25609
The deduced role of surface hydration is corroborated by hydration repulsion observed at high pH , surface over - charging at low pH , and data in other oxides .
 Chemical: oxides
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: oxides