Sentence:  Related to micelle formation is the technologically important ability of <WSD>detergent</WSD> 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:  a surface-active chemical widely used in industry and laundering