide functionalized polyvinylidene fluoride nanofibrous membranes for efficient particulate matter removal
TL;DR: In this paper, two-dimensional graphene oxide (GO) nanosheets are introduced into PVDF NFMs through the use of the GO/PVDF blending-electrospinning and GO@pVDF surface coating methods to prepare a highly efficient air filter, respectively.
Journal ArticleDOI
Electrospinning through the prism of time
TL;DR: In this article, the authors provide a comprehensive overview of electrospinning, as a complex technique, its evolution toward the high-throughput techniques, including the basic principles, parameters influencing the fibers production process, methods applied to solve the alignment difficulties, commonly used polymers and solvents, and the applications of the electrospun materials.
Journal ArticleDOI
Metal-Free Multilayer Hybrid PENG Based on Soft Electrospun/-Sprayed Membranes with Cardanol Additive for Harvesting Energy from Surgical Face Masks.
TL;DR: In this paper, a metal-free hybrid piezoelectric nanogenerator (hPENG) was proposed for wearable energy harvesting cloth masks, which can be reused and not disposed.
References
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Beaded nanofibers formed during electrospinning
TL;DR: The viscoelasticity of the solution, charge density carried by the jet, and the surface tension of the polymer solution are the key factors that influence the formation of the beaded fibers as discussed by the authors.
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Electroactive phases of poly(vinylidene fluoride) : determination, processing and applications
TL;DR: In this article, the main characteristics of the electroactive phases of polyvinylidene fluoride and copolymers are summarized, and some interesting potential applications and processing challenges are discussed.
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Ftir studies of -phase crystal formation in stretched pvdf films
A Salimi,A A Yousefi +1 more
TL;DR: In this article, the appearance of β-phase in compression molded films of two different grades of poly vinylidene fluoride (PVDF) resin was analyzed using FTIR spectra.
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A critical analysis of the α, β and γ phases in poly(vinylidene fluoride) using FTIR
TL;DR: In this article, a universal phase identification procedure using only the Fourier transform infrared spectroscopy (FTIR) results is proposed and validated, which can differentiate the three phases by checking the bands around 763 and/or 614, 1275, and 1234 cm−1 for the α, β and γ phases, respectively.
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Electric‐field‐induced phase changes in poly(vinylidene fluoride)
TL;DR: The antipolar crystal form of poly(vinylidene fluoride) can be made piezoelectric and pyroelecric by the temporary application of electric fields in excess of 1 MV/cm at room temperature as discussed by the authors.