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We have performed optical profilometry , scanning electron microscopy , and contact angle measurement study to investigate the difference between electropolishing and chemical polishing methods .
 process characterization: optical; process characterization: scanning electron microscopy; application: contact; process characterization: measurement; manufacturing process: electropolishing; manufacturing process: chemical polishing
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: optical, scanning electron microscopy, contact, measurement, electropolishing, chemical polishing 
Answer:
 process characterization: optical; process characterization: scanning electron microscopy; application: contact; process characterization: measurement; manufacturing process: electropolishing; manufacturing process: chemical polishing