23349
Nearly uniform structures with well - defined diameters of 53 +/- 7 , 81 +/- 9 , 85 +/- 8 , and 166 +/- 13 nm were achieved by introducing uniform , in - plane curvature to the repeating units .
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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:
 None