Discipline: Technology and Engineering
Subcategory: Civil/Mechanical/Manufacturing Engineering
KAILASH CHANDRA SHIVAJI PATURI - University of North Texas
Co-Author(s): K. M. Lee, Mississippi College A Christian University, Clinton, Mississippi; T. Y. Choi and A. Krokhin, University of North Texas, Denton, TX
The objective of the project is to perform analyses on the piezoelectric materials by subjecting it to maximum vibration and thereby recording the output voltage achieved by them. Experiments use polyvinylidene fluoride (PVDF) polymer which is a piezoelectric material and is fabricated in the form of thin film, which in turn is sandwiched between polyethylene terephthalate (PET) film. PVDF compared to other polymers has high purity, lightweight, flexibility, resistance to solvents, and stability under high electric fields . It has been studied that PVDF nanofibers have been mainly used for the application in the energy harvesting and battery separators .PVDF pallets (2grams) with DMF (4 ml) and acetone (6 ml) in the ratio of 4:6 is added to the vile along with a magnet for stirring. The vile is then sealed of using a parafilm, which is then placed on a magnetic stirrer at the temperature of 108 degrees C and 1200 rpm for 3 hours. The syringe was loaded with 2 ml solution and angle was adjusted to 15 degrees, the drum collector was adjusted to 1000rpm and drum collector- syringe distance is at 15 cm and 23 gauge. The flow rate was set to 350µL/hr. Device Fabrication- The PET film was sputter coated with electrode (nickel) of desired thickness 100 nm and the PVDF nanofiber film obtained from electrospinning was cut to specific dimensions 3 x 4 cm2 and sandwiched between the PET electrodes. The sample was connected to a digital multimeter (Agilent 34401A multimeter) and subjected to loading through sound load by setting a frequency range from 20 Hz to 20 kHz. Responses to mechanical vibration were measured to be the maximum of 225 mV ac and 43 mV dc, which were about 50 and 100 times higher than the background noise. The parameter selection of the electrospinning plays a crucial role in the output and fibers alignment. In previous studies PVDF fibers were not focused on the alignment of the fibers, where the fibers alignment has a good relation to the vibrations. The electrode selected was nickel compared to copper (highly conductive), and the device was able to produce a significant voltage output.Future study can be a multilayered PVDF films, and another possible study could be electrode comb structure, which can maximize collection efficiency by increasing the surface area of PVDF film.References:  He, Z., Rault, F., Lewandowski, M., Mohsenzadeh, E., Salaün, F. 2021, 13, 174. Electrospun PVDF Nanofibers for Piezoelectric Applications: A Review of the Influence of Electrospinning Parameters on the β Phase and Crystallinity Enhancement. Polymers,13(2):174. Ribeiro, C., Costa, C., Correia, D. et al Electroactive poly (vinylidene fluoride)-based structures for advanced application, Nature Protocols 13, 681–704 (2018).
Funder Acknowledgement(s): This work was supported by EFRI Grant No. 1741677 from the National Science Foundation
Faculty Advisor: T. Y. Choi, firstname.lastname@example.org
Role: PVDF pallets (2grams) with DMF (4 ml) and acetone (6 ml) in the ratio of 4:6 is added to the vile along with a magnet for stirring. The vile is then placed on a magnetic stirrer at the temperature of 108 degrees C and 1200 rpm for 3 hours. The syringe was loaded with 2 ml solution and angle was adjusted to 15 degrees, the drum collector was adjusted to 1000rpm and drum collector- syringe distance is at 15 cm and 23 gauge. Device Fabrication- The PET film was sputter coated with electrode (nickel) and the PVDF nanofiber film was cut and sandwiched between the PET.