Spherical Pseudo-Inverse Opal Silica with Pomegranate-Like Polymer Microparticles as Templates

초록

Spherical silica particles with pseudo-inverse opal structure are synthesized by using pomegranate-like polymer microparticles as templates. A micro-dispersion polymerization occurring in the suspended monomer droplets in the presence of a silica precursor leads to the formation of nearly monodisperse polymer sub-particles of about 1?mu m size, randomly-packed within a 30100?mu m polymer particle. The polymerization is followed by an acid-catalyzed reaction that induces formation of silica in the interstices between the sub-particles within a polymer particle. Spherical PIOS particles are eventually produced by selectively removing the polymer template by pyrolysis. The PIOS particles show large specific surface areas with unique pore geometry and pore size distribution.

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