10522
A new class of hollow mesoporous Pt - Ru and Pt particles with uniform size , named ' mesoporous metallic cells ' , are synthesized through a dual - templating approach using colloidal silica particles and non - ionic surfactants .
 Chemical: Pt; Chemical: Ru; Chemical: Pt; Chemical: silica
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: Pt, Ru, Pt, silica 
Answer:
 Chemical: Pt; Chemical: Ru; Chemical: Pt; Chemical: silica