This means that the nanoparticles replace a certain percentage of the microparticles, which causes {HEAD ~ a reduction} of {TAIL ~ the viscosity}  
of
This means that the nanoparticles replace a certain percentage of the microparticles , which causes { HEAD ~ a reduction } of { TAIL ~ the viscosity }
OTH OTH OTH 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 OTH