It is believed that {HEAD ~ the nano ZnO particles} are interacting with {TAIL ~ the TiO2} to form a more efficient dispersion 
are interacting with
It is believed that { HEAD ~ the nano ZnO particles } are interacting with { TAIL ~ the TiO2 } to form a more efficient dispersion
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH