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We find that one may increase the electrical conductivity of silver nanowire / polymer nanocomposites by up to about 8 orders of magnitude by introducing silica nanoparticles with nanocomposites .
 Chemical: silver; 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: silver; Chemical: silica