Preferably {HEAD ~ the nanoscale particles} have {TAIL ~ an average particle size} of less than about 50 nm, more preferably less than about 10 nm 
have
Preferably { HEAD ~ the nanoscale particles } have { TAIL ~ an average particle size } of less than about 50 nm , more preferably less than about 10 nm
OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH