The molecular weights of {HEAD ~ the nonionic surfactant} are preferably in {TAIL ~ the range} from 500 to 3000 g/mol 
The molecular weights of { HEAD ~ the nonionic surfactant } are preferably in { TAIL ~ the range } from 500 to 3000 g / mol
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH