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1. 

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   waseem mohammedabdul @ 5:09 am on 20 May 2010

   Nanostructures formed in a layered boron nitride eg:nanotubes are structural analogs to those in carbon ,alternating Boron and Nitride atoms readily substitute for for C atoms in a graphite sheets.They have completely different bonding character,structural defects and physical and chemical properties.A Boron Nitride Nanotubes are considered to be insulating independent of their atomic structure.Thermally and chemically it is more stable and can be of prime importance to real applications. It is an analog to graphene,can be formed in a two-dimensional honeycomb lattice with the in-equivalent sublattice sites occupied by Boron(III)and Nitride(V)The chirality of BN nano tube depends on rolling of the BN sheet which results in armchair,zigzag,and chiral BN nanotube sturctures .BN nanotubes are pyroelectric,piezoelectric and photogalvanic in nature. Still the research is being carried out owing to the physical properties which are quiet distinct form those of CNTs.

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   Bagavathi Shivakumar @ 11:37 pm on 22 Jan 2012

   Boron Nitride was the first chemical compound to replace elemental carbon in nanotubes because of its hexagonal structure which is similar to graphite. Boron nitride (BN) crystallizes in a graphite-like structure and can be simply viewed as replacing a Carbon–Carbon pair in the graphene sheet with the iso-electronic Boron–Nitrogen pair. Replacement of the Carbon–Carbon pairs entirely by the Boron–Nitrogen pairs in the hexagonal network of graphite leads to the formation of a wide array of two-dimensional phases that can form hollow cage structures and nanotubes. The possibility of replacing Carbon–Carbon pairs by B–N pairs in the hollow cage structure of C60 was predicted and verified experimentally. Pure BN nanotubes have been generated by employing several procedures, yielding nanotubes with varying wall thickness and morphology. They exist in zigzag, chiral and armchair forms. It is therefore quite possible that nanotube structures of other layered materials can be prepared as well. For example, many metal halides (e.g., NiCl2), oxides (GeO2) and nitrides (GaN) crystallize in layered structures.

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