Sentence:  Related to <WSD>micelle</WSD> formation is the technologically important ability of detergent actives to congregate at oil water interfaces in such a manner that the polar ( or ionized ) end of the molecule is directed towards the aqueous phase and the hydrocarbon chain towards the oily phase . 
Meaning of the word marked with <WSD> tags:  an electrically charged particle built up from polymeric molecules or ions and occurring in certain colloidal electrolytic solutions like soaps and detergents