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