In particular, embodiments of the invention relate to directing {TAIL ~ growth} of {HEAD ~ carbon nanotubes} 
In particular , embodiments of the invention relate to directing { TAIL ~ growth } of { HEAD ~ carbon nanotubes }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD