8233
Furthermore , the helicity angle and radius of the formed helices are investigated by the lateral etching behavior and Cosserat curve theory of the Si ( 111 ) substrates , respectively , which are consistent with the experimental data .
 Chemical: Si
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: Si