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It was also shown that hydrothermal surface modification of MWCNTs with functional groups was achievable , which was a significant step toward eliminating nonwetting surface behavior of MWCNTs , resulting in obtaining homogeneous dispersion of them in liquids .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 None