Preparation of SiO2/TiO2 Janus particles by electrostatic assembly, hydrolysis and calcination

Baoliang Zhang, Qiuyu Zhang, Hepeng Zhang, Xinlong Fan, Dezhong Yin, Xiangjie Li, Wei Li

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

This paper describes a novel chemical method for preparing SiO 2/TiO2 Janus particles. First, polystyrene (PSt)/SiO 2 particles with a raspberry-like structure are prepared by electrostatic assembly. The influences of the reaction time of sulfonation and the treatment times of polyelectrolyte solutions (PDADMAC, PSS) on PSt and SiO2 are investigated with respect to the surface charge density of the particles. SiO2/TiO2 Janus particles are then obtained by hydrolysis of butyl titanate on the surface of PSt/SiO2 particles followed by a calcination process. Particle size analyzer, Zeta potential instrument, FTIR, TEM and SEM are used to characterize the particle size, the amount of charge on the surface of PSt and SiO2 particles and the compositions and morphologies of PSt/SiO2, SiO2/TiO 2 and PSt/SiO2/TiO2. The diameters of the PSt, SiO2, PSt/SiO2 and SiO2/TiO2 particles are 2.0 μm, 303 nm, 2.7 μm and 330 nm, respectively.

Original languageEnglish
Pages (from-to)574-580
Number of pages7
JournalParticuology
Volume11
Issue number5
DOIs
StatePublished - Oct 2013

Keywords

  • Calcination
  • Electrostatic assembly
  • Hydrolysis
  • Janus particles

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