期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 135, 期 7, 页码 2427-2430出版社
AMER CHEMICAL SOC
DOI: 10.1021/ja3116873
关键词
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资金
- NSFC [21003050, 20925310, U1162102, 61008003]
- STCSM [10ZR1410500, 08DZ2273300, 11QA1402100]
- Ph.D. Programs Foundation of the Ministry of Education of China [20100076120019]
- National Key Technology RD Program [2012BAE05B02]
- innovation Program of Shanghai Municipal Education Commission [13ZZ038]
- Fundamental Research Funds for the Central Universities
- Joint Research Institute for Science and Society (JoRISS) of ECNU
- Joint Research Institute for Science and Society (JoRISS) of ENS de Lyon
- Joint Research Institute for Science and Society (JoRISS) of CNRS
Mesoporous silica nanoparticles (MSNs) are experiencing rapid development in the biomedical field for imaging and for use in heterogeneous catalysis. Although the synthesis of MSNs with various morphologies and particle sizes has been reported, synthesis of a pore network with monodispersion control below 200 nm is still challenging. We achieved this goal using mild conditions. The reaction occurred at atmospheric pressure with a templating sol-gel technique using cetyltrimethylammonium (CTA(+)) as the templating surfactant and small organic amines (SOAs) as the mineralizing agent. Production of small pore sizes was performed for the first time, using pure and redispersible monodispersed porous nanophases with either stellate (ST) or raspberry-like (RB) channel morphologies. Tosylate (Tos(-)) counterions favored ST and bromide (Br-) RB morphologies at ultralow SOA concentrations. Both anions yielded a worm-like (WO) morphology at high SOA concentrations. A three-step formation mechanism based on self-assembly and ion competition at the electrical palisade of micelles is proposed. Facile recovery and redispersion using specific SOAs allowed a high yield production at the kilogram scale. This novel technique has practical applications in industry.
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