| 초록 |
Boron nitride nanotubes (BNNTs) have been considered as an emerging nanomaterial owing to their superb physical properties such as high specific mechanical strength, high thermal conductivity, high oxidation resistance (stable up to 900℃), piezoelectric, and high neutron absorptivity. However, the high concentration BNNT dispersion, which should be achieved to maximize the advantages of BNNTs in composite applications, has still been a challenging issue. In this talk, we will present a non-covalent functionalization approach in order to efficiently disperse BNNTs in water. Interestingly, a lyotropic BNNT liquid crystal (LC) was observed at a critical concentration of BNNTs. The BNNT LCs were characterized by polarized optical microscopy (POM) and their rheological properties were investigated systematically. Finally, by wet-spinning of the BNNT LCs, a BNNT/polymer composite fiber composed of unidirectionally aligned BNNTs inside the fiber was fabricated. |
