US Patent 7521225 Nanotube structures having a surfactant bilayer inner wall coating

Nanotubes and nanotube array structures comprise (a) a nanotube having an inner wall portion; and (b) a bilayer coating formed on the inner wall portions, with the bilayer coating comprised of surfactants. A secondary compound such as a protein, peptide or nucleic acid may be associated with the bilayer coating. The structures are useful for, among other things, affinity purification, catalysis, and as biochips.