5006
The ink consists of iron oxide ( Fe3O4 ) nanoparticles ( nominal particle size 50–100 nm ) suspended within a UV curable matrix resin .
 ink, iron oxide, Fe3O4, nanoparticles, particle, UV, resin
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: manufacturing standard, machanical property, manufacturing process, material, engineering feature, process parameter, machine or equipment, application, process characterization, enabling technology, biomedical, concept or principle 
Text: {0} 
Answer:
 ink, iron oxide, Fe3O4, nanoparticles, particle, UV, resin