Sentence:  Obviously hydrophobic ( oleophilic ) substances such as greases , oils , or particles having a greasy or oily surface are more at home in the center of a micelle than in the aqueous <WSD>phase</WSD> . 
Meaning of the word marked with <WSD> tags:  (physical chemistry) a distinct state of matter in a system; matter that is identical in chemical composition and physical state and separated from other material by the phase boundary