4587
The movement of individual block copolymer micelles in free - standing films of ionic liquids is investigated by transmission electron microscopy with the aim of providing an easily accessible high - resolution imaging tool for the in situ observation of particle movement in a liquid environment .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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