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Recently , engineered nanoparticles ( NPs ) such as titanium ( TiO2 ) NPs have attracted much attention due to their wide range of applications .
 Chemical: titanium; 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: titanium; Chemical: TiO2