1649
Hence , incorporation of IF-WS2 nanoparticles into PEEK via melt compounding is an effective approach for the development of suitable high-performance engineering materials for FFF .
 concept or principle: nanoparticles; material: PEEK; concept or principle: melt; material: engineering materials; manufacturing process: FFF
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: 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} 
 Entities: nanoparticles, PEEK, melt, engineering materials, FFF 
Answer:
 concept or principle: nanoparticles; material: PEEK; concept or principle: melt; material: engineering materials; manufacturing process: FFF