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The reduction of nitrogen-doped multiwalled carbon nanotubes (N-MWCNTs) with Li/NH 3 results in deep longitudinal cuts in the nanotubes structure. As the N-MWCNTs are anisotropic, we were able to investigate whether the unzipping process proceeds with equal efficiency from the tip end or from the root (catalyst) end of the N-MWCNT structure. To accomplish this we prepared polymerfilled aligned arrays of N-MWCNTs, then exposed one or the other end. Through this approach we were able to shielddoi:10.1088/2053-1591/1/1/015603 fatcat:ar6dtbyq2vfndbluyjor5a52pi