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In this paper, we adopt a facile method to prepare a new type of hollow silica spheres with thiol functional groups. Thiol-functionalized silica shells were coated on positively charged polystyrene particles by hydrolysis and condensation of 3-mercaptopropyltriethoxysilane (MPTS); the polystyrene cores were dissolved in the same medium to form monodispersed thiol-functionalized hollow silica spheres. Neither additional dissolution nor a calcination process was needed to remove the polystyrene cores. Transmission electron microscopy, scanning electron microscopy, and Fourier transform infrared analysis and porosity measurements were used to characterize the monodispersed thiol-functionalized hollow silica spheres.
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Yuan et al. (2008) studied this question.
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