1385
The results show that the surface tension of the binder decreases with the increasing of ZBC contents , indicating that the addition of ZBC particles perturbs the interaction between water molecules .
 surface tension, binder, particles
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:
 surface tension, binder, particles