Lim, Hongjin 김영경 Kim, Hong-Sik Lee, Taegeon 엠디모니호센 정현오 Lee, Heon Sang 조현진 주용호 이상석 Park, Sungjune Rho, Heesuk 정현수 Kim, Myung Jong 안석훈 Moon, Se Youn Kim, Keun Su Choi, Siyoung Q. Kim, Bumjoon J. Jang, Se Gyu 2024-01-12T06:36:11Z 2024-01-12T06:36:11Z 2023-06-05 2023-05 1944-8244 https://pubs.kist.re.kr/handle/201004/79931 Microfiber fabrication via wet-spinning of lyotropic liquid crystals (LCs) with anisotropic nanomaterials has gained increased attention due to the microfibers’ excellent physical/chemical properties originating from the unidirectional alignment of anisotropic nanomaterials along the fiber axis with high packing density. For wet-spinning of the microfibers, however, preparing lyotropic LCs by achieving high colloidal stability of anisotropic nanomaterials, even at high concentrations, has been a critically unmet prerequisite, especially for recently emerging nanomaterials. Here, we propose a cationically charged polymeric stabilizer that can efficiently be adsorbed on the surface of boron nitride nanotubes (BNNTs), which provide steric hindrance in combination with Coulombic repulsion leading to high colloidal stability of BNNTs up to 22 wt %. The BNNT LCs prepared from the dispersions with various stabilizers were systematically compared using optical and rheological analysis to optimize the phase behavior and rheological properties for wet-spinning of the BNNT LCs. Systematic optical and mechanical characterizations of the BNNT microfibers with aligned BNNTs along the fiber axis revealed that properties of the microfibers, such as their tensile strength, packing density, and degree of BNNT alignment, were highly dependent on the quality of BNNT LCs directly related to the types of stabilizers. English American Chemical Society Lyotropic Boron Nitride Nanotube Liquid Crystals: Preparation, Characterization, and Wet-Spinning for Fabrication of Composite Fiber Article 10.1021/acsami.3c00189 1 ACS Applied Materials & Interfaces, v.15, no.20, pp.24681 - 24692 ACS Applied Materials & Interfaces 15 20 24681 24692 N scie scopus 000989142000001 Nanoscience & Nanotechnology Materials Science, Multidisciplinary Science & Technology - Other Topics Materials Science Article; Early Access CARBON NANOTUBES NONCOVALENT FUNCTIONALIZATION DISPERSION NANOPARTICLES PERCOLATION RHEOLOGY liquid crystal nanotube colloidal dispersion microfiber ceramic