PVDF Nanofiber Sensor for Vibration Measurement in a String

Singh, Rahul Kumar; Lye, Sun Woh; Miao, Jianmin

doi:10.3390/s19173739

Cited by 33 publications

(27 citation statements)

References 67 publications

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“…34 Electrospinning typically yields b-phase PVDF; however, the amount of this phase strongly depends on operating parameters of the electrospinning setup such as the flowrate distance of the collector, and voltage. 33 The observed melting point for b-phase PVDF according to Singh et al is approximately 158 C, 33 which is in close agreement with the melting point measured in the presented results. This has been studied thoroughly by different groups and can be explained by the formation mechanism of electrospun nanofibers along with the molecular structure of PVDF.…”

Section: Characterization Of Nano-reinforcement Layerssupporting

confidence: 89%

Assessing the performance of electrospun nanofabrics as potential interlayer reinforcement materials for fiber-reinforced polymers

Loizou

Evangelou

Marangos

et al. 2021

Composites and Advanced Materials

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Multiscale-reinforced polymers offer enhanced functionality due to the three different scales that are incorporated; microfiber, nanofiber, and nanoparticle. This work aims to investigate the applicability of different polymer-based nanofabrics, fabricated via electrospinning as reinforcement interlayers for multilayer-fiber-reinforced polymer composites. Three different polymers are examined; polyamide 6, polyacrylonitrile, and polyvinylidene fluoride, both plain and doped with multiwalled carbon nanotubes (MWCNTs). The effect of nanotube concentration on the properties of the resulting nanofabrics is also examined. Nine different nanofabric systems are prepared. The stress–strain behavior of the different nanofabric systems, which are eventually used as reinforcement interlayers, is investigated to assess the enhancement of the mechanical properties and to evaluate their potential as interlayer reinforcements. Scanning electron microscopy is employed to visualize the morphology and microstructure of the electrospun nanofabrics. The thermal behavior of the nanofabrics is investigated via differential scanning calorimetry to elucidate the glass and melting point of the nanofabrics, which can be used to identify optimum processing parameters at composite level. Introduction of MWCNTs appears to augment the mechanical response of the polymer nanofabrics. Examination of the mechanical performance of these interlayer reinforcements after heat treatment above the glass transition temperature reveals that morphological and microstructural changes can promote further enhancement of the mechanical response.

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Section: Characterization Of Nano-reinforcement Layerssupporting

confidence: 89%

Assessing the performance of electrospun nanofabrics as potential interlayer reinforcement materials for fiber-reinforced polymers

Loizou

Evangelou

Marangos

et al. 2021

Composites and Advanced Materials

View full text Add to dashboard Cite

show abstract

“…Similar results were found by Jiyong et al, concluding that the feed rate and F(β) have a significant inverse relationship, since the F(β) of PVDF nanofibers decreases from 78% to 72%, with an increase of the flow rate from 0.5 to 2.0 mL/h [ 89 ]. On the other hand, Singh et al have demonstrated the increase in the β phase due to the increase in flow rate is related to the shear force exerted by a needle on a viscous polymeric solution [ 90 ]. Furthermore, they have denoted that the F(β) increases until a critical value of the flow rate (2 mL/h) and then decreases.…”

Section: Effect Of Electrospinning Parameters On the β Phase And Tmentioning

confidence: 99%

Electrospun PVDF Nanofibers for Piezoelectric Applications: A Review of the Influence of Electrospinning Parameters on the β Phase and Crystallinity Enhancement

et al. 2021

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Polyvinylidene fluoride (PVDF) is among the most attractive piezo-polymers due to its excellent piezoelectricity, lightweight, flexibility, high thermal stability, and chemical resistance. PVDF can exist under different forms of films, membranes, and (nano)fibers, and its piezoelectric property related to its β phase content makes it interesting for energy harvesters and wearable applications. Research investigation shows that PVDF in the form of nanofibers prepared by electrospinning has more flexibility and better air permeability, which make them more suitable for these types of applications. Electrospinning is an efficient technique that produces PVDF nanofibers with a high β phase fraction and crystallinity by aligning molecular dipoles (–CH2 and –CF2) along an applied voltage direction. Different nanofibers production techniques and more precisely the electrospinning method for producing PVDF nanofibers with optimal electrospinning parameters are the key focuses of this paper. This review article highlights recent studies to summarize the influence of electrospinning parameters such as process (voltage, distance, flow rate, and collector), solution (Mw, concentration, and solvent), and ambient (humidity and temperature) parameters to enhance the piezoelectric properties of PVDF nanofibers. In addition, recent development regarding the effect of adding nanoparticles in the structure of nanofibers on the improvement of the β phase is reviewed. Finally, different methods of measuring piezoelectric properties of PVDF nanofibrous membrane are discussed.

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“…They received piezoelectric PVDF fibers with a small diameter, smooth surface morphology, and appropriate β-phase at a velocity of 1900 rpm. Recent works support the view that increasing of the rotational speed of the collector induces a higher content of the piezoelectric β-phase [182][183][184].…”

Section: Synthetic Polymers Polyvinylidene Fluoridementioning

confidence: 78%

Piezoelectric Scaffolds as Smart Materials for Neural Tissue Engineering

2020

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Injury to the central or peripheral nervous systems leads to the loss of cognitive and/or sensorimotor capabilities, which still lacks an effective treatment. Tissue engineering in the post-injury brain represents a promising option for cellular replacement and rescue, providing a cell scaffold for either transplanted or resident cells. Tissue engineering relies on scaffolds for supporting cell differentiation and growth with recent emphasis on stimuli responsive scaffolds, sometimes called smart scaffolds. One of the representatives of this material group is piezoelectric scaffolds, being able to generate electrical charges under mechanical stimulation, which creates a real prospect for using such scaffolds in non-invasive therapy of neural tissue. This paper summarizes the recent knowledge on piezoelectric materials used for tissue engineering, especially neural tissue engineering. The most used materials for tissue engineering strategies are reported together with the main achievements, challenges, and future needs for research and actual therapies. This review provides thus a compilation of the most relevant results and strategies and serves as a starting point for novel research pathways in the most relevant and challenging open questions.

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PVDF Nanofiber Sensor for Vibration Measurement in a String

Cited by 33 publications

References 67 publications

Assessing the performance of electrospun nanofabrics as potential interlayer reinforcement materials for fiber-reinforced polymers

Assessing the performance of electrospun nanofabrics as potential interlayer reinforcement materials for fiber-reinforced polymers

Electrospun PVDF Nanofibers for Piezoelectric Applications: A Review of the Influence of Electrospinning Parameters on the β Phase and Crystallinity Enhancement

Piezoelectric Scaffolds as Smart Materials for Neural Tissue Engineering

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