14672
For three types of colloidal magnetic nanocrystals , we demonstrate that postsynthetic cation exchange enables tuning of the nanocrystal ' s magnetic properties and achieving characteristics not obtainable by conventional synthetic routes .
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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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