26785
The PDMS surfaces were characterized by fluorescent measurement , water and DEX contact angle measurements , and X - ray photoelectron spectroscopy ( XPS ) analysis to confirm surface properties .
 Chemical: PDMS
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: PDMS