The step of improving the dispersion of {TAIL ~ the particles} in {HEAD ~ the washed suspension} may be carried out by sonication 
The step of improving the dispersion of { TAIL ~ the particles } in { HEAD ~ the washed suspension } may be carried out by sonication
OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH