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By Ying Chen, (Professor)

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Extra info for Nanotubes and nanosheets : functionalization and applications of boron nitride and other nanomaterials

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Li, L. et al. “Chemical blowing” of thin-walled bubbles: High-throughput fabrication of large-area, few-layered BN and CX-BN nanosheets. Advanced Materials 23(35) (2011b): 4072–4076. , and Chen, Y. Template-directed synthesis of boron nitride nanotube arrays by microwave plasma chemical reaction. Electrochimica Acta 52(8) (2007): 2841–2844. , and Yin, J. Boron nitride nanosheets: Large-scale exfoliation in methanesulfonic acid and their composites with polybenzimidazole. Journal of Materials Chemistry 21(30) (2011c): 11371–11377.

Theoretical calculations and experimental results based on high-resolution TEM (HRTEM) investigations of different BN nanomorphologies are presented. For clarification, some structural features of BN nanotubes and nanosheets are compared with those of C nanotubes and graphenes. 1 Atomic Structure of BN Nanotubes BN nanotubes can be defined as cylinders of concentric h-BN layers (from one to many layers), with diameters in the nanometer scale. The structure of multiwalled BN tubes can be described by two different models.

But when the cross section is circular, it is not possible to maintain a coherent interface without an excessive amount of tensile strain, due to the difference in the circumference of consecutive shells. When the interface is coherent, the same number of unit cells has to be spread out over a length that increases with distance from the center of the nanotube. This is unlikely for multiwalled nanotubes due to the large amount of strain required (Tibbetts et al. 2009). 16 is a schematic of two layers of BN in two different conditions.

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