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8. Polymer Nanocomposite Sensors with Improved Piezoelectric Properties through Additive Manufacturing.

Author

Srinivasaraghavan Govindarajan, Rishikesh, Ren, Zefu, Melendez, Isabel, Boetcher, Sandra K. S., Madiyar, Foram, and Kim, Daewon

Subjects
*POLYVINYLIDENE fluoride, *PIEZOELECTRIC detectors, *NANOCOMPOSITE materials, *LIQUID crystal displays, *PIEZOELECTRIC materials, *POLYMERS, *THREE-dimensional printing, *ULTRAVIOLET lasers
Abstract

Additive manufacturing (AM) technology has recently seen increased utilization due to its versatility in using functional materials, offering a new pathway for next-generation conformal electronics in the smart sensor field. However, the limited availability of polymer-based ultraviolet (UV)-curable materials with enhanced piezoelectric properties necessitates the development of a tailorable process suitable for 3D printing. This paper investigates the structural, thermal, rheological, mechanical, and piezoelectric properties of a newly developed sensor resin material. The polymer resin is based on polyvinylidene fluoride (PVDF) as a matrix, mixed with constituents enabling UV curability, and boron nitride nanotubes (BNNTs) are added to form a nanocomposite resin. The results demonstrate the successful micro-scale printability of the developed polymer and nanocomposite resins using a liquid crystal display (LCD)-based 3D printer. Additionally, incorporating BNNTs into the polymer matrix enhanced the piezoelectric properties, with an increase in the voltage response by up to 50.13%. This work provides new insights for the development of 3D printable flexible sensor devices and energy harvesting systems. [ABSTRACT FROM AUTHOR]

Published
2024
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12. Flexible Mold for Microstructures Replication

Author

Ren, Zefu, Kim, Dae Won, Ren, Zefu, and Kim, Dae Won

Abstract

Space debris has been a growing concern in space exploration sector. To combat this issue, biomimicry is utilized to create a gecko’s feet microstructure that will be attached to a gripper or robotic arm. This will enable capture of debris through the use of dry adhesive microstructure. However, the production of such microstructures is expensive which hinders their implementation. The objective of this research is to develop an advanced fabrication process to mass produce gecko’s feet microstructure with soft polymer mold. The possibility of using different coating methods with coating materials will be justified. The process of fabricating mold and replicating mold will be optimized. The method of mass producing microstructures will be verified and the limitation of the method will also be studied.

Published
2021

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