11560
A significant difference was found between the polished surface and that oxidized at pH 4 , with an increase in contact angle of about 13 degrees ( 46 degrees to 59 degrees ) after oxidation .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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