scholarly journals Acoustic–electric conversion and piezoelectric properties of electrospun polyvinylidene fluoride/silver nanofibrous membranes

2020 ◽  
Vol 14 (2) ◽  
pp. 103-114 ◽  
Author(s):  
C. M. Wu ◽  
M. H. Chou
Keyword(s):  
Polyvinylidene Fluoride ◽  
Piezoelectric Properties ◽  
Nanofibrous Membranes

scholarly journals Electrospun Nanostructured Membrane Engineering Using Reverse Osmosis Recycled Modules: Membrane Distillation Application

Nanomaterials ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 1601
Author(s):  
Jorge Contreras-Martínez ◽  
Carmen García-Payo ◽  
Mohamed Khayet
Keyword(s):  
Reverse Osmosis ◽  
Polyvinylidene Fluoride ◽  
Membrane Distillation ◽  
Permeate Flux ◽  
Electrospinning Technique ◽  
Salt Rejection ◽  
Rejection Factor ◽  
Nanofibrous Membranes ◽  
Membrane Engineering ◽  
Desalination Plants

As a consequence of the increase in reverse osmosis (RO) desalination plants, the number of discarded RO modules for 2020 was estimated to be 14.8 million annually. Currently, these discarded modules are disposed of in nearby landfills generating high volumes of waste. In order to extend their useful life, in this research study, we propose recycling and reusing the internal components of the discarded RO modules, membranes and spacers, in membrane engineering for membrane distillation (MD) technology. After passive cleaning with a sodium hypochlorite aqueous solution, these recycled components were reused as support for polyvinylidene fluoride nanofibrous membranes prepared by electrospinning technique. The prepared membranes were characterized by different techniques and, finally, tested in desalination of high saline solutions (brines) by direct contact membrane distillation (DCMD). The effect of the electrospinning time, which is the same as the thickness of the nanofibrous layer, was studied in order to optimize the permeate flux together with the salt rejection factor and to obtain robust membranes with stable DCMD desalination performance. When the recycled RO membrane or the permeate spacer were used as supports with 60 min electrospinning time, good permeate fluxes were achieved, 43.2 and 18.1 kg m−2 h−1, respectively; with very high salt rejection factors, greater than 99.99%. These results are reasonably competitive compared to other supported and unsupported MD nanofibrous membranes. In contrast, when using the feed spacer as support, inhomogeneous structures were observed on the electrospun nanofibrous layer due to the special characteristics of this spacer resulting in low salt rejection factors and mechanical properties of the electrospun nanofibrous membrane.

Enhanced piezoelectric properties of polyvinylidene fluoride nanofibers using carbon nanofiber and electrical poling

2019 ◽  
Vol 255 ◽  
pp. 126515 ◽  
Author(s):  
R. Senthil Kumar ◽  
T. Sarathi ◽  
K.K. Venkataraman ◽  
Amitava Bhattacharyya
Keyword(s):  
Polyvinylidene Fluoride ◽  
Piezoelectric Properties ◽  
Carbon Nanofiber

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.

Polyvinylidene Fluoride/Siloxane Nanofibrous Membranes for Long-Term Continuous CO2-Capture with Large Absorption-Flux Enhancement

ChemSusChem ◽  
2013 ◽  
Vol 7 (2) ◽  
pp. 604-609 ◽  
Author(s):  
Yi-Feng Lin ◽  
Chi-Sen Wang ◽  
Chia-Chieh Ko ◽  
Chien-Hua Chen ◽  
Kai-Shiun Chang ◽  
...  
Keyword(s):  
Co2 Capture ◽  
Polyvinylidene Fluoride ◽  
Flux Enhancement ◽  
Nanofibrous Membranes
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