26096
The contact angle theta of the particles at the planar oil - water interface has been measured directly using freeze - fracture shadow - casting cryo - scanning electron microscopy , enabling single - particle measurements of high accuracy .
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Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities:  
Answer:
 None