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Utilizing a bimodal grafted polymer brush design , with densely grafted short brushes to shield particle surfaces and sparsely grafted long brushes that favor the entanglement with matrix chains , we dispersed TiO ( 2 ) nanoparticles in high molecular weight commercial silicone matrices and successfully prepared thick ( about 5 mm ) transparent high - refractive - index TiO ( 2 ) / silicone nanocomposites .
 Chemical: TiO ( 2 ); Chemical: silicone; Chemical: TiO ( 2 ); Chemical: silicone
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: TiO ( 2 ); Chemical: silicone; Chemical: TiO ( 2 ); Chemical: silicone