scholarly journals Computer Aided Molecular Modeling of the Piezoelectric Properties of Ferroelectric Composites on the Base of Polyvinylidene Fluoride with Graphene and Graphene Oxide

2017 ◽  
Vol 12 (2) ◽  
pp. 466-486
Author(s):  
А.В. Быстрова ◽  
A.V. Bystrova
Keyword(s):  
Graphene Oxide ◽  
Molecular Modeling ◽  
Polyvinylidene Fluoride ◽  
Piezoelectric Coefficient ◽  
Vinylidene Fluoride ◽  
Piezoelectric Properties ◽  
A Value ◽  
Poly Vinylidene Fluoride ◽  
Pure Pvdf ◽  
Sandwich Model

Molecular modeling of ferroelectric composites containing polyvinylidene fluoride (PVDF), graphene (G) and/or graphene oxide (GO), was performed using the semi-empirical quantum approximation PM3 in the HyperChem software package. The piezoelectric properties of the composites were analyzed and compared with the experimental data obtained for thin films containing poly(vinylidene-fluoride-trifluoroethylene) with graphene oxide (P (VDF-TrFE)/GO). A qualitative agreement was obtained between the simulation results and the experimental measurements of the piezoelectric coefficient, its decrease in the presence of G or GO was revealed. When models containing one or more layers of graphene with 54 carbon atoms were investigated, it was found that the average piezoelectric coefficient was reduced to -9.8 pm/V for the one-sided PVDF/G model and to -18.98 pm/V for the two-sided sandwich model G/PVDF/G in compare with the calculated piezoelectric coefficient for pure PVDF (-42.2 pm/V). After computer modeling for models incorporating one or more layers of 96 carbon atoms in the oxide graphene, it was found that the piezoelectric coefficient was reduced to a value of -14.6 pm/V for a one-sided PVDF / GO model and to a value of -29.8 pm/V for a two-sided sandwich model GO/ PVDF/GO compared to the piezoelectric coefficient for pure PVDF.

scholarly journals Recent Structure Development of Poly(vinylidene fluoride)-Based Piezoelectric Nanogenerator for Self-Powered Sensor

Actuators ◽  
2020 ◽  
Vol 9 (3) ◽  
pp. 57
Author(s):  
Cheoljae Lee ◽  
Hyosik Park ◽  
Ju-Hyuck Lee
Keyword(s):  
Polyvinylidene Fluoride ◽  
Piezoelectric Coefficient ◽  
Vinylidene Fluoride ◽  
Electronic Devices ◽  
Potential Candidate ◽  
Piezoelectric Polymer ◽  
Poly Vinylidene Fluoride ◽  
Harvesting Systems ◽  
Self Powered ◽  
The Internet Of Things

As the internet of things (IoT) era approaches, various sensors, and wireless electronic devices such as smartphones, smart watches, and earphones are emerging. As the types and functions of electronics are diversified, the energy consumption of electronics increases, which causes battery charging and maintenance issues. The piezoelectric nanogenerator (PENG) received great attention as an alternative to solving the energy issues of future small electronics. In particular, polyvinylidene fluoride (PVDF) piezoelectric polymer-based PENGs are strong potential candidate with robust mechanical properties and a high piezoelectric coefficient. In this review, we summarize the recent significant advances of the development of PVDF-based PENGs for self-powered energy-harvesting systems. We discuss the piezoelectric properties of the various structures of PVDF-based PENGs such as thin film, microstructure, nanostructure, and nanocomposite.

scholarly journals Preparation and Electrochemical Characterization of Organic–Inorganic Hybrid Poly(Vinylidene Fluoride)-SiO2 Cation-Exchange Membranes by the Sol-Gel Method Using 3-Mercapto-Propyl-Triethoxyl-Silane

Materials ◽  
2019 ◽  
Vol 12 (19) ◽  
pp. 3265 ◽  
Author(s):  
Li ◽  
Li ◽  
Li ◽  
Guan ◽  
Zheng ◽  
...  
Keyword(s):  
Membrane Potential ◽  
Oxidative Stability ◽  
Water Uptake ◽  
Polyvinylidene Fluoride ◽  
Vinylidene Fluoride ◽  
Sol Gel ◽  
Synthesis Method ◽  
Co2 Production ◽  
Inorganic Hybrid ◽  
Poly Vinylidene Fluoride

A new synthesis method for organic–inorganic hybrid Poly(vinylidene fluoride)-SiO2 cation-change membranes (CEMs) is proposed. This method involves mixing tetraethyl orthosilicate (TEOS) and 3-mercapto-propyl-triethoxy-silane (MPTES) into a polyvinylidene fluoride (PVDF) sol-gel solution. The resulting slurry was used to prepare films, which were immersed in 0.01 M HCl, which caused hydrolysis and polycondensation between the MPTES and TEOS. The resulting Si-O-Si polymers chains intertwined and/or penetrated the PVDF skeleton, significantly improving the mechanical strength of the resulting hybrid PVDF-SiO2 CEMs. The -SH functional groups of MPTES oxidized to-SO3H, which contributed to the excellent permeability of these CEMs. The surface morphology, hybrid structure, oxidative stability, and physicochemical properties (IEC, water uptake, membrane resistance, membrane potential, transport number, and selective permittivity) of the CEMs obtained in this work were characterized using scanning electron microscope and Fourier transform infrared spectroscopy, as well as electrochemical testing. Tests to analyze the oxidative stability, water uptake, membrane potential, and selective permeability were also performed. Our organic–inorganic hybrid PVDF-SiO2 CEMs demonstrated higher oxidative stability and lower resistance than commercial Ionsep-HC-C membranes with a hydrocarbon structure. Thus, the synthesis method described in this work is very promising for the production of very efficient CEMs. In addition, the physical and electrochemical properties of the PVDF-SiO2 CEMs are comparable to the Ionsep-HC-C membranes. The electrolysis of the concentrated CoCl2 solution performed using PVDF-SiO2-6 and Ionsep-HC-C CEMs showed that at the same current density, Co2+ production, and current efficiency of the PVDF-SiO2-6 CEM membrane were slightly higher than those obtained using the Ionsep-HC-C membrane. Therefore, our novel membrane might be suitable for the recovery of cobalt from concentrated CoCl2 solutions.

Molecular modeling of the piezoelectric effect in the ferroelectric polymer poly(vinylidene fluoride) (PVDF)

2013 ◽  
Vol 19 (9) ◽  
pp. 3591-3602 ◽  
Author(s):  
Vladimir S. Bystrov ◽  
Ekaterina V. Paramonova ◽  
Igor K. Bdikin ◽  
Anna V. Bystrova ◽  
Robert C. Pullar ◽  
...  
Keyword(s):  
Molecular Modeling ◽  
Vinylidene Fluoride ◽  
Piezoelectric Effect ◽  
Ferroelectric Polymer ◽  
Poly Vinylidene Fluoride

Development of self-poled PVDF/MWNT flexible nanocomposites with a boosted electroactive β-phase

2020 ◽  
Vol 44 (34) ◽  
pp. 14578-14591
Author(s):  
Akash M. Chandran ◽  
S. Varun ◽  
Prasanna Kumar S. Mural
Keyword(s):  
Vinylidene Fluoride ◽  
Piezoelectric Properties ◽  
Nanocomposite Films ◽  
Fabrication Method ◽  
Β Phase ◽  
Poly Vinylidene Fluoride ◽  
Dielectric And Piezoelectric Properties

In the present study, we report a simple fabrication method for poly(vinylidene fluoride) PVDF/MWCNT flexible nanocomposite films with a boosted electroactive phase that enhanced the dielectric and piezoelectric properties.

Fabrication and Characterization of Polyvinylidene Fluoride Microfilms for Microfluidic Applications

2016 ◽  
Vol 15 (05n06) ◽  
pp. 1660013
Author(s):  
Yammani Venkat Subba Rao ◽  
Aravinda Narayanan Raghavan ◽  
Meenakshi Viswanathan
Keyword(s):  
Spin Coating ◽  
Polyvinylidene Fluoride ◽  
Vinylidene Fluoride ◽  
Microstructural Properties ◽  
Average Roughness ◽  
Microfluidic Mixer ◽  
Poly Vinylidene Fluoride ◽  
Fabrication And Characterization ◽  
Microfluidic Mixers

The ability to create patterns of piezo responsive material on smooth substrate is an important method to develop efficient microfluidic mixers. This paper reports the fabrication of Poly vinylidene fluoride microfilms using spin-coating on smooth glass surface. The suitable crystalline phases, surface morphology and microstructural properties of the PVDF films have been investigated. We found that films of average thickness 10[Formula: see text][Formula: see text]m, had average roughness of 0.13[Formula: see text][Formula: see text]m. These PVDF films are useful in microfluidic mixer applications.

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