Ordered Mesoporous Silicas and Carbons with Large Accessible Pores Templated from Amphiphilic Diblock Copolymer Poly(ethylene oxide)-b-polystyrene
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- 作者：Yonghui Deng ; Ting Yu ; Ying Wan ; Yifeng Shi ; Yan Meng ; Dong Gu ; Lijuan Zhang ; Yan Huang ; Chong Liu ; Xiaojing Wu ; Dongyuan Zhao
- 刊名：Journal of the American Chemical Society
- 出版年：2007
- 出版时间：February 14, 2007
- 年：2007
- 卷：129
- 期：6
- 页码：1690 - 1697
- 全文大小：390K
- 年卷期：v.129,no.6(February 14, 2007)
- ISSN：1520-5126
文摘
Highly ordered mesoporous carbons and silicas with ultralarge accessible pores have beensuccessfully synthesized by using laboratory-made poly(ethylene oxide)-b-polystyrene (PEO-b-PS) diblockcopolymers as templates via the evaporation-induced self-assembly (EISA) approach. Resols and tetraethylorthosilicate (TEOS) serve as carbon and silica precursors, respectively. Small-angle X-ray scattering (SAXS)and transmission electron microscopy (TEM) measurements show that the mesoporous carbons (denotedas C-FDU-18) possess face centered cubic closed-packing (fcc) mesostructure (Fm
m) with large-domainordering. N2 sorption isotherms reveal a large mesopore at the mean value of 22.6 nm with a narrowpore-size distribution. Mesoporous silicas (Si-FDU-18) also display a highly ordered fcc closed-packingmesostructure with an ultralarge unit cell (a = 54.6 nm). A hydrothermal recrystallization was introducedfor the first time to produce micropores in thick silica walls (~7.7 nm) and thus to generate ultralargeaccessible mesopores (30.8 nm). Notably, the amphiphilic diblock copolymer with high molecular weight(PEO125-PS230, 29700 g mol-1) in this report was prepared via a simple method of atom transfer radicalpolymerization (ATRP). It can be easily available for chemists even without any experience in polymersynthesis.
m) with large-domainordering. N2 sorption isotherms reveal a large mesopore at the mean value of 22.6 nm with a narrowpore-size distribution. Mesoporous silicas (Si-FDU-18) also display a highly ordered fcc closed-packingmesostructure with an ultralarge unit cell (a = 54.6 nm). A hydrothermal recrystallization was introducedfor the first time to produce micropores in thick silica walls (~7.7 nm) and thus to generate ultralargeaccessible mesopores (30.8 nm). Notably, the amphiphilic diblock copolymer with high molecular weight(PEO125-PS230, 29700 g mol-1) in this report was prepared via a simple method of atom transfer radicalpolymerization (ATRP). It can be easily available for chemists even without any experience in polymersynthesis.