17040
Polymer / silica composite films , stable to calcination , were produced using catanionic surfactant mixtures ( hexadecyltrimethylammonium bromide ( CTAB ) and sodium dodecyl sulfate ( SDS ) ) and polymers ( polyethylenimine ( PEI ) or polyacrylamide ( PAAm ) ) at the air / water interface .
 Chemical: silica; Chemical: hexadecyltrimethylammonium bromide; Chemical: CTAB; Chemical: sodium dodecyl sulfate; Chemical: SDS; Chemical: polyethylenimine; Chemical: PEI; Chemical: polyacrylamide; Chemical: PAAm
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: silica; Chemical: hexadecyltrimethylammonium bromide; Chemical: CTAB; Chemical: sodium dodecyl sulfate; Chemical: SDS; Chemical: polyethylenimine; Chemical: PEI; Chemical: polyacrylamide; Chemical: PAAm