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For example , our results show that the self - diffusion coefficient is not a monotonic function of the system composition , caused by the complex relation between hydrodynamic interactions and effective nanoparticle - nanoparticle interactions .
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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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