1. Researchers from Korea investigated the effects of microstructural evolution on the density of carbon nanotube (CNT) fibers, which is crucial for their mechanical properties and applications. 2. The study highlighted the impact of residual chlorosulfonic acid (CSA) on the density and mechanical properties of CNT fibers. 3. The findings suggest that understanding structural evolution is essential for optimizing the performance of CNT fibers in high-strength applications.

1. Researchers at Tokyo Institute of Technology identified that the poor mechanical performance of carbon nanotube (CNT) bundles and yarns is due to localized rearrangements of CNTs during twisting, leading to disclination lines. 2. These disclinations, formed by disrupted hexagonal patterns in CNT bundles, significantly reduce the tensile properties. 3. The study offers insights into improving CNT yarns' performance and could contribute to advancements in computational materials science.