6542
When an AFM tip scans over the nanorod in contact mode , the nanorod will be twisted by the comprehensive action from the force of the AFM tip , confinement from the trench edge and the fixing end .
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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