These particles, however, have silicon on {TAIL ~ the surface}, which contributes to {HEAD ~ improved dispersibility} 
These particles , however , have silicon on { TAIL ~ the surface } , which contributes to { HEAD ~ improved dispersibility }
OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD