28456
A poly [ 2 - ( diethylamino ) ethyl methacrylate ] brush was grown on a large silicon crystal which acted as both a substrate for a neutron reflectivity solid / liquid experiment but also as an FTIR - ATR spectroscopy crystal .
 Chemical: poly [ 2 - ( diethylamino ) ethyl methacrylate ]; Chemical: silicon
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: poly [ 2 - ( diethylamino ) ethyl methacrylate ]; Chemical: silicon