Heo, So Jeong Kim, Junghwan Choi, Gyeong Min Lee, Dongju Im, Byeong Woo Kim, Sung-Soo Ku, Bon-Cheol Lee, Heon Sang Kim, Seo Gyun 2024-06-13T02:00:36Z 2024-06-13T02:00:36Z 2024-06-13 2024-06 0008-6223 https://pubs.kist.re.kr/handle/201004/150064 In this study, we investigate structural change in wet -spun carbon nanotube (CNT) fibers and explore the resulting changes in density and tensile strength. Given the presence of chlorosulfonic acid (CSA) inside the fiber and the evolution of tubular shape, the difference between the experimental density of CNT fibers and the theoretical density of individual CNTs can be reasonably approximated. During the heat treatment of pristine CNT fibers at 1400 degrees C, the capillary force induced by removal of CSA between or inside CNTs leads to the polygonization of the circumference of individual nanotubes. This morphological transformation results in the improved tensile strength and increased density by enlarging the contact area between CNTs and reducing the occupied volume. The demonstration of correlation between CNT structure and density can offer insights into the manufacturing and applications of high-performance CNT fibers. English Pergamon Press Ltd. Microstructural evolution effects on the density of carbon nanotube fibers Article 10.1016/j.carbon.2024.119180 1 Carbon, v.226 Carbon 226 Y scie scopus 001237129700001 2-s2.0-85192017423 Chemistry, Physical Materials Science, Multidisciplinary Chemistry Materials Science Article MECHANICAL-PROPERTIES Carbon nanotube fibers Density Wet-spinning Tensile strength Elasto-capillary force