研究目的
To design and fabricate nanoclay-induced electrospun PVDF nanofibers for enhanced piezoelectric response in energy harvesting applications, focusing on structural and morphological alterations, and to demonstrate high output voltage and power density from human body movements.
研究成果
The nanoclay-induced electrospun PVDF nanofibers exhibit enhanced piezoelectric properties with up to 90% electroactive phase, improved mechanical strength (300% tougher and stiffer), and high energy harvesting performance (70 V output voltage and 68 mW/cm2 power density). The device effectively converts waste mechanical energy from human movements into electrical energy, making it suitable for sensors and biomedical applications. Future work should focus on optimizing filler dispersion and exploring other nanocomposites for broader applications.
研究不足
The study may have limitations in scalability for industrial applications, potential agglomeration of nanoclay at higher concentrations (e.g., 20 wt.%), reduced thermal stability compared to pure PVDF, and the need for further optimization for long-term durability and efficiency in real-world environments.
1:Experimental Design and Method Selection:
The study involved electrospinning of PVDF with organically modified nanoclay (Cloisite 30B) at varying concentrations (0, 5, 10, 15, 20 wt.%) to create nanofibers. The electrospinning parameters were optimized (
2:5 kV potential, 5 ml/h flow rate, 10 wt.% solution concentration, 15 cm spinneret-drum distance, and
8 DMF:acetone solvent ratio).
3:Sample Selection and Data Sources:
Samples included pure PVDF nanofibers (P) and nanohybrids with nanoclay (C5, C10, C15, C20). Data were obtained from characterization techniques such as POM, SEM, XRD, FTIR, TGA, DSC, AFM, tensile testing, and electromechanical response measurements.
4:0). Data were obtained from characterization techniques such as POM, SEM, XRD, FTIR, TGA, DSC, AFM, tensile testing, and electromechanical response measurements. List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Materials used were PVDF (SOLEF 6008), nanoclay (Cloisite 30B), DMF, and acetone. Equipment included electrospinning setup, POM (Leitz Biomed), SEM (SUPRA 40, Zeiss), XRD (Rigaku Miniflex 600), FTIR (Nicolet iS5), TGA (Mettler Toledo), DSC (Mettler 832), AFM (NTEGRA Prima, NT-MDT), tensile testing machine (Instron), and oscilloscope (Tektronix TBS 1072B).
5:Experimental Procedures and Operational Workflow:
Solutions were prepared by dissolving PVDF and dispersing nanoclay in DMF, mixing, stirring, and sonicating. Electrospinning was performed with specified parameters. Fibers were characterized for morphology, structure, thermal properties, and mechanical strength. Devices (unimorphs) were fabricated by encapsulating fibers in PDMS with electrodes, and piezoelectric responses were measured under various mechanical stresses.
6:Data Analysis Methods:
Data were analyzed using software tools for deconvolution of XRD peaks, calculation of phase fractions, power density (P = V^2 / (RL * A)), and statistical analysis of mechanical properties.
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Scanning Electron Microscope
SUPRA 40
Zeiss
Used to confirm the surface morphology of the pristine PVDF and nanohybrid scaffolds.
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X-ray Diffractometer
Rigaku Miniflex 600
Rigaku
Used to analyze the extent of dispersion of nanofiller and the nature of crystalline structure in the nanofibers.
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Digital Storage Oscilloscope
Tektronix TBS 1072B
Tektronix
Used to measure the voltage generated from the fabricated devices under mechanical stress.
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PVDF
SOLEF 6008
Ausimont
Used as the base polymer material for electrospinning to create nanofibers with piezoelectric properties for energy harvesting.
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Nanoclay
Cloisite 30B
Southern Clay
Used as a nanofiller to enhance the electroactive phase and piezoelectric response in PVDF nanofibers.
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DMF
Merck
Used as a solvent for dissolving PVDF and dispersing nanoclay during solution preparation for electrospinning.
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Acetone
Merck
Used as a solvent in mixture with DMF for electrospinning solution preparation.
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Polarized Optical Microscope
Leitz Biomed
Leitz
Used to investigate the fibrous morphology of the electrospun nanofiber scaffolds.
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FTIR Spectrometer
Nicolet iS5
Nicolet
Used to obtain different crystalline forms of electrospun fibers and interactions between components.
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Thermogravimetric Analyzer
Mettler Toledo
Used to examine the degradation temperature of pure PVDF and nanohybrid scaffolds.
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Differential Scanning Calorimeter
Mettler 832
Mettler
Used to analyze the melting temperature and heat of fusion of electrospun fibers.
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Atomic Force Microscope
NTEGRA Prima
NT-MDT
Used to observe the scaffold morphology more precisely in semi-contact mode.
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Universal Testing Machine
Instron
Used to record the tensile behavior of the samples under constant strain.
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