Thus, the nanoparticles and TiO2 interact by a mechanism resulting in {HEAD ~ improved spacing} of {TAIL ~ the TiO2 particles} 
of
Thus , the nanoparticles and TiO2 interact by a mechanism resulting in { HEAD ~ improved spacing } of { TAIL ~ the TiO2 particles }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL