journal article·2023-05-24

Lyotropic Boron Nitride Nanotube Liquid Crystals: Preparation, Characterization, and Wet-Spinning for Fabrication of Composite Fiber

Hongjin Lim, Young-Kyeong Kim, Hong-Sik Kim, Taegeon Lee, Md Monir Hossain, Hyun-Oh Jeong, Heon Sang Lee, Hyunjin Cho, Yongho Joo, Sang Seok Lee, Sungjune Park, Heesuk Rho, Hyeon Su Jeong, Myung Jong Kim, Seokhoon Ahn, Se Youn Moon, Keun Su Kim, Siyoung Q. Choi, Bumjoon J. Kim, Se Gyu Jang

ACS Applied Materials & Interfaces· Volume 15· Issue 20
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Abstract

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.
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Research context

OpenAlex topics: Diamond and Carbon-based Materials Research · Carbon Nanotubes in Composites · Advanced Materials and Mechanics

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Functional Composite Materials Research Center, Institute of Advanced Composites Materials, Korea Institute of Science and Technology, Wanju, Jeonbuk 55324, Republic of Korea

Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea

School of Chemical Engineering, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju 61186, Republic of Korea

Department of Physics, Research Institute of Physics and Chemistry, Jeonbuk National University, Jeonju 54896, Republic of Korea

Department of Chemistry, Department of Bioactive Materials Sciences, and Research Institute of Physics and Chemistry, Jeonbuk National University, Jeonju, Jeonbuk 54896, Republic of Korea

Department of Chemical Engineering, Dong-A University, Busan 49315, Republic of Korea

Department of Polymer-Nano Science and Technology, Department of Nano Convergence Engineering, Jeonbuk National University, Jeonju 54896, Republic of Korea

Department of Chemistry, Gachon University, 1342 Seongnam-daero, Sujeong-gu, Seongnam-si, Gyeonggi-do 13120, Republic of Korea

Department of Quantum System Engineering, Jeonbuk National University, 567, Baekje-daero, Deokjin-gu, Jeonju-si, Jeollabuk-do 54896, Republic of Korea

High-Enthalpy Plasma Research Center, Jeonbuk National University, 546 Bongdong-ro, Bongdong-eup, Wanju-gun, Jeollabuk-do 55317, Republic of Korea

Security and Disruptive Technologies Research Centre, Emerging Technologies Division, National Research Council Canada, Ottawa, Ontario K1A 0R6, Canada

KAIST Institute for the NanoCentury, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea

Funding

National Research Foundation of Korea · Ministry of Trade, Industry and Energy · Korea Institute of Science and Technology · Korea Research Institute for Defense Technology Planning and Advancement

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