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Integration of biocompatible silica with a fluorescent polymer ( PDDF ) and superparamagnetic iron oxide nanoparticles ( Fe3 O4 ) to form uniform core - shell nanostructures has the great potential to form particles for use in multimodal bioimaging applications .
 Chemical: silica; Chemical: iron oxide; Chemical: Fe3 O4
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: iron oxide; Chemical: Fe3 O4