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Materials 2016, 9(8), 671; doi:10.3390/ma9080671

Fabrication, Polarization of Electrospun Polyvinylidene Fluoride Electret Fibers and Effect on Capturing Nanoscale Solid Aerosols

1
Department of Chemical and Biomolecular Engineering, The University of Akron, Akron, OH 44325, USA
2
Larsen & Toubro India, Hyderabad 500018, India
3
Department of Chemical Engineering, Jazan University, Jazan 45142, Saudi Arabia
4
Hyundai Motor Company, Seoul 18280, Korea
5
Department of Polymer Science, The University of Akron, Akron, OH 44325, USA
Electronic supplementary data available.
*
Author to whom correspondence should be addressed.
Academic Editor: Nicole Zander
Received: 1 June 2016 / Revised: 26 July 2016 / Accepted: 2 August 2016 / Published: 9 August 2016
(This article belongs to the Section Porous Materials)
View Full-Text   |   Download PDF [8857 KB, uploaded 9 August 2016]   |  

Abstract

Electrospun polyvinylidene fluoride (PVDF) fiber mats with average fiber diameters (≈200 nm, ≈2000 nm) were fabricated by controlled electrospinning conditions. These fiber mats were polarized using a custom-made device to enhance the formation of the electret β-phase ferroelectric property of the fibers by simultaneous uniaxial stretching of the fiber mat and heating the mat to the Curie temperature of the PVDF polymer in a strong electric field of 2.5 kV/cm. Scanning electron microscopy, Fourier transform infrared spectroscopy, thermal gravimetric analysis, differential scanning calorimetry and Brunauer-Emmett-Teller (BET) surface area analyses were performed to characterize both the internal and external morphologies of the fiber mat samples to study polarization-associated changes. MATLAB simulations revealed the changes in the paths of the electric fields and the magnetic flux inside the polarization field with inclusion of the ferroelectric fiber mats. Both polarized and unpolarized fiber mats were challenged as filters against NaCl particles with average particle diameters of about 150 nm using a TSI 8130 to study capture efficiencies and relative pressure drops. Twelve filter experiments were conducted on each sample at one month time intervals between experiments to evaluate the reduction of the polarization enhancement over time. The results showed negligible polarization loss for the 200-nm fiber sample. The polarized mats had the highest filter efficiencies and lowest pressure drops. View Full-Text
Keywords: electret; electrospinning; polarization; polyvinylidene fluoride; filtration electret; electrospinning; polarization; polyvinylidene fluoride; filtration
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Lolla, D.; Lolla, M.; Abutaleb, A.; Shin, H.U.; Reneker, D.H.; Chase, G.G. Fabrication, Polarization of Electrospun Polyvinylidene Fluoride Electret Fibers and Effect on Capturing Nanoscale Solid Aerosols. Materials 2016, 9, 671.

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