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In addition to disjoining pressure , the size of droplet and affinity of nanofluid for substrate were observed to have important influences on spreading of nanoparticles in triple region .
 concept or principle: pressure; concept or principle: droplet; material: substrate; 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: pressure, droplet, substrate, nanoparticles 
Answer:
 concept or principle: pressure; concept or principle: droplet; material: substrate; concept or principle: nanoparticles