Biocompatible Silk/Polymer Energy Harvesters Using Stretched Poly (vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) Nanofibers
Energy harvested from human body movement can produce continuous, stable energy to portable electronics and implanted medical devices. The energy harvesters need to be light, small, inexpensive, and highly portable. Here we report a novel biocompatible device made of poly (vinylidene fluoride-co-hex...
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doaj-dfcba4b17472466688b356ba749e3ee12020-11-25T00:22:26ZengMDPI AGPolymers2073-43602017-09-0191047910.3390/polym9100479polym9100479Biocompatible Silk/Polymer Energy Harvesters Using Stretched Poly (vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) NanofibersRaghid Najjar0Yi Luo1Dave Jao2David Brennan3Ye Xue4Vince Beachley5Xiao Hu6Wei Xue7Mechanical Engineering, Rowan University, Glassboro, NJ 08028, USACommunication Engineering, Hangzhou Dianzi University, Hangzhou 310018, ChinaBiomedical Engineering, Rowan University, Glassboro, NJ 08028, USABiomedical Engineering, Rowan University, Glassboro, NJ 08028, USABiomedical Engineering, Rowan University, Glassboro, NJ 08028, USABiomedical Engineering, Rowan University, Glassboro, NJ 08028, USABiomedical Engineering, Rowan University, Glassboro, NJ 08028, USAMechanical Engineering, Rowan University, Glassboro, NJ 08028, USAEnergy harvested from human body movement can produce continuous, stable energy to portable electronics and implanted medical devices. The energy harvesters need to be light, small, inexpensive, and highly portable. Here we report a novel biocompatible device made of poly (vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) nanofibers on flexible substrates. The nanofibers are prepared with electrospinning followed by a stretching process. This results in aligned nanofibers with diameter control. The assembled device demonstrates high mechanical-to-electrical conversion performance, with stretched PVDF-HFP nanofibers outperforming regular electrospun samples by more than 10 times. Fourier transform infrared spectroscopy (FTIR) reveals that the stretched nanofibers have a higher β phase content, which is the critical polymorph that enables piezoelectricity in polyvinylidene fluoride (PVDF). Polydimethylsiloxane (PDMS) is initially selected as the substrate material for its low cost, high flexibility, and rapid prototyping capability. Bombyx Mori silkworm silk fibroin (SF) and its composites are investigated as promising alternatives due to their high strength, toughness, and biocompatibility. A composite of silk with 20% glycerol demonstrates higher strength and larger ultimate strain than PDMS. With the integration of stretched electrospun PVDF-HFP nanofibers and flexible substrates, this pilot study shows a new pathway for the fabrication of biocompatible, skin-mountable energy devices.https://www.mdpi.com/2073-4360/9/10/479energy harvesterpolyvinylidene fluoride (PVDF)silkpiezoelectricityelectrospinningstretching |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Raghid Najjar Yi Luo Dave Jao David Brennan Ye Xue Vince Beachley Xiao Hu Wei Xue |
spellingShingle |
Raghid Najjar Yi Luo Dave Jao David Brennan Ye Xue Vince Beachley Xiao Hu Wei Xue Biocompatible Silk/Polymer Energy Harvesters Using Stretched Poly (vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) Nanofibers Polymers energy harvester polyvinylidene fluoride (PVDF) silk piezoelectricity electrospinning stretching |
author_facet |
Raghid Najjar Yi Luo Dave Jao David Brennan Ye Xue Vince Beachley Xiao Hu Wei Xue |
author_sort |
Raghid Najjar |
title |
Biocompatible Silk/Polymer Energy Harvesters Using Stretched Poly (vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) Nanofibers |
title_short |
Biocompatible Silk/Polymer Energy Harvesters Using Stretched Poly (vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) Nanofibers |
title_full |
Biocompatible Silk/Polymer Energy Harvesters Using Stretched Poly (vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) Nanofibers |
title_fullStr |
Biocompatible Silk/Polymer Energy Harvesters Using Stretched Poly (vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) Nanofibers |
title_full_unstemmed |
Biocompatible Silk/Polymer Energy Harvesters Using Stretched Poly (vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) Nanofibers |
title_sort |
biocompatible silk/polymer energy harvesters using stretched poly (vinylidene fluoride-co-hexafluoropropylene) (pvdf-hfp) nanofibers |
publisher |
MDPI AG |
series |
Polymers |
issn |
2073-4360 |
publishDate |
2017-09-01 |
description |
Energy harvested from human body movement can produce continuous, stable energy to portable electronics and implanted medical devices. The energy harvesters need to be light, small, inexpensive, and highly portable. Here we report a novel biocompatible device made of poly (vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) nanofibers on flexible substrates. The nanofibers are prepared with electrospinning followed by a stretching process. This results in aligned nanofibers with diameter control. The assembled device demonstrates high mechanical-to-electrical conversion performance, with stretched PVDF-HFP nanofibers outperforming regular electrospun samples by more than 10 times. Fourier transform infrared spectroscopy (FTIR) reveals that the stretched nanofibers have a higher β phase content, which is the critical polymorph that enables piezoelectricity in polyvinylidene fluoride (PVDF). Polydimethylsiloxane (PDMS) is initially selected as the substrate material for its low cost, high flexibility, and rapid prototyping capability. Bombyx Mori silkworm silk fibroin (SF) and its composites are investigated as promising alternatives due to their high strength, toughness, and biocompatibility. A composite of silk with 20% glycerol demonstrates higher strength and larger ultimate strain than PDMS. With the integration of stretched electrospun PVDF-HFP nanofibers and flexible substrates, this pilot study shows a new pathway for the fabrication of biocompatible, skin-mountable energy devices. |
topic |
energy harvester polyvinylidene fluoride (PVDF) silk piezoelectricity electrospinning stretching |
url |
https://www.mdpi.com/2073-4360/9/10/479 |
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