It is believed that the nanoparticle sized {HEAD ~ extender pigment particles}, for example illustrated as ZnO, have {TAIL ~ an affinity} for the surface of TiO2 particles that aides in spacing the TiO2 particles 
It is believed that the nanoparticle sized { HEAD ~ extender pigment particles } , for example illustrated as ZnO , have { TAIL ~ an affinity } for the surface of TiO2 particles that aides in spacing the TiO2 particles
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH