Multi-step Coating of Monodisperse Silica Spheres by Titania Nanoparticles Base on Electrostatic Attraction Strategy


Journal: Vol.7, No.4, autumn 2014 - Article 4   Pages :   Until 



Article Code:
PCCC-24-08-2013-251

Authors:
Maryam Khame Forosh: Iran University of Science and Technology - School of Metallurgy and Materials Engineering
Vahideh Tajer Kajinebaf: Takestan Branch, Islamic Azad University - Department of Materials Engineering
Hossein Sarpoolaky: Iran University of Science and Technology - School of Metallurgy and Materials Engineering


Article's abstract:

TiO2-SiO2 core-shell particles include of monodisperse silica core and nanostructured titania shell were synthesized by a multi-step coating process. The monodisperse silica spheres were synthesized by Stöber method and titania shell was obtained of a colloidal sol prepared by a hydrolysis–condensation reaction. The titania sol was deposited on monodisperse silica spheres by a multi-step coating method based on electrostatic attraction. Characterization was performed by DLS, SEM, DTA-TG, FT-IR and XRD. Also, the activity of the core-shell particles was evaluated using methyl orange photodegradation by UV–visible spectrophotometer. The mean particle size of the colloidal titania sol was determined about 20 nm. The particle size of TiO2-SiO2 core-shell was about 500 nm. The deposit of titania nanoparticles on silica spheres was caused to delay anatase-rutile transformation. The core-shell particles calcined at 650 °C showed a much higher photocatalytic activity than pure titania.


Keywords:
Titania nanoparticle, Silica microsphere, Core-shell, Multi-step coating, Stöber method

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