Structural control of mesoporous silicas with large nanopores in a mild buffer solution

	Structural control of mesoporous silicas with large nanopores in a mild buffer solution
	Liu, Jian 1,2; Zhang, Lei 1; Yang, Qihua 1; Li, Can 1
刊名	microporous and mesoporous materials
	2008-12-01
卷号	116 期号:1-3 页码:330-338
关键词	Mesoporous silicas Structure Buffer solution Vesicles
通讯作者	杨启华 ; 李灿
产权排序	1;1
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.
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
关键词[WOS]	surfactant assemblies ; templating approach ; copolymer ; triblock ; temperature ; vesicles ; organosilicas ; mechanism ; sba-15 ; foams
收录类别	SCI
原文出处	true
语种	英语
WOS记录号	WOS:000261133600046
公开日期	2010-11-30
内容类型	期刊论文
源URL	[http://159.226.238.44/handle/321008/100823]
专题	大连化学物理研究所_中国科学院大连化学物理研究所
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
推荐引用方式 GB/T 7714	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.
APA	Liu, Jian,Zhang, Lei,Yang, Qihua,&Li, Can.(2008).Structural control of mesoporous silicas with large nanopores in a mild buffer solution.microporous and mesoporous materials,116(1-3),330-338.
MLA	Liu, Jian,et al."Structural control of mesoporous silicas with large nanopores in a mild buffer solution".microporous and mesoporous materials 116.1-3(2008):330-338.