Electrospinning technology is a method for preparing one-dimensional micro-nano fiber structural materials on a large scale and at low cost. The high molecular polymer fibers prepared by the electrospinning technology have wide applications in energy storage and storage, electronic devices, and biomedicine. The piezoelectric fiber prepared by electrospinning can be made into a flexible electronic component due to its excellent flexibility and stretchability, and is applied to a wearable device to detect the posture of the human body.
The Wei Lei group of the School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore, controlled the mechanical parallelism to control the parallelism of the randomly distributed electrospun (PVDF-TrFE) piezoelectric fibers and the highly parallel piezoelectric The mechanical and electrical properties of the fibers were studied in detail.
In the conventional electrospinning technique, if a highly parallel electrospun fiber is desired, it is usually necessary to use a collector that rotates at a very high speed or has a very narrow edge, which limits the yield of the electrospun product. By adjusting the technical parameters in the electrospinning process and controlling the volatilization rate of the organic solvent, the nascent fiber can contain a small amount of solvent, which greatly improves the plasticity of the nascent fiber. Through the precisely controlled mechanical stretching process, the parallelism of the electrospun fibers can be greatly improved to obtain more excellent mechanical and electrical properties.
Tests have shown that under the same fiber density and the same deformation, the electrical signal output of electrospun piezoelectric fibers with a parallelism of about 80% is 266% of the randomly distributed control group, and exhibits superior mechanical durability. . These highly parallel piezoelectric fibers are twisted into fiber bundles, which can be used independently or in combination to monitor the movement and posture of the human body, the bending angle of the upper limbs, and the direction of the swing arm during walking.
In addition, these fiber bundles can be further fabricated into fabrics, which are more widely used in wearable electronic equipment. For example, sensors based on highly parallel electrospun piezoelectric fibers can be used for motion tracking of virtual reality technology.
Researchers believe that this simple and convenient method of increasing the parallelism of electrospun fibers can greatly reduce the cost of obtaining parallel electrospun fibers and contribute positively to the scale and commercial application of electrospun fibers.
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