Simonsen Ginestra Cedric J, Martínez-Jiménez Cecilia, Matatyaho Ya'akobi Asia, Dewey Oliver S, Smith McWilliams Ashleigh D, Headrick Robert J, Acapulco Jesus A, Scammell Lyndsey R, Smith Michael W, Kosynkin Dmitry V, Marincel Daniel M, Park Cheol, Chu Sang-Hyon, Talmon Yeshayahu, Martí Angel A, Pasquali Matteo
Department of Chemical and Biomolecular Engineering, Rice University, 6100 Main Street, MS 369, Houston, TX, 77005, USA.
Department of Chemistry, Rice University, 6100 Main Street, MS 369, Houston, TX, 77005, USA.
Nat Commun. 2022 Jun 7;13(1):3136. doi: 10.1038/s41467-022-30378-5.
Boron nitride nanotubes (BNNTs) have attracted attention for their predicted extraordinary properties; yet, challenges in synthesis and processing have stifled progress on macroscopic materials. Recent advances have led to the production of highly pure BNNTs. Here we report that neat BNNTs dissolve in chlorosulfonic acid (CSA) and form birefringent liquid crystal domains at concentrations above 170 ppmw. These tactoidal domains merge into millimeter-sized regions upon light sonication in capillaries. Cryogenic electron microscopy directly shows nematic alignment of BNNTs in solution. BNNT liquid crystals can be processed into aligned films and extruded into neat BNNT fibers. This study of nematic liquid crystals of BNNTs demonstrates their ability to form macroscopic materials to be used in high-performance applications.
氮化硼纳米管（BNNTs）因其预测的非凡特性而备受关注；然而，合成和加工方面的挑战阻碍了宏观材料的进展。最近的进展已实现了高纯度BNNTs的生产。在此我们报告，纯BNNTs可溶解于氯磺酸（CSA）中，并在浓度高于170 ppmw时形成双折射液晶域。这些触变域在毛细管中经光声处理后合并成毫米级区域。低温电子显微镜直接显示了溶液中BNNTs的向列排列。BNNT液晶可加工成取向膜并挤出成纯BNNT纤维。这项对BNNTs向列液晶的研究证明了它们形成可用于高性能应用的宏观材料的能力。
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