17525
The two competing effects give rise to a higher adhesion force of mfp - 3 on the TiO2 surface at pH 7 . 5 than at pH 5 . 5 .
 Chemical: TiO2
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: TiO2