12624
In this Article , we focus on the incorporation of RA , as a negatively charged moiety , into layered polyelectrolyte films on surfaces by means of layer - by - layer ( LbL ) deposition , followed by adding of capping layers to regulate the release of RA from the films .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None