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SEM and EDX images of fractured surfaces indicate that a good dispersion of nanoparticles is achieved without any pre-treatment or pre-dispersion .
 process characterization: SEM; process characterization: EDX; concept or principle: surfaces; concept or principle: dispersion; concept or principle: nanoparticles
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: SEM, EDX, surfaces, dispersion, nanoparticles 
Answer:
 process characterization: SEM; process characterization: EDX; concept or principle: surfaces; concept or principle: dispersion; concept or principle: nanoparticles