Effect of annealing treatment on PVDF nanofibers for mechanical energy harvesting applications

Satthiyaraju, M.; Ramesh, T.

doi:10.1088/2053-1591/ab4037

Cited by 57 publications

(33 citation statements)

References 66 publications

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“…PMMA-modified graphene sheets are utilized as a nucleating agent for β phase in PVDF or modified graphene nanocomposite by Nayek et al PMMA contains carbonyl group is used with graphene. Moreover Fewlayered-graphene also being used in many other applications as well like wapour phase separtion, sensors, energy storage devices, and piezoelectric devices [18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Strengthening of β polymorph in PVDF/FLG and PVDF/GO nanocomposites

Islam

Khan

Shakir

et al. 2019

Mater. Res. Express

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The nanocomposites of PVDF/FLG and PVDF/GO are prepared using the solution casting method for varying concentrations of FLG and GO from 0.1 to 1 wt% in PVDF matrix. The effect and dispersion of FLG and GO are observed with help of Scanning electron microscopy (SEM) and x-ray diffraction confirming the good dispersion of FLG and GO in the matrix. The samples are also characterized for thermal and mechanical properties using Differential scanning calorimetry (DSC) and universal testing machine (UTM). FLG and GO nanofillers seemed to increase the tensile strength from 10 MPa to 20 MPa and variation in crystallinity to get maximum output in terms of β phase which can be utilized for piezoelectric and pyroelectric behavior of PVDF polymer.

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Section: Introductionmentioning

confidence: 99%

Strengthening of β polymorph in PVDF/FLG and PVDF/GO nanocomposites

Islam

Khan

Shakir

et al. 2019

Mater. Res. Express

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“…As reported in previous studies, the annealing treatment can induce a phase transformation from the nonpolar α phase to the polar β phase owing to the reorientation of the PVDF molecular structure. This leads to a re-ordering of dipole moments, thereby sharpening the crystalline peak of the β phase and subsequent intense ferroelectricity at higher annealing temperatures [39] , [62] . Prolonged heating treatment at high temperature might result in the filtration performance degradation due to the slight deterioration of PVDF crystalline phases consisting of β phase [63] , which is clearly depicted by XRD patterns in Fig.…”

Section: Resultsmentioning

confidence: 99%

Ferroelectric PVDF nanofiber membrane for high-efficiency PM0.3 air filtration with low air flow resistance

Bui

Shin

Jee³

et al. 2022

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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The significant public health concerns related to particulate matter (PM) air pollutants and the airborne transmission of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) have led to considerable interest in high-performance air filtration membranes. Highly ferroelectric polyvinylidene fluoride (PVDF) nanofiber (NF) filter membranes are successfully fabricated via electrospinning for high-performance low-cost air filtration. Spectroscopic and ferro-/piezoelectric analyses of PVDF NF show that a thinner PVDF NF typically forms a ferroelectric β phase with a confinement effect. A 70-nm PVDF NF membrane exhibits the highest fraction of β phase (87%) and the largest polarization behavior from piezoresponse force microscopy. An ultrathin 70-nm PVDF NF membrane exhibits a high PM 0.3 filtration efficiency of 97.40% with a low pressure drop of 51 Pa at an air flow of 5.3 cm/s owing to the synergetic combination of the slip effect and ferroelectric dipole interaction. Additionally, the 70-nm PVDF NF membrane shows excellent thermal and chemical stabilities with negligible filtration performance degradation (air filtration efficiency of 95.99% and 87.90% and pressure drop of 55 and 65 Pa, respectively) after 24 h of heating at 120 °C and 1 h immersion in isopropanol.

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“…In our case, however, a heat treatment method is preferred. It has been shown and repeatedly confirmed that one of the optimized ways to achieve the ferroelectric β phase crystalline ordering in PVDF-HFP thin films is thermal annealing [58][59][60][61]. A series of 150 layer thick PVDF-HFP samples were annealed at different temperatures (from 120-150 •C) for 180 minutes in an argon atmosphere changing the morphology of the PVDF-HFP thin films, as seen in the IR spectra of figure 3 (b).…”

Section: Molecular Ferroelectric Film Thickness Dependencementioning

confidence: 88%

Spectroscopy Study of Isothermal Spin State Switching in a Fe (II) Spin Crossover Molecular Thin Film

Yazdani¹,

Collier²,

Yang³

et al. 2022

Preprint

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Using optical characterization, it is evident that the spin state of the spin crossover molecular complex [Fe{H2B(pz)2}2(bipy)] (pz = tris (pyrazol-1-1y)-borohydride, bipy = 2,2’-bipyridine) depends on the ferroelectric polarization of an adjacent thin film of the polymer ferroelectric polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP). The UV-Vis spectroscopy reveals that room temperature switching of [Fe{H2B(pz)2}2(bipy)] molecules in bilayers of PVDF-HFP/[Fe{H2B(pz)2}2(bipy)] as a function of ferroelectric polar polarization. The electric polarity dependence of bilayers of PVDF-HFP/[Fe{H2B(pz)2}2(bipy)] shows a strong dependence on the thickness of the PVDF-HFP layer. The PVDF-HFP/[Fe{H2B(pz)2}2(bipy)] interface may affect polarization retention in the PVDF-HFP thin film limit.

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Effect of annealing treatment on PVDF nanofibers for mechanical energy harvesting applications

Cited by 57 publications

References 66 publications

Strengthening of β polymorph in PVDF/FLG and PVDF/GO nanocomposites

Strengthening of β polymorph in PVDF/FLG and PVDF/GO nanocomposites

Ferroelectric PVDF nanofiber membrane for high-efficiency PM0.3 air filtration with low air flow resistance

Spectroscopy Study of Isothermal Spin State Switching in a Fe (II) Spin Crossover Molecular Thin Film

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