Friction properties of biological functional materials: PVDF membranes

Chen, Long; Di, Changán; Chen, Xuguang; Li, Zhengzhi; Luo, Jia Qi

doi:10.1080/21655979.2016.1227612

Cited by 3 publications

(3 citation statements)

References 11 publications

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“…In recent years, flexible sensors have received tremendous attention and are widely used in wearable electronics, intelligent robots, electronic skin, etc. − Pressure sensors based on mechanical-to-electrical signal conversion can be divided into three main categories, namely piezoelectric, piezoresistive, and capacitive types. − Among them, piezoelectric sensors are characterized by the advantages of being self-powered, having a simple structure, and having a fast response time. − Piezoelectric ceramics such as Pb(Zr,Ti)O 3 , KNaNbO 3 , and BaTiO 3 are widely used in energy harvesters and pressure sensors due to their high piezoelectric response, but their inherent brittleness limits their application in flexible electronic devices. − Thus, polymer-based piezoelectric composites with benign flexibility and excellent piezoelectric properties were developed, in which polyvinylidene fluoride (PVDF) was selected as the matrix. − To improve the piezoelectricity of PVDF-based composites, two categories are adopted. The first strategy is to dope ceramic fillers with high piezoelectricity into the PVDF matrix.…”

Section: Introductionmentioning

confidence: 99%

Chitosan-Doped PVDF Film with Enhanced Electroactive β Phase for Piezoelectric Sensing

Zhou,

Zhang,

et al. 2024

ACS Appl. Electron. Mater.

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Polymer-based piezoelectric composites have shown a large potential in various fields of wearable electronics, man−machine interaction, transducers, etc., due to their integrated advantages of high piezoelectric properties, benign flexibility, and pressure sensitivity. As the representative polymer matrix in piezoelectric composites, polyvinylidene fluoride (PVDF) is characterized by its intrinsic piezoelectric response induced via the existence of ferroelectric β and γ phases. However, the most stable phase at ambient temperature and pressure is the nonpolar and paraelectric α phase, which serves as a longstanding issue. Herein, chitosan was introduced into the PVDF matrix to promote the transition from α phase to β phase via the interaction between the −OH and −NH 2 groups in chitosan and the H and F atoms in PVDF. As evidenced, the portion of the β phase increased from 47.9 to 63.7%. An electrospinning technique was adopted to prepare PVDF/ chitosan composites with a chitosan content ranging from 1 to 4 wt %, and the correlation between structural characteristics and piezoelectric properties is illustrated in detail. Then, a flexible pressure sensor based on PVDF/chitosan composite was prepared, which presents a low detection limit of ∼220 Pa in a wide range of 220 Pa−81 kPa. The pressure sensor presents a good capability for detecting pulse signals and speech recognition accurately. As well demonstrated in this work, the treatment of PVDF with low-cost chitosan may boost its practical application in future flexible electronics.

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Section: Introductionmentioning

confidence: 99%

Chitosan-Doped PVDF Film with Enhanced Electroactive β Phase for Piezoelectric Sensing

Zhou,

Zhang,

et al. 2024

ACS Appl. Electron. Mater.

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“…PVDF (polyvinylidene fluoride) thin film is a kind of important piezoelectric thin film, and is widely used in many smart devices. Since these devices are often used in the vibrational environment, fretting wear will inevitably occur at the contact surface of PVDF thin films, and even lead to the failure of devices [ 10 , 11 ]. Fretting wear usually occurs as a relative oscillatory movement between contacting surfaces with a low amplitude of the micron scale.…”

Section: Introductionmentioning

confidence: 99%

Experimental Studies on Fretting Wear Behavior of PVDF Piezoelectric Thin Films

Shu

et al. 2021

Materials

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This paper discusses an in-depth experimental study on the fretting wear behavior of PVDF (polyvinylidene fluoride) piezoelectric thin film against a Si3N4 ceramic sphere under air conditions. A fretting wear device with a ball-on-plate contact configuration was applied. The changes of displacement amplitude, normal force, and applied voltage were taken into account. The friction logs were used to determine the contact state of the PVDF thin film during the fretting test. The 3D topography instrument and scanning electron microscope (SEM) were used to measure the details of the surface morphology and wear volume. The test results of PVDF thin films under different normal force, displacement amplitude, and applied voltage are summarized through the collection and analysis of experimental data. It is shown that the creep and plastic deformation lead to obvious winkles at the contact surface, which may decrease the specific wear rate of PVDF thin films.

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“…Poly(vinylidene fluoride) (PVDF) is a very important engineering polymer with broad applications in electronics, purification/separation, and biological applications . These works mostly focused on two aspects of PVDF microstructures: (1) crystalline polymorphs of PVDF and (2) porous structures .…”

Section: Introductionmentioning

confidence: 99%

Effective structure regulation of poly(vinylidene fluoride) via soy protein isolate: A morphological study

Zheng¹,

Cox²,

Li³

2018

J of Applied Polymer Sci

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The microstructures of poly(vinylidene fluoride) (PVDF)/soy protein isolate (SPI) films were successfully modulated via denatured SPIs. While vegetable proteins have been extensively researched as functional biomaterials in fabrication of polymer blends, the diverse polymer‐protein interactions because of complex protein structures have not received sufficient attention. In this study, the PVDF‐SPI interactions were tuned by different denaturation treatments including heat, sonication, and chemical denaturation by 2‐mercaptoethanol and sodium dodecyl sulfate, respectively. Phase morphologies, crystal structures of PVDF, and secondary structures of SPI were analyzed by scanning electron microscope, fluorescence imaging, X‐ray diffraction, and Fourier transformed infrared spectroscopy. While 90 °C denaturation and sodium dodecyl sulfate led to nonporous structures, all other denatured SPIs produced distinctive porous structures. The crystallinity of PVDF was reduced to different degrees, depending on the denaturation of SPI. The distinctive microstructures of PVDF/SPI films indicated the diversity of PVDF‐SPI interactions and its importance in functional polymer/protein blends. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 134, 46706

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Friction properties of biological functional materials: PVDF membranes

Cited by 3 publications

References 11 publications

Chitosan-Doped PVDF Film with Enhanced Electroactive β Phase for Piezoelectric Sensing

Chitosan-Doped PVDF Film with Enhanced Electroactive β Phase for Piezoelectric Sensing

Experimental Studies on Fretting Wear Behavior of PVDF Piezoelectric Thin Films

Effective structure regulation of poly(vinylidene fluoride) via soy protein isolate: A morphological study

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