28815
All the results prove that the sol - gel coassembly method with two substrates confinement is a simple , low cost , convenient and versatile method for the fabrication of silica inverse opals without overlayers in large domains .
 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: silica