electrospinning nanofibers simulation

1. 1
Simulation of Piezoelectric Nanofibers For
Harvesting Energy Applications
Rouabah Sawsen and Chaabi Abdelhafid
University of Constantine
Science and Technology Faculty
Electronic Departement
Laboratory of Hyperfrequencies and Semi-conductor
(LHS)
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2. 2
OVERVIEW
Introduction
Comsol Simulation
Conclusion
1
3
2
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3. 3
Introduction
Introduction
Piezoelectric Nanofibers
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4. 4
Introduction
Ferroelectric materials
Piezoelectric
Materials
Transducers Sensors Actuators
Energy Harvesting

5. 5
Introduction
Mechanical
Energy
Vibratory
Electrical
energy
Level low
Electrical
Energy
High level
Direct effect
Piezoelectric Effect
Inverse piezoelectric
effect
Inverse piezoelectric effect
Piezoelectric
material
Electrical field (voltage)
Electrical displacement
(Current)
Displacement
(Deformations)
Strain
(Stress)
Direct effect

6. 6
Introduction
The miniaturisation of the sizes
Energy Harvesting technologies
Power
harvesting
Energy
scavenging
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7. Piezoelectric Nanofibers
J. Chang; M Dommer, C. Chang; L. Lin, Piezoelectric nanofibers for energy scavenging applications, Elsevier nano energy,1, 356-371 (2012)
The nanofibers are constructed by electrospining process using piezoelectric materials
After constructing , they deposited on the prepared interdigitated electrodes
They deposited on a silicon substrate
Piezoelectric
nanofibers
polymer
Silicon
Electrodes
1
2
3
4
4
1
2
3 PEHD was applied on the top

8. 8
Structure and Design
Selected Materials
Comsol Simulation
Mesh
Results
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9. 9
Structure and Design
START
The dimensions of each part:
Pressure

10. 10
Selected Materials
Selected Materials:
For the nanofibers: PZT 5H (Lead Zirconate Titanate).
The polymer used: PEHD ( Polyethylene).
For the electrodes: The copper
Polarization:
We apply a pressure on the surface
of the polymer to 50N/m^2
Definition
Piezoelectric
devices
Boundary load
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11. 11
Mesh
Electrode boundary conditions:
The high of Electrodes  Terminal
The other face of electrodes  Ground (GND)
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12. 12
Mesh
Mesh:
Physics controlled
mesh
Element size extra
coarse
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13. 13
Results
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At 50N/m^2 At 10N/m^2
Output volage depending on frequencies

14. 14
Conclusion
Next work……
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Optimization our piezoelectric nanofibers
Change our polymer to a flexible one…..?
The piezoelectric nanofibers are simulated using Comsol Multiphysics software, which is
very useful for this study
Piezoelectric nanogenerator based on lead zirconate titanate nanofibers, shows that
piezoelectric voltage is high and powerful for energy harvesting.

15. 15
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