9569
Core - shell nanoparticles ( PDDF / Fe3 O4 @ SiO2 ) exhibit fluorescent and magnetic properties that are favorable for their use in magnetic separation and guiding applications , as well as optical and magnetic resonance ( MR ) imaging capabilities .
 Chemical: Fe3 O4; Chemical: SiO2
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: Fe3 O4; Chemical: SiO2