Electrohydrodynamically Processed Poly-(Vinylidene Fluoride)/Polyaniline Composite Film on Soft Tissue Paper for Mechanoelectrical Energy Conversion and Vibration Sensing

2018 ◽  
Author(s):  
Muhammad S. Waliullah ◽  
Yong X. Gan ◽  
Ann D. Chen ◽  
Ryan N. Gan
Keyword(s):  
Soft Tissue ◽  
Composite Film ◽  
Energy Conversion ◽  
Structural Integrity ◽  
Vinylidene Fluoride ◽  
Electron Microscopic ◽  
Peak Voltage ◽  
Tissue Paper ◽  
Vibration Sensing ◽  
Poly Vinylidene Fluoride

Electrohydrodynamic processing including electrospinning and electrospraying is suitable for depositing controllable structures in fiber or film form. In this work, the electrohydrodynamic approach was used to prepare poly(vinylidene fluoride)/polyaniline composite film. Scanning electron microscopic analysis was performed to show the morphology of the film on soft tissue paper. Self-poling of the film was found due to the high voltage application in the electrohydrodynamic process. The addition of polyaniline into PVDF improves the conductivity of the film significantly. Mechanoelectrical response of the film was demonstrated by measuring the open circuit voltage of the specimens under bending. The peak voltage generated is over 1.2 V due to the bending deformation of the film. The film has ultrafast response to the deformation. It is concluded that the film has multiple functions for mechanoelectrical energy conversion, vibration sensing, and structural integrity monitoring applications.

scholarly journals Comparative Study of PVDF Sheets and Their Sensitivity to Mechanical Vibrations: The Role of Dimensions, Molecular Weight, Stretching and Poling

Nanomaterials ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1637
Author(s):  
Miroslav Mrlík ◽  
Josef Osička ◽  
Martin Cvek ◽  
Markéta Ilčíková ◽  
Peter Srnec ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Comparative Study ◽  
Vinylidene Fluoride ◽  
Initial Thickness ◽  
Complementary Method ◽  
Β Phase ◽  
Vibration Sensing ◽  
Poly Vinylidene Fluoride ◽  
Processing Techniques ◽  
The Comparative Study

This paper is focused on the comparative study of the vibration sensing capabilities of poly(vinylidene fluoride) (PVDF) sheets. The main parameters such as molecular weight, initial sample thickness, stretching and poling were systematically applied, and their impact on sensing behavior was examined. The mechanical properties of prepared sheets were investigated via tensile testing on the samples with various initial thicknesses. The transformation of the α-phase to the electro-active β-phase was analyzed using FTIR after applying stretching and poling procedures as crucial post-processing techniques. As a complementary method, the XRD was applied, and it confirmed the crystallinity data resulting from the FTIR analysis. The highest degree of phase transformation was found in the PVDF sheet with a moderate molecular weight (Mw of 275 kDa) after being subjected to the highest axial elongation (500%); in this case, the β-phase content reached approximately 90%. Finally, the vibration sensing capability was systematically determined, and all the mentioned processing/molecular parameters were taken into consideration. The whole range of the elongations (from 50 to 500%) applied on the PVDF sheets with an Mw of 180 and 275 kDa and an initial thickness of 0.5 mm appeared to be sufficient for vibration sensing purposes, showing a d33 piezoelectric charge coefficient from 7 pC N−1 to 9.9 pC N−1. In terms of the d33, the PVDF sheets were suitable regardless of their Mw only after applying the elongation of 500%. Among all the investigated samples, those with an initial thickness of 1.0 mm did not seem to be suitable for vibration sensing purposes.

scholarly journals Polarization Properties and Polarization Depth Profiles of (Cd:Zn)S/P(VDF-TrFE) Composite Films in Dependence of Optical Excitation

Polymers ◽  
2018 ◽  
Vol 10 (11) ◽  
pp. 1205
Author(s):  
Sebastian Engel ◽  
David Smykalla ◽  
Bernd Ploss ◽  
Stephan Gräf ◽  
Frank Müller
Keyword(s):  
Depth Profile ◽  
Vinylidene Fluoride ◽  
Composite Films ◽  
Optical Excitation ◽  
Pyroelectric Coefficient ◽  
Excitation Intensity ◽  
Peak Voltage ◽  
Small Peak ◽  
Temporal Decay ◽  
Poly Vinylidene Fluoride

The influence of optical excitation intensity on the electrical, ferroelectric and pyroelectric properties of ferroelectric-semiconductor-composites was investigated. For this purpose, composite thin films consisting of poly(vinylidene fluoride-co-trifluoroethylene) and 10 vol % (Cd:Zn)S particles with a thickness of 34 µm were fabricated. The samples were used to measure the absolute pyrocoefficient and to determine the relative pyroelectric depth profile using Laser Intensity Modulated Method. It was shown that a polarization of the samples without an optical excitation at the utilized relatively small peak-to-peak voltages could not be verified by the Sawyer–Tower circuit and the measurement setup of the pyroelectric coefficient, respectively. Both remanent polarization and pyroelectric coefficients increased with increasing optical excitation intensity during poling as well as increasing peak-to-peak voltage. The pyrocoefficient shows a temporal decay in the first hours after poling. The specific heat and thermal conductivity or the thermal diffusivity are required for the calibration of the pyroelectric depth profile. Rule of mixture and photo-acoustic investigations proved that the thermal properties of the utilized composites do not differ significantly from those of the pristine polymer. Based on the pyroelectric depth profile which is proportional to the polarization profile, the existing “three phase model” has been extended to generate a replacement circuit diagram, explaining the local polarization due to the optical excitation dependency for both local resistivity and local field strength.

Mechanical, thermal, conductivity, and electrochemical behavior of poly(vinylidene fluoride)/poly(3,4-ethylenedioxythiophene)/polyaniline-grafted-nanodiamond nanocomposite

2018 ◽  
Vol 33 (5) ◽  
pp. 628-645
Author(s):  
Ayesha Kausar
Keyword(s):  
Electrical Conductivity ◽  
Tensile Strength ◽  
Vinylidene Fluoride ◽  
Electrochemical Impedance ◽  
Coulombic Efficiency ◽  
Specific Capacity ◽  
Physical Interaction ◽  
Electron Microscopic ◽  
Nd Addition ◽  
Poly Vinylidene Fluoride

This study reports on novel poly(vinylidene fluoride)/poly(3,4-ethylenedioxythiophene) (PVDF/PEDT) blend and nanocomposite. Polyaniline functional nanodiamond (PANI-ND) was prepared through in situ route and reinforced in blend to form PVDF/PEDT/PANI-ND. Field-emission scanning electron microscopic analysis revealed consistently dispersed and interlinked bead-like morphology owing to physical interaction in matrix–nanodiamond. Transmission electron microscopy also revealed spherical nanoparticles dispersed in the matrix. Tensile strength and modulus for neat PVDF/PEDT blend were found to be 44.2 MPa and 20.2 GPa, respectively. PVDF/PEDT/PANI-ND 5 with 5 wt% PANI-ND showed high tensile strength and modulus of 61.5 MPa and 152.7 GPa. In this way, strength and modulus of PVDF/PEDT/PANI-ND 5 was 22% and 87% (respectively) higher than the pristine blend. Nanofiller reinforcement (5 wt%) also enhanced the 10% degradation temperature from 421°C (neat blend) to 555°C and maximum decomposition temperature from 466°C to 588°C. Moreover, PANI-ND addition from 0.1–5 wt% enhanced the electrical properties from 10−3–2.1 S cm−1(at room temperature). At 100°C, electrical conductivity of all nanocomposite was increased and maximum value was attained for PVDF/PEDT/PANI-ND 5 (3.0 S cm−1). PVDF/PEDT/PANI-ND 5 electrode exposed rapid Li+-ion diffusion, electron transfer, and electrical conductivity profile. Electrochemical impedance spectroscopy exhibited specific capacity and Coulombic efficiency of 900 mA h g−1and 90% after 300 cycles.

Enhanced ferroelectricity and energy storage in poly(vinylidene fluoride)–clay nanocomposite films via nanofiller surface charge modulation

RSC Advances ◽  
2015 ◽  
Vol 5 (104) ◽  
pp. 85884-85888 ◽  
Author(s):  
Y. Wang ◽  
J. Li ◽  
Y. Deng
Keyword(s):  
Energy Storage ◽  
Composite Film ◽  
Vinylidene Fluoride ◽  
Electronic Devices ◽  
Nanocomposite Films ◽  
Simultaneous Increase ◽  
Organic Electronic Devices ◽  
Organic Electronic ◽  
Poly Vinylidene Fluoride ◽  
Charge Modulation

Simultaneous increase in ferroelectricity and energy storage was achieved in pvdf/mmt composite film indicating a good candidate for all-organic electronic devices.

Triboelectric generator composed of bulk poly(vinylidene fluoride) and polyethylene polymers for mechanical energy conversion

RSC Advances ◽  
2016 ◽  
Vol 6 (2) ◽  
pp. 910-917 ◽  
Author(s):  
Piyush Kanti Sarkar ◽  
Subrata Maji ◽  
Gundam Sandeep Kumar ◽  
Krushna Chandra Sahoo ◽  
Dipankar Mandal ◽  
...  
Keyword(s):  
Energy Conversion ◽  
Output Voltage ◽  
Vinylidene Fluoride ◽  
Mechanical Energy ◽  
Poly Vinylidene Fluoride ◽  
Triboelectric Generator

Triboelectric generator composed of poly(vinylidene fluoride) and polyethylene shows an output voltage of ∼20 V lighting at least 12 LEDs.

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