High-surface area spherical micro-mesoporous silica particles

摘要: Abstract Submicrometer spherical micro-mesoporous SiO 2 particles have been synthesized with a Brunauer–Emmett–Teller specific surface area of up to 1600 m  g −1 , comparable that nanoporous carbon materials. The are constituted by densely packed channels, similarly materials the MCM-41 type. two pore subsystems: monodisperse cylindrical mesopores controllably varied average diameter (2.5–3.5 nm) and micropores supposedly situated within walls channels between their outer surfaces. combined structure obtained hydrolysis mixture tetraethoxysilane (TEOS) [3-(methacryloyloxy)propyl]trimethoxysilane (MPTMOS) molar ratio 5:1 in an alcoholic–aqueous–ammonia medium containing surfactant (cetyltrimethylammonium bromide + 1,3,5-trimethylbenzene). Negatively charged products silica precursors (TEOS MPTMOS) condensed near positively amino groups on micelles forming layer hydrophilic methacryloyloxypropyl (MP) interior. Due Van der Waals forces, these coated organized into surfactant–silica clusters identical aggregates. Removing MP leads formation consequently.