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Titania coated silica nanoparticles were prepared through a sol-gel process using peptized TiO2 nano-sols. The TiO2 sols were obtained by peptization, the process of redispersing a coagulated colloid, and were coated on SiO2 particles by the control of the weight ratio of TiO2/SiO2 and the pH of the mixture in aqueous solution. At pH 4.5 the difference of zeta-potential between SiO2 and TiO2 maximized...