scholarly journals A transparent polyvinylidene fluoride–hexafluoropropylene composite film with enhanced energy conversion and energy preservation performance

2021 ◽  
Author(s):  
Xin Wang ◽  
Wenjiang Wang ◽  
Wangshu Tong ◽  
Yihe Zhang ◽  
Zhihao Wang ◽  
...  
Keyword(s):  
Composite Film ◽  
Energy Conversion ◽  
Polyvinylidene Fluoride ◽  
Energy Preservation

scholarly journals Correction: Improved lateral heat spreading performance for polyvinylidene fluoride composite film comprising silver nanowire in light-emitting diode

RSC Advances ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 738-738
Author(s):  
Zhao Li ◽  
Li Zhang ◽  
Rong Qi ◽  
Fan Xie ◽  
Shuhua Qi
Keyword(s):  
Composite Film ◽  
Polyvinylidene Fluoride ◽  
Light Emitting Diode ◽  
Silver Nanowire ◽  
Light Emitting ◽  
Heat Spreading ◽  
Lateral Heat

Correction for ‘Improved lateral heat spreading performance for polyvinylidene fluoride composite film comprising silver nanowire in light-emitting diode’ by Zhao Li et al., RSC Adv., 2016, 6, 35844–35891.

Comparison of Piezoelectric Materials for Vibration Energy Conversion Devices

2006 ◽  
Vol 966 ◽  
Author(s):  
Dongna Shen ◽  
Song-Yul Choe ◽  
Dong-Joo Kim
Keyword(s):  
Energy Conversion ◽  
Power Density ◽  
Polyvinylidene Fluoride ◽  
Piezoelectric Materials ◽  
Fiber Composite ◽  
Maximum Output Power ◽  
Vibration Energy ◽  
Maximum Output ◽  
Mems Devices ◽  
Power Requirement

ABSTRACTPiezoelectric materials have been investigated as vibration energy converters to power wireless devices or MEMS devices due to recent low power requirement of such devices and the development of miniaturization technology. It has shown the potential that piezoelectric power generator can be an alternative to the traditional power source-battery because of facile vibration sources in our environment and the potential elimination of maintenance required for large volume batteries. To date, PZT (Lead Zirconium Titanate) has been commonly exploited as a piezoelectric material for energy conversion since it can generate higher power density even at low-g (< 1 g) vibration environment. Its high fragility, however, can limit its applicability at high-g conditions. Therefore, other types of piezoelectric materials such as polymer and composite are necessary to investigate the applicability at severe vibration conditions. In this study, piezoelectric power generators based on cantilever beam structure were designed, optimized, and fabricated by considering matching the resonant frequency with environmental vibration, achieving maximum output power, and reaching maximum g-value without device failure. As piezoelectric materials, ceramic PZT, polymer PVDF (Polyvinylidene fluoride) and composite MFC (Macro Fiber Composite) were utilized. The energy conversion of all three types of generator devices was systematically evaluated. All three devices were measured to generate enough power density for providing electric energy to wireless sensor or MEMS device. The PZT device shows the highest output energy density and PVDF device has the highest durability to operate at high-g vibration condition.

Synthesis and crystalline properties of CdS incorporated polyvinylidene fluoride (PVDF) composite film

2018 ◽  
Author(s):  
Arunendra Kumar Patel ◽  
Aishwarya Sunder ◽  
Shweta Mishra ◽  
Rakesh Bajpai
Keyword(s):  
Composite Film ◽  
Polyvinylidene Fluoride

Pre-Strained Piezoelectric PVDF Nanofiber Array Fabricated by Near-Field Electrospining on Cylindrical Process for Flexible Energy Conversion

2012 ◽  
Vol 566 ◽  
pp. 462-465 ◽  
Author(s):  
Zong Hsin Liu ◽  
Li Wei Lin ◽  
Cheng Teng Pan ◽  
Zong Yu Ou
Keyword(s):  
Electric Field ◽  
Energy Conversion ◽  
Polyvinylidene Fluoride ◽  
Near Field ◽  
Low Frequency ◽  
Glass Tube ◽  
Copper Electrode ◽  
Ambient Vibration ◽  
Induced Voltage ◽  
Β Phase

In this study, near-field electrospining on hollow cylindrical (NFES) process was used to fabricate permanent piezoelectricity of polyvinylidene fluoride (PVDF) piezoelectric nanofibers. With in situ electric poling, mechanical stretching and heating during NFES process, the pre-strained piezoelectric PVDF nanofibers with high stretchability and energy conversion efficiency can be applied at low-frequency ambient vibration to convert mechanical energies into electrical signals. By adjusting rotating velocity of the hollow cylindrical glass tube on X-Y stage, electric field, baking temperature and carbon nanotube (CNT) concentration in PVDF solution, the crystalline of β phase, polarization intensity and morphology of piezoelectric fiber can be controlled. XRD (X-ray diffraction) observation of PVDF fibers was characterized. With electric field 0.5×107 V/m (needle-to-tube distance 2 mm and DC voltage 5 kV), rotating velocity 400 r.p.m, baking temperature 80 °C and 0.03 wt% CNT in NFES process, it reveals a high diffraction peak at 2θ=20.8° of piezoelectric crystal β-phase structure. Then the array nanofibers were transferred onto a parallel copper electrode by using flexible insulation epoxy/PI film to provide packaging protection. When the sensor was tested under 5 Hz vibration frequency, the maximum induced voltage was 29.4 mVp-p.

scholarly journals Graphene Quantum Dots Doped PVDF(TBT)/PVP(TBT) Fiber Film with Enhanced Photocatalytic Performance

2020 ◽  
Vol 10 (2) ◽  
pp. 596 ◽  
Author(s):  
Fubao Zhang ◽  
Chen Yang ◽  
Xiao-Xiong Wang ◽  
Ru Li ◽  
Zhong Wan ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Composite Film ◽  
Hydrothermal Method ◽  
Polyvinylidene Fluoride ◽  
Photocatalytic Performance ◽  
Graphene Quantum Dots ◽  
Polyvinyl Pyrrolidone ◽  
Tetrabutyl Titanate ◽  
Photocatalytic Efficiency ◽  
Response Range

We report the fabrication of polyvinylidene fluoride (tetrabutyl titanate)/polyvinyl pyrrolidone ((tetrabutyl titanate))-graphene quantum dots [PVDF(TBT)/PVP(TBT)-GQDs] film photocatalyst with enhanced photocatalytic performance. The polyvinylidene fluoride (tetrabutyl titanate)/polyvinyl pyrrolidone ((tetrabutyl titanate)) [PVDF(TBT)/PVP(TBT)] film was first prepared with a dual-electrospinning method and then followed by attaching graphene quantum dots (GQDs) to the surface of the composite film through a hydrothermal method. Later, part of the PVP in the composite film was dissolved by a hydrothermal method. As a result, a PVDF(TBT)/PVP(TBT)-GQDs film photocatalyst with a larger specific surface area was achieved. The photocatalytic degradation behavior of the PVDF(TBT)/PVP(TBT)-GQDs film photocatalyst was examined by using Rhodamine B as the target contaminant. The PVDF(TBT)/PVP(TBT)-GQDs photocatalyst showed a higher photocatalytic efficiency than PVDF(TBT)-H2O, PVDF(TBT)/PVP(TBT)-H2O, and PVDF(TBT)-GQDs, respectively. The enhanced photocatalytic efficiency can be attributed to the broader optical response range of the PVDF(TBT)/PVP(TBT)-GQDs photocatalyst, which makes it useful as an effective photocatalyst under white light irradiation.

Porous flexible polyaniline/polyvinylidene fluoride composite film for trace-level NH3 detection at room temperature

2020 ◽  
Vol 271 ◽  
pp. 127798 ◽  
Author(s):  
Pengyu Yang ◽  
Dawu Lv ◽  
Wenfeng Shen ◽  
Tieyi Wu ◽  
Ye Yang ◽  
...  
Keyword(s):  
Composite Film ◽  
Polyvinylidene Fluoride ◽  
Room Temperature ◽  
Trace Level

Dopamine-Coated Nano-SiO2 Modified PVDF Piezoelectric Composite Film

2021 ◽  
Author(s):  
Lili Wang ◽  
Lulu Liu ◽  
Xiaobiao Shan ◽  
Wenyi Fu
Keyword(s):  
Composite Film ◽  
Polyvinylidene Fluoride ◽  
Solvothermal Method ◽  
Composite Films ◽  
Piezoelectric Composite ◽  
Nano Silica ◽  
Nano Sio2 ◽  
Sem And Tem ◽  
Sio2 Particles

This paper presents a solvothermal method to produce polyvinylidene fluoride (PVDF) composite films doped with dopamine modified nano-silica (dopamine@SiO2) particles. Combined results of FTIR, SEM and TEM confirm that dopamine...

Hot pressing process ameliorates internal defects of PBZ/PVDF composite film for a high electrocaloric effect near room temperature

2021 ◽  
Author(s):  
Guoming Qian ◽  
Kongjun Zhu ◽  
Kang Yan ◽  
Jing Wang ◽  
Jinsong Liu ◽  
...  
Keyword(s):  
Electric Field ◽  
Composite Film ◽  
Hot Pressing ◽  
Polyvinylidene Fluoride ◽  
Organic Polymer ◽  
Interface Problem ◽  
Pvdf Film ◽  
Internal Defects ◽  
Electrocaloric Effect ◽  
The Impact

The poor interface compatibility between inorganic fillers and organic polymer matrix in nanocomposite has presented considerable challenges, which limit the applicable electric field ranges and reduce the interface polarization interaction. In this paper, Pb[Formula: see text]Ba[Formula: see text]ZrO3 (PBZ) nanofibers were introduced into the polyvinylidene fluoride (PVDF) matrix to prepare composite film, and the effect of hot pressing on interface compatibility was investigated at volume composite ratios of 3% and 4%. For the untreated film, [Formula: see text] and [Formula: see text] of the 3 vol.% composite film are 9.68 [Formula: see text]C/cm2 and 401 MV/m, respectively, and those for the 4 vol.% composite film are 9.15 [Formula: see text]C/cm2 and 408 MV/m, respectively. These differences are mainly due to the impact of internal defects. After hot pressing, [Formula: see text] and [Formula: see text] for the 3 vol.% composite film became 10.22 [Formula: see text]C/cm2 and 490 MV/m, respectively. Those for the 4 vol.% composite film are 9.85 [Formula: see text]C/cm2 and 485 MV/m. Experiment and simulation results showed the beneficial effect of hot pressing, which ameliorated poor interfacial compatibility, reduced internal defects, and improved the crystallinity of the composite film. A high electrocaloric effect (ECE) was obtained by using the direct measure method. At −30[Formula: see text]C, the [Formula: see text] values of hot-pressed PBZ/PVDF film at 3[Formula: see text] and 4[Formula: see text] vol.% were 23.81 and 19.73 K, respectively. When temperature increased to 70[Formula: see text]C, the [Formula: see text] values were 9.44 and 7.01 K, respectively, which were 1.58 times of the values of a non-hot-pressed film. These results indicated that hot pressing alleviated the interface problem and resulted in high EC performance under a high-strength electric field.

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