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Without silica nanoparticles , silver nanowires tend to aggregate , which is why additional silver nanowires are required for a desired electrical conductivity .
 Chemical: silica; Chemical: silver; Chemical: silver
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: silver; Chemical: silver