Electron beam-induced piezoelectric phase in poly(vinylidene fluoride) nanohybrid: effect at the molecular level

Tiwari, Vimal K.; Rath, M.C.; Sarkar, S.K.; Patel, Vijay Kumar; Ray, Biswajit; Maiti, Biswajit; Maiti, Pralay

doi:10.1002/pi.4777

Cited by 9 publications

(9 citation statements)

References 41 publications

(66 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Figure B shows UV‐Vis absorption spectra of unirradiated, functionalized and sulfonated PVDF and its nanohybrid. Pure PVDF does not show any absorption band while a weak absorption peak at 242 nm for nanohybrid (NH) is due to π→π * transition of olefinic bond present in organically modified nanoclay ,,. Interestingly, this band shifts to longer wave length (red shift) after grafting at 262 nm in grafted nanohybrid (NH‐g) which also corroborates the polystyrene grafting on PVDF chains (π→π * transition arising from benzene ring of polystyrene) ,.…”

Section: Uses Of Latent Tracksupporting

confidence: 55%

“…FTIR spectra (Figure a and b ) of PVDF and its nanohybrid specimens show a characteristic absorption band in the wavenumber region of 1610 cm −1 confirming the formation of olefinic double bonds both in PVDF and its nanohybrid. Further, the intensity of the above band increases with increasing fluence indicating greater amount of double bond formation at higher fluence ,. This is to mention that PVDF or its nanohybrid do not exhibit this peak before SHI irradiation.…”

Section: Chemical Changes In Polymer Due To Shi Irradiationmentioning

confidence: 97%

“…Bombardment of swift heavy ions on the thin films of both PVDF and its nanohybrid causes the scission of C‐ C, C‐F and C‐H bonds thereby create free radicals . Electron spin resonance (ESR) studies were employed to detect the free radicals generated in the film (Figure ).…”

Section: Chemical Changes In Polymer Due To Shi Irradiationmentioning

confidence: 99%

See 2 more Smart Citations

New Generation Fuel Cell Membrane Using Swift Heavy Ions

et al. 2017

Self Cite

View full text Add to dashboard Cite

In this review, we focus on the effect of high energy swift heavy ion irradiation on fluoropolymers and their nanohybrids, prepared through dispersion of few weight percentage of organically modified nanoclay in polymer matrix, for the fabrication of new generation fuel cell membrane. A variety of chemical, physical and structural changes are revealed with superior properties in nanohybrid. In addition, radiation resistant nature of the polymer has been discussed with improved properties including formation of nanopores and high proton conductivity of the functionalized nanopores having sufficient mechanical strength which are essential requirements for any fuel cell membrane. Membrane electrode assembly has been demonstrated having very good power density and the developed membrane has the potential to replace the expensive Nafion as standard membrane currently being used in fuel cell membrane. Further, nanoclay induced piezoelectricity in polymer matrix is attractive for the fabrication of a smart membrane using swift heavy ions.[a] Dr.

show abstract

Section: Uses Of Latent Tracksupporting

confidence: 55%

Section: Chemical Changes In Polymer Due To Shi Irradiationmentioning

confidence: 97%

See 1 more Smart Citation

New Generation Fuel Cell Membrane Using Swift Heavy Ions

et al. 2017

Self Cite

View full text Add to dashboard Cite

show abstract

“…In the case of the additive, poly(vinyl difluoridene) powder (Aldrich), used as binder, it gave no EPR signal, which is consistent with previous results obtained by others. 51,52 Galvanostatic cycling and EPR spectroscopy of electrodes composed of few-layer MoS 2 (Ex-MoS 2 ), composite few-layer MoS 2 with carbon nanotubes (Ex-MoS 2 /CNTs), and multilayer MoS 2 with carbon nanotubes (ML-MoS 2 /CNTs) were carried out vs Na.…”

Section: ■ Results and Discussionmentioning

confidence: 94%

“…Hence, the electrochemistry was analyzed under suitable conditions of temperature (RT) and no important contribution of those radicals could be inferred from the in operando spectra and, therefore, the signals arising are most probably exclusively due to the solid-state defects and/or paramagnetic ions referred to in the Introduction. In the case of the additive, poly(vinyl difluoridene) powder (Aldrich), used as binder, it gave no EPR signal, which is consistent with previous results obtained by others. , …”

Section: Resultsmentioning

confidence: 99%

Electrochemical Interaction of Few-Layer Molybdenum Disulfide Composites vs Sodium: New Insights on the Reaction Mechanism

et al. 2017

View full text Add to dashboard Cite

The direct observation of real time electrochemical processes is of great importance for fundamental research on battery materials. Here, we use electron paramagnetic resonance (EPR) spectroscopy to monitor the electrochemical reaction of sodium ions with few-layer MoS2 and its composite with carbon nanotubes (CNTs), thereby uncovering new details of the reaction mechanism. We propose that the sodiation reaction takes place initially in structural defects at the MoS2 surface that have been created during the synthetic process (ultrasonic exfoliation), leading to a decrease in the density of Mo5+ at low symmetry sites that can be related to the electrochemical irreversibility of the process. In the case of the few-layer MoS2/CNTs composite, we found metallic-type conduction behavior for the electrons associated with the Mo paramagnetic centers and improved electrochemical reversibility. The reversible nature of the EPR spectra implies that adsorption/desorption of Na+ ions occurs on the Mo5+ defects, or that they are neutralized during sodiation and subsequently created upon Na+ extraction. These effects help us to understand the higher capacities obtained in the exfoliated samples, as the sum of electrosorption of ions and faradaic effects, and support the suggestion of a different reaction mechanism in the few-layer chalcogenide, which is not exclusively an insertion process.

show abstract

Effects of applied voltage on the morphology and phases of electrospun poly(vinylidene difluoride) nanofibers

Nugraha

Chou

et al. 2022

Polymer International

View full text Add to dashboard Cite

Electrospinning is a simple and flexible process in continuous fiber fabrication. We investigate the effect of applied voltage on morphology and phases of poly(vinylidene difluoride) nanofibers obtained using the electrospinning technique. Quantitative and qualitative analyses were performed employing multiple characterizations such as Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD) and high-resolution transmission electron microscopy (HRTEM). The fiber diameter, affected by the spinning jet's deformation, has non-uniform distribution at low voltages (10-16 kV) and is uniform at higher voltages (20 kV). Fiber uniformity developed due to the increased tension, which shrank the Taylor cone. The highest electroactive fraction (F EA ) of phases was obtained for the smallest diameter fiber with an average diameter of 110 nm at an applied voltage of 20 kV. FTIR spectroscopy and XRD results indicate that the electric field raises the amount of F EA phase to 74% at the present working parameters. HRTEM analysis revealed that the crystallites are very small, with ⊍-phase showing a size of around 10 nm and ⊎-phase is only of nanometric scale. Results also show that the c-axis of ⊍-phase crystallites had a preferred orientation along the fiber axis. On the other hand, the c-axis of ⊎-phase had a preferred orientation perpendicular to the fiber axis, implying that the direction of crystal growth for the ⊍-phase and ⊎-phase was different.

show abstract

Electron beam-induced piezoelectric phase in poly(vinylidene fluoride) nanohybrid: effect at the molecular level

Abstract: An electron beam induces piezoelectric phase in a poly(vinylidene fluoride) nanohybrid containing two‐dimensional nanoclay after stabilizing the polymer free radicals in templates.

Cited by 9 publications

References 41 publications

New Generation Fuel Cell Membrane Using Swift Heavy Ions

New Generation Fuel Cell Membrane Using Swift Heavy Ions

Electrochemical Interaction of Few-Layer Molybdenum Disulfide Composites vs Sodium: New Insights on the Reaction Mechanism

Effects of applied voltage on the morphology and phases of electrospun poly(vinylidene difluoride) nanofibers

Contact Info

Product

Resources

About