Measuring tensile strength of nanofibers using conductive substrates and dynamic mechanical analyzer |
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Authors: | Kenny Yoonki Hwang Woong-Ryeol Yu |
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Institution: | (1) Department of Mechanical and Aerospace Engineering, Case Western Reserve University, Cleveland, OH 44106-7222, USA |
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Abstract: | Though the tensile strength of nanofibers is essential to determine their application fields, few studies have been conducted
on this topic, due to the difficulties involved in the preparation of single nanofiber tensile specimens, the manipulation
of the clamping device, and the sensing of the nano- force and strain. A bundle testing method was employed in this work to
measure the tensile strength of nanofibers. For this purpose, a conductive substrate was designed to hold several thousand
nanofibers extruded from a spinning nozzle and align them uniaxially during the electrospinning process. This substrate was
designed for a dynamic mechanical analyzer (DMA), because most DMAs are equipped with fine sensors sensitive enough to measure
a very small force and strain. Nylon 6 nanofibers were electrospun and collected on the substrate. Then, they were elongated
simultaneously in the DMA until they were fractured, showing that the aligned nanofibers have superior tensile strength and
modulus compared to their counterpart microfibers and thus suggesting that polymeric nanofibers have the potential to be used
as reinforcement fibers for composite materials. |
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Keywords: | |
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