16683
ATR - FTIR spectroscopy , polarised light microscopy ( PLM ) , scanning electron microscopy ( SEM ) and nano - thermal analysis ( nano - TA ) were performed on the model systems after storage under saturated humidity .
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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:
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