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One - pot , exchange - free , room - temperature synthesis of sub - 10 nm aqueous , noninteracting , and stable zwitterated iron oxide nanoparticles .
 Chemical: zwitterated iron oxide
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: zwitterated iron oxide