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