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