29637
Poly ( ethylenimine ) ( PEI ) polyelectrolytes have been widely used to tune the stability , rheology , or adhesion properties of colloidal suspensions due to their strong tendency to adsorb to solid surfaces .
 Chemical: Poly ( ethylenimine ); Chemical: PEI
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
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Answer:
 Chemical: Poly ( ethylenimine ); Chemical: PEI