Investigation on Rheological Properties of Boron Nitride Nanotube Liquid Crystals
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Fiber fabrication by wet-spinning of carbon nanotubes-liquid crystal (CNT-LC) has been drawing attention due to superior properties. Meanwhile, the wet-spinning of boron nitride nanotubes (BNNTs) with high oxidation resistance, high specific mechanical strength, high thermal conductivity, piezoelectric, and high neutron shielding, a structural analogue of CNTs, has been remained as a challenging goal due to difficulty in achieving stable dispersion of BNNTs at high concentration enough to form lyotropic LC. In this study, we report a dispersing stabilizer for BNNTs providing an excellent stability in aqueous solution even at high concentration over 20 wt% of BNNTs. BNNT-LC observed by polarized optical microscopy were analyzed systematically. Furthermore, the rheological properties and the microfluidic properties of the BNNT-dopes were investigated to obtain the information on phase transition concentration into nematic phase for better understanding on wet-spinning of BNNT fibers.