scholarly journals Solution Blow Spinning of Polyvinylidene Fluoride Based Fibers for Energy Harvesting Applications: A Review

Polymers ◽  
2020 ◽  
Vol 12 (6) ◽  
pp. 1304 ◽  
Author(s):  
Rasheed Atif ◽  
Jibran Khaliq ◽  
Madeleine Combrinck ◽  
Ahmed H. Hassanin ◽  
Nader Shehata ◽  
...  
Keyword(s):  
Energy Harvesting ◽  
Polyvinylidene Fluoride ◽  
High Efficiency ◽  
Piezoelectric Materials ◽  
Critical Parameters ◽  
High Yield ◽  
Solution Blow Spinning ◽  
Service Conditions ◽  
Key Aspects ◽  
Operational Simplicity

Polyvinylidene fluoride (PVDF)-based piezoelectric materials (PEMs) have found extensive applications in energy harvesting which are being extended consistently to diverse fields requiring strenuous service conditions. Hence, there is a pressing need to mass produce PVDF-based PEMs with the highest possible energy harvesting ability under a given set of conditions. To achieve high yield and efficiency, solution blow spinning (SBS) technique is attracting a lot of interest due to its operational simplicity and high throughput. SBS is arguably still in its infancy when the objective is to mass produce high efficiency PVDF-based PEMs. Therefore, a deeper understanding of the critical parameters regarding design and processing of SBS is essential. The key objective of this review is to critically analyze the key aspects of SBS to produce high efficiency PVDF-based PEMs. As piezoelectric properties of neat PVDF are not intrinsically much significant, various additives are commonly incorporated to enhance its piezoelectricity. Therefore, PVDF-based copolymers and nanocomposites are also included in this review. We discuss both theoretical and experimental results regarding SBS process parameters such as solvents, dissolution methods, feed rate, viscosity, air pressure and velocity, and nozzle design. Morphological features and mechanical properties of PVDF-based nanofibers were also discussed and important applications have been presented. For completeness, key findings from electrospinning were also included. At the end, some insights are given to better direct the efforts in the field of PVDF-based PEMs using SBS technique.

Load-Tolerant, High-Efficiency Self-Powered Energy Harvesting Scheme Using a Nonlinear Approach

2014 ◽  
Vol 1 (3-4) ◽  
Author(s):  
Mickaël Lallart ◽  
Claude Richard ◽  
Yang Li ◽  
Yi-Chieh Wu ◽  
Daniel Guyomar
Keyword(s):  
Energy Harvesting ◽  
High Efficiency ◽  
Piezoelectric Materials ◽  
Small Scale ◽  
Energy Scavenging ◽  
Resistive Load ◽  
Vibration Energy Harvesting ◽  
New Approach ◽  
Nonlinear Approach ◽  
Self Powered

AbstractSmall-scale energy harvesting has become a particularly hot topic for replacing batteries in autonomous or nomad systems. In particular, vibration energy harvesting using piezoelectric elements has experienced a significant amount of research over the last decade as vibrations are widely available in many environments and as piezoelectric materials can be easily embedded. However, the energy scavenging abilities of such systems are still limited and are very sensitive to the connected load. The purpose of this paper is to expose a new approach based on synchronous switching on resistive load, which allows both a significant enhancement of the energy harvesting capabilities as well as a high tolerance to a change of the impedance of the connected system, especially in the low value region. It is theoretically and experimentally shown that such an approach permits increasing the energy harvesting abilities by a factor 4 compared to classical DC energy harvesting approach. Furthermore, the self-powering possibility and automatic load adaptation of the proposed method is experimentally discussed, showing the realistic viability of the technique.

Enhanced Piezoelectric Performance of Electrospun PVDF-MWCNT-Cu Nanocomposites for Energy Harvesting Application

NANO ◽  
2020 ◽  
Vol 15 (04) ◽  
pp. 2050049 ◽  
Author(s):  
Ramadoss Tamil Selvan ◽  
Choo Yan Jia ◽  
W. A. D. M. Jayathilaka ◽  
Amutha Chinappan ◽  
Hilaal Alam ◽  
...  
Keyword(s):  
Energy Harvesting ◽  
Lead Zirconate Titanate ◽  
Polyvinylidene Fluoride ◽  
Composite Nanofibers ◽  
Piezoelectric Materials ◽  
Mechanical Energy ◽  
Polymeric Materials ◽  
Multiwalled Carbon ◽  
Peak Voltage ◽  
Piezoelectric Device

Piezoelectric principle is one of the popular choices when it comes to mechanical energy recovery and conversion of energy into electrical energy which can be either stored or used straightaway. In general, ceramic-based piezoelectric materials like Lead Zirconate Titanate (PZT) had been the popular choice for piezoelectric devices even though they are brittle in nature and found to be toxic in long uses. At the same time, organic-based Polyvinylidene Fluoride (PVDF) and similar polymeric materials have been used in different applications with an offer of flexibility, lightweight and biocompatibility. One major factor dragging down the usage of organic materials in piezoelectric applications is their poor piezoelectric responses. In this work, authors are reporting the enhanced piezoelectric properties of nanofibers of PVDF in composite with copper nanoparticles and Multiwalled Carbon Nanotubes (MWCNTs). Fourier Transformation Infrared (FTIR) analysis has been carried out for nanofibers and was able to prove the higher beta phase conversion of PVDF in composite nanofibers when compared with pristine nanofibers. Composite nanofibers were later fabricated into a piezoelectric device with two electrodes and have shown a peak voltage of 6.78 V upon a drop test. As a proof of concept, the mentioned piezoelectric device was integrated into a shoe-based prototype where it has shown 18–20[Formula: see text]V energy harvesting upon walking at leisurely pace.

Investigation of Energy Harvest Using a Piezoelectric Unimorph Post-Buckled by a Stretching Spring

2014 ◽  
Vol 613 ◽  
pp. 193-199
Author(s):  
Sheng Fu Sun ◽  
Wei Jie Dong ◽  
Yan Cui
Keyword(s):  
Energy Harvesting ◽  
Output Power ◽  
Elastic Energy ◽  
High Efficiency ◽  
Piezoelectric Materials ◽  
Initial Energy ◽  
Open Circuit ◽  
Energy Harvest ◽  
Standard Device ◽  
Piezoelectric Unimorph

Pre-stressed piezoelectric unimorphs show enhanced actuation displacements and high efficiency of energy harvesting compared with conventional unimorphs. A method to increase the amount of stored energy by injecting elastic energy to energy harvesting system consisting of the THUNDER device is described in this paper. A stretching spring is mounted on the two tabs of THUNDER device in order to inject energy to the system. The mechanical stress applied on THUNDER device results in an increase in the initial stored mechanical and elastic energy, which contribute to the improved response of the modified device. In experiment, two different springs were added on the THUNDER device: one's initial length is 17mm with k=45N/m and another is 33mm with k=145N/m. For the THUNDER device with a spring of k=145N/m and a proof mass of 8.2g, the maximum open circuit VRMS was 29.4V, and output power of 4.53mW was obtained by a load resistor of 90 kΩ at vibration frequency of 51Hz. Compared with standard device, the energy density or the output power at resonance frequency increased by 74.4%. The displacement performance of the modified devices was larger than that of the standard device. Through measurements and analysis, after a stretching spring was attached to the THUNDER device, dielectric constant did not change obviously, while d31 increased a lot. We can conclude that the improvement of energy harvesting is mainly due to the increase of d31 and stress distribution in the THUNDER device. Furthermore, the use of an initial energy injection mechanism based on a nonlinear approach can artificially enhance the conversion abilities of piezoelectric materials.

scholarly journals Study of Air Pressure and Velocity for Solution Blow Spinning of Polyvinylidene Fluoride Nanofibres

Processes ◽  
2021 ◽  
Vol 9 (6) ◽  
pp. 1014
Author(s):  
Rasheed Atif ◽  
Madeleine Combrinck ◽  
Jibran Khaliq ◽  
James Martin ◽  
Ahmed H. Hassanin ◽  
...  
Keyword(s):  
Polymer Solution ◽  
Polyvinylidene Fluoride ◽  
Fibre Diameter ◽  
Flow Characteristics ◽  
Air Pressure ◽  
Compressed Air ◽  
Input Pressure ◽  
Solution Blow Spinning ◽  
Fibre Morphology ◽  
Operational Simplicity

Solution blow spinning (SBS) is gaining popularity for producing fibres for smart textiles and energy harvesting due to its operational simplicity and high throughput. The whole SBS process is significantly dependent on the characteristics of the attenuation force, i.e., compressed air. Although variation in the fibre morphology with varying air input pressure has been widely investigated, there is no available literature on the experimentally determined flow characteristics. Here, we have experimentally measured and calculated airflow parameters, namely, output air pressure and velocity in the nozzle wake at 12 different pressure values between 1 and 6 bar and 11 different positions (retracted 5 mm to 30 mm) along the centreline. The results obtained in this work will answer many critical questions about optimum protrusion length for the polymer solution syringe and approximate mean fibre diameter for polyvinylidene fluoride (PVDF) at given output air pressure and velocity. The highest output air pressure and velocity were achieved at a distance of 3–5 mm away from the nozzle wake and should be an ideal location for the apex of the polymer solution syringe. We achieved 250 nm PVDF fibres when output air pressure and velocity were 123 kPa and 387 m/s, respectively.

scholarly journals Development of poly (vinylidene fluoride)/silver nanoparticle electrospun nanofibre mats for energy harvesting

2021 ◽  
pp. 096739112110420
Author(s):  
Roopa Thotadara Shivalingappa ◽  
Hebbale Narayana Rao Narasimha Murthy ◽  
Pradeep Purushothaman ◽  
Prasanna Badiger ◽  
Swapnil Savarn ◽  
...  
Keyword(s):  
Energy Harvesting ◽  
Polyvinylidene Fluoride ◽  
Vinylidene Fluoride ◽  
Piezoelectric Materials ◽  
Applied Pressure ◽  
Fibre Diameter ◽  
X Ray Diffraction ◽  
Β Phase ◽  
Fourier Transformed Infrared Spectroscopy ◽  
Poly Vinylidene Fluoride

Energy harvesting using piezoelectric materials finds attention of researchers due to miniaturisation. Polyvinylidene fluoride (PVDF) is one such polymeric material with high piezoelectric and pyroelectric properties and hence is used for sensors, actuators, energy harvesting and biomedical devices. This study reports electrospinning of PVDF/Ag nanoparticles (AgNP) nanofibre mats for energy harvesting. Nanofibre mats were prepared by adopting voltage (20 kV), flow rate (1.5 mL/hour) and tip to collector distance (19 cm). The fibre mats were characterised using Fourier-Transformed Infrared Spectroscopy (FTIR), X-Ray Diffraction (XRD) and Scanning Electron Microscopy (SEM). FTIR and XRD results showed 11.84% and 36.36% increase in β-phase and crystallinity, respectively, due to the addition of 1.5 wt. % AgNP to PVDF. SEM micrographs showed decrease in bead formation and increase in fibre diameter from 40 nm to 355 nm due to the addition of AgNP. Sensitivity and voltage output were studied. The fibre mats were used for development of a miniature burglar alarm system, and its response to the applied pressure was tested.

scholarly journals Preparation of Nanofibrous PVDF Membrane by Solution Blow Spinning for Mechanical Energy Harvesting

Nanomaterials ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 1090 ◽  
Author(s):  
Rui-Qiang Liu ◽  
Xiao-Xiong Wang ◽  
Jie Fu ◽  
Qian-Qian Zhang ◽  
Wei-Zhi Song ◽  
...  
Keyword(s):  
Energy Harvesting ◽  
High Efficiency ◽  
Vinylidene Fluoride ◽  
Mechanical Energy ◽  
Electronic Textiles ◽  
Poly Vinylidene Fluoride ◽  
Potential Applications ◽  
Solution Blow Spinning ◽  
Self Powered ◽  
Nanofiber Mats

Self-powered nanogenerators composed of poly(vinylidene fluoride) (PVDF) have received much attention. Solution blow spinning (SBS) is a neoteric process for preparing nanofiber mats with high efficiency and safely, and SBS is a mature fiber-forming technology that offers many advantages over conventional electrospinning methods. Herein, we adopted the SBS method to prepare independent PVDF nanofiber membranes (NFMs), and successfully employed them as nanogenerators. Finally, we tested the change in the output current caused by mechanical compression and stretching, and studied its durability and robustness by charging the capacitor, which can drive tiny electronic devices. The results show that the PVDF nanogenerators by using this SBS equipment can not only be used in wearable electronic textiles, but are also suitable for potential applications in micro-energy harvesting equipment.

Energy Harvesting Using Piezoelectric Materials on Microcantilevr Structure

2012 ◽  
Vol 2 (5) ◽  
pp. 252-255
Author(s):  
Rudresha K J Rudresha K J ◽  
◽  
Girisha G K Girisha G K
Keyword(s):  
Energy Harvesting ◽  
Piezoelectric Materials

Developing a Strategy for the Digital Transformation of an Enterprise with Allowance for the Capabilities of Business Ecosystems

2020 ◽  
Vol 26 (6) ◽  
pp. 629-642
Author(s):  
T. A. Gileva ◽  
A. V. Babkin ◽  
G. A. Gilev
Keyword(s):  
High Efficiency ◽  
Direct Interaction ◽  
Digital Transformation ◽  
Business Trend ◽  
Digital Environment ◽  
Digital Platforms ◽  
Business Ecosystems ◽  
Key Aspects ◽  
Enterprise's Competitiveness ◽  
Transformation Strategy

The presented study analyzes the processes of creating ecosystems in the context of external challenges and increasing the level of competitive market environment and global digitalization of business to develop a strategy for the digital transformation of an enterprise.Aim. The study aims to assess the practicability of creating ecosystems when developing a strategy for the digital transformation of traditional (“defensive”) enterprises and to provide recommendations for their utilization.Tasks. The authors analyze the characteristics, features, and typology of business ecosystems; substantiate the need to analyze and use the capabilities of business ecosystems in the development of a strategy for corporate development in the digital environment; describe the essence, key aspects of development, and propose a modular structure for the strategy of the digital transformation of an enterprise; develop a conceptual framework for the strategic management of the digital transformation of an enterprise; formulate recommendations for selecting ecosystems that would enhance the enterprise’s competitiveness.Methods. This study uses general scientific methods of cognition in various aspects to propose approaches and a conceptual model of the corporate digital transformation strategy with allowance for the capabilities of business ecosystems.Results. The authors show that in the context of the developing digital economy, business ecosystems have become a new way to organize economic activity due to their high efficiency and rapid scaling. There are two major types of ecosystems: centralized (transaction) ecosystems in the form of digital platforms and adaptive (solution) ecosystems formed by the orchestrating company to create a new value proposition by joint efforts of partners from various industries through direct interaction with each other. The study identifies stages in the development of a digital transformation strategy based on enhancing the enterprise’s competitiveness through its participation in the ecosystem(s) and formulate recommendations for selecting ecosystems that would improve the efficiency of the enterprise.Conclusions. Ecosystem development is a business trend that determines the competitiveness of enterprises and improves the efficiency of their operation in the digital environment. Therefore, under modern conditions, an enterprise should develop its digital transformation strategy based on the creation and/or use of business ecosystems.

Synthesis of 3,4-Dihydropyrano[c]chromenes Using Carbon Microsphere Supported Copper Nanoparticles (Cu-NP/C) Prepared from Loaded Cation Exchange Resin as a Catalyst

2019 ◽  
Vol 16 (2) ◽  
pp. 288-293
Author(s):  
Yogesh W. More ◽  
Sunil U. Tekale ◽  
Nitishkumar S. Kaminwar ◽  
László Kótai ◽  
Tibor Pasinszki ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Cation Exchange ◽  
Copper Nanoparticles ◽  
Exchange Resin ◽  
Cation Exchange Resin ◽  
Environmentally Benign ◽  
High Yield ◽  
Carbon Microsphere ◽  
Catalytic Material ◽  
Operational Simplicity

Aim and Objective: The present study was performed with the aim to develop an efficient and environmentally benign protocol for the synthesis of biologically siginifcant 3, 4-dihydropyrano[c]chromenes using a new catalytic material. The protocol involves the use of a reusable, environment friendly materials and solvents with operational simplicity. Materials and Methods: Carbon microsphere supported copper nanoparticles (Cu-NP/C) prepared from loaded cation exchange resin were synthesized, characterized with well versed analytical techniques such as XRD, SEM and Raman spectroscopy and the synthesized material was used as a catalyst for the environmentally benign synthesis of 3,4-dihydropyrano[c]chromenes. Results: The formation of carbon microsphere supported copper nanoparticles (Cu-NP/C) prepared from loaded cation exchange resin was confirmed by XRD, SEM and Raman spectroscopy which was employed as a heterogeneous material for the synthesis of 3,4-dihydropyrano[c]chromenes. The products formed were characterized by the analysis of spectroscopic data - NMR, IR and mass. The safe catalytic system offers several advantages including operational simplicity, environmental friendliness, high yield, and reusability of catalyst and green chemical transformation. Conclusion: Herein we report an easy and efficient protocol for the one-pot synthesis of dihydropyrano[ c]chromenes using environmentally benign MCR approach in ethanol as the green solvent. The method developed herein constitutes a valuable addition to the existing methods for the synthesis of titled compounds.

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