14584
SiO2 @ Au core - shell nanospheres self - assemble to form colloidal crystals that can be sintered and surface modified to produce pH - controlled membranes .
 Chemical: SiO2; Chemical: Au
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: SiO2; Chemical: Au