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题名: Structural control of mesoporous silicas with large nanopores in a mild buffer solution
作者: Liu, Jian1, 2;  Zhang, Lei1;  Yang, Qihua1;  Li, Can1
通讯作者: 杨启华 ;  李灿
关键词: Mesoporous silicas ;  Structure ;  Buffer solution ;  Vesicles
刊名: MICROPOROUS AND MESOPOROUS MATERIALS
发表日期: 2008-12-01
DOI: 10.1016/j.micromeso.2008.04.030
卷: 116, 期:1-3, 页:330-338
收录类别: SCI
文章类型: Article
部门归属: 5
项目归属: 506
产权排名: 1;1
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Applied ;  Chemistry, Physical ;  Nanoscience & Nanotechnology ;  Materials Science, Multidisciplinary
研究领域[WOS]: Chemistry ;  Science & Technology - Other Topics ;  Materials Science
英文摘要: In this study, a simple synthesis strategy has been developed for the systematic control of the structure and pore size of the mesoporous silicas through adjusting the ratio of tetraethoxysilane (TEOS) to tetramethoxysilane (TMOS) in a mild acidic buffer solution (acetic acid-sodium acetate pH 4.4) or the pH value using poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) (EO(20)PO(70)EO(20)) as a structure-directing agent. By varying the molar ratio of TEOS to TMOS, mesoporous silicas with 2-D hexagonal (p6mm) pore arrangement, onion-like lamellar structure, mixed phase (vesicular hierarchical structure and cellular foam), and nanofoams with large uniform spherical cells can be obtained. Simultaneously, the pore diameter can be varied in the range of 9-50 nm. The differences in the hydrolysis and polymerization rates between TEOS and TMOS were found to play a key role in the phase transformation of the final products. When TEOS was employed as the only silica precursor, the mesostructure and pore diameter of the resultant materials could be controlled through either varying the solution pH or the addition of fluoride ion to the synthesis system. Increasing the solution pH values from 3.2 to 5.1 induces the structure transformation from uniform wormhole mesostructure to nanofoams with large uniform spherical cells, then to aggregated and collapsed vesicle-like nanofoam structure accompanied by the increase of pore diameter from 7 to 50 nm. By addition of the fluoride ion, uniform macroporous nanofoam structure (ca. 100 nm in diameter) similar to the cell wall of diatoms was obtained. (C) 2008 Elsevier Inc. All rights reserved.
关键词[WOS]: SURFACTANT ASSEMBLIES ;  TEMPLATING APPROACH ;  COPOLYMER ;  TRIBLOCK ;  TEMPERATURE ;  VESICLES ;  ORGANOSILICAS ;  MECHANISM ;  SBA-15 ;  FOAMS
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000261133600046
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/100823
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China
2.Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China

Recommended Citation:
Liu, Jian,Zhang, Lei,Yang, Qihua,et al. Structural control of mesoporous silicas with large nanopores in a mild buffer solution[J]. MICROPOROUS AND MESOPOROUS MATERIALS,2008,116(1-3):330-338.
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