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The hydrodynamic diameter of the particles was tuned by controlling the concentration of zwitterion siloxane , which ultimately yielded monodisperse nanoparticles small enough for renal filtration ( < 6 nm diameter ) .
 Chemical: zwitterion siloxane
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: zwitterion siloxane