18164
Structural investigations and comparisons with mechanical behavior of annealed nanofibers allowed us to attribute ultrahigh ductility ( average failure strain stayed over 50 % ) and toughness to low nanofiber crystallinity resulting from rapid solidification of ultrafine electrospun jets .
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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