scholarly journals Crystal phase transformation of α into β phase poly(vinylidene fluoride) via particle formation caused by rapid expansion of supercritical solutions

RSC Advances ◽  
2015 ◽  
Vol 5 (82) ◽  
pp. 66644-66649 ◽  
Author(s):  
S. Wolff ◽  
F. Jirasek ◽  
S. Beuermann ◽  
M. Türk
Keyword(s):  
Phase Transformation ◽  
Vinylidene Fluoride ◽  
Piezoresponse Force Microscopy ◽  
Particle Formation ◽  
Rapid Expansion ◽  
Crystal Phase ◽  
Force Microscopy ◽  
Β Phase ◽  
Poly Vinylidene Fluoride ◽  
Crystal Phase Transformation

RESS enables the transformation from α to β phase PVDF. Piezoresponse force microscopy confirmed the piezoelectricity of the obtained particles.

Colloidal Crystallization and Ionic Liquid Induced Partial β-Phase Transformation of Poly(vinylidene fluoride) Nanoparticles

2015 ◽  
Vol 48 (8) ◽  
pp. 2570-2575 ◽  
Author(s):  
Daichi Okada ◽  
Hideki Kaneko ◽  
Katsuhiro Kato ◽  
Seiichi Furumi ◽  
Masaki Takeguchi ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Phase Transformation ◽  
Vinylidene Fluoride ◽  
Β Phase ◽  
Colloidal Crystallization ◽  
Poly Vinylidene Fluoride ◽  
Fluoride Nanoparticles

scholarly journals Interfacial piezoelectric polarization locking in printable Ti3C2Tx MXene-fluoropolymer composites

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Nick A. Shepelin ◽  
Peter C. Sherrell ◽  
Emmanuel N. Skountzos ◽  
Eirini Goudeli ◽  
Jizhen Zhang ◽  
...  
Keyword(s):  
Electrostatic Interactions ◽  
Vinylidene Fluoride ◽  
Mechanical Energy ◽  
Piezoresponse Force Microscopy ◽  
Low Energy ◽  
Force Microscopy ◽  
Energy Harvesters ◽  
Poly Vinylidene Fluoride ◽  
Dynamics Simulations ◽  
Locking Phenomena

AbstractPiezoelectric fluoropolymers convert mechanical energy to electricity and are ideal for sustainably providing power to electronic devices. To convert mechanical energy, a net polarization must be induced in the fluoropolymer, which is currently achieved via an energy-intensive electrical poling process. Eliminating this process will enable the low-energy production of efficient energy harvesters. Here, by combining molecular dynamics simulations, piezoresponse force microscopy, and electrodynamic measurements, we reveal a hitherto unseen polarization locking phenomena of poly(vinylidene fluoride–co–trifluoroethylene) (PVDF-TrFE) perpendicular to the basal plane of two-dimensional (2D) Ti3C2Tx MXene nanosheets. This polarization locking, driven by strong electrostatic interactions enabled exceptional energy harvesting performance, with a measured piezoelectric charge coefficient, d33, of −52.0 picocoulombs per newton, significantly higher than electrically poled PVDF-TrFE (approximately −38 picocoulombs per newton). This study provides a new fundamental and low-energy input mechanism of poling fluoropolymers, which enables new levels of performance in electromechanical technologies.

Local variation of the dielectric properties of poly(vinylidene fluoride) during the α- to β-phase transformation

2009 ◽  
Vol 373 (2) ◽  
pp. 177-180 ◽  
Author(s):  
P. Martins ◽  
J. Serrado Nunes ◽  
G. Hungerford ◽  
D. Miranda ◽  
A. Ferreira ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Dielectric Properties ◽  
Vinylidene Fluoride ◽  
Local Variation ◽  
Β Phase ◽  
Poly Vinylidene Fluoride

scholarly journals Effect of Annealing Temperature on the Morphology and Piezoresponse Characterisation of Poly(vinylidene fluoride-trifluoroethylene) Films via Scanning Probe Microscopy

2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
K. Lau ◽  
Y. Liu ◽  
H. Chen ◽  
R. L. Withers
Keyword(s):  
Melting Point ◽  
Annealing Temperature ◽  
Vinylidene Fluoride ◽  
Hysteresis Loops ◽  
Piezoresponse Force Microscopy ◽  
Scanning Probe ◽  
Force Microscopy ◽  
Poly Vinylidene Fluoride ◽  
Probe Microscope ◽  
Small Grains

Poly(vinylidene fluoride-trifluoroethylene) (PVDF-TrFE (70/30)) films were synthesized on a gold/glass substrate via spin coating. The films were annealed at a temperature between125∘Cand180∘C. Nanoscale characterisation of the morphology, polarization switching, and local piezoresponse hysteresis loops of PVDF-TrFE film was studied using a scanning probe microscope (SPM). Ferroelectric switchable domains were identified by piezoresponse force microscopy (PFM) for all films. Small grains, with weak piezoresponse character, were observed for films annealed just above the Curie temperature. Acicular grains were obtained when the annealing temperature approached the melting point and the piezoresponse increased. Annealing above the melting point decreased the piezoresponse and the morphology changed dramatically into plate-like structures.

High Efficient and Continuous Triboelectric Power Harvesting based on Porous β-phase Poly (vinylidene fluoride) Aerogel

2021 ◽  
Author(s):  
Minmin Wang ◽  
Weiqun Liu ◽  
Xu Shi ◽  
Jinyang Pan ◽  
Bing Zhou ◽  
...  
Keyword(s):  
Vinylidene Fluoride ◽  
High Electron ◽  
Exchange Method ◽  
Power Harvesting ◽  
Β Phase ◽  
Output Performance ◽  
High Electron Affinity ◽  
High Efficient ◽  
Poly Vinylidene Fluoride ◽  
High Output

Non-additive β-phase porous poly (vinylidene fluoride) (PVDF) aerogel with high electron affinity is successfully prepared through simple solvent exchange method. The as-prepared additive-free PVDF aerogel shows high output performance used...

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