14853
A combinatorial materials chemistry approach , which employed Ca ( 2 + ) - mediated adsorption of anionic acrylic acid - containing sulfonated polymers to preformed citrate - stabilized IO nanoclusters , enabled the investigation of a large number of polymer coatings .
 Chemical: Ca ( 2 + ); Chemical: acrylic acid; Chemical: citrate
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: Ca ( 2 + ), acrylic acid, citrate 
Answer:
 Chemical: Ca ( 2 + ); Chemical: acrylic acid; Chemical: citrate