Thus, the nanoscale particles may comprise {HEAD ~ a metal} or {TAIL ~ a metal oxide} such as iron oxide 
Thus , the nanoscale particles may comprise { HEAD ~ a metal } or { TAIL ~ a metal oxide } such as iron oxide
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH