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IR and NMR spectroscopy were used to determine the silanol content in the most common mesoporous ordered silicas : MCM - 41 , MCM - 48 , SBA - 15 and SBA - 16 .
 Chemical: silanol; Chemical: silicas; Chemical: MCM - 41; Chemical: MCM - 48; Chemical: SBA - 15; Chemical: SBA - 16
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: silanol; Chemical: silicas; Chemical: MCM - 41; Chemical: MCM - 48; Chemical: SBA - 15; Chemical: SBA - 16