15871
The negative charge on the surface increased in the order of 2HTO , 3HTO , and 1HTO , whereas the surface area increased in the order of 3HTO , 1HTO , and 2HTO .
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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:
 None