Anionic liposome template synthesis of raspberry-like hollow silica particle under ambient conditions with basic catalyst

作者：Ishii Haruyuki; Sato Kumi; Nagao Daisuke; Konno Mikio^*

来源：Colloids and Surfaces B: Biointerfaces , 2012, 92: 372-376.

DOI：10.1016/j.colsurfb.2011.11.005

• Raspberry-like hollow silica particle
• Anionic liposome
• Vesicle template synthesis
• Basic catalyst

Hollow silica particle was obtained with a vesicle template synthesis in water under ambient conditions in the presence of ammonia. Biomimetic vesicles, liposomes were used, which consisted of a zwitteri-onic phospholipid, 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC), and a tiny amount of charged amphiphiles. hexadecylamine (HDA) or dicetylphosphate (DCP). Aggregation of silica occurred for DPPC or cationic DPPC/HDA liposome, whereas well-dispersed hollow silica particle could be obtained for anionic DPPC/DCP liposome. The hollow particle synthesized with the anionic liposome had single-layered and raspberry-like structures. Electrostatic repulsion between anionic vesicles maintained stable dispersion of the as-synthesized particles during the reaction. Formation of the raspberry-like morphology is explained by silica particle precipitation selectively induced around the liposomes under basic conditions due to affinity of silica precursors for the liposomes. Synthesis of well-dispersed hollow silica particle with a raspberry-like morphology is the first report in vesicle template syntheses.

• 出版日期2012-4-1