24780
PAMAM dendrimers of both generations adsorb to hydrophilic silica as a compact monolayer , and the adsorption is irreversible upon rinsing with salt solution .
 Chemical: PAMAM; Chemical: silica
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: PAMAM; Chemical: silica