Synthesis and characterization of ordered, very large pore MSU-H silicas assembled from water-soluble silicates

被引:143
作者
Kim, SS
Karkamkar, A
Pinnavaia, TJ [1 ]
Kruk, M
Jaroniec, M
机构
[1] Michigan State Univ, Dept Chem, E Lansing, MI 48824 USA
[2] Michigan State Univ, Ctr Fundamental Mat Res, E Lansing, MI 48824 USA
关键词
D O I
10.1021/jp010773p
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Two-dimensional, hexagonally ordered silicas with large uniform mesopores (7.6-11.9 nm) have been assembled through a nonionic supramolecular assembly pathway using sodium silicate as a silica source and the triblock copolymer Pluronic P123 (EO20PO70EO20) as a structure-directing agent. An increase in the synthesis temperature from 308 to 333 K in a one-step procedure led to a systematic increase in the unit-cell size, pore diameter, specific surface area, and pore volume, and to a decrease in the pore wall thickness. The resulting materials exhibited adsorption properties highly similar to those of SBA-15 silica assembled through an electrostatic pathway under strongly acidic conditions, indicating that the framework structure of MSU-H is analogous to that of SBA-15 and consists of ordered large pores connected by micropores in the pore walls. When the one-step synthesis procedure was followed by a post-assembly hydrothermal treatment at 373 K, the resultant MSU-H silicas exhibited framework pores enlarged by 1.7-2.8 mn and substantially increased secondary (textural) porosity, a feature that is not characteristic of SBA-15. These results demonstrated a wide range of possibilities in tailoring the structures of silicas synthesized using low-cost and convenient reagents. In addition, gas adsorption data for the MSU-H silicas allowed us to examine the accuracy of a recently proposed procedure for calculation of the pore size distributions, calibrated using MCM-41 silicas and extrapolated over larger pore sizes. It was found that this procedure overestimates pore diameters for MSU-H silicas, which might be related to the inaccuracy of the aforementioned extrapolation, or to deviations of the MSU-H pore shape from uniform cylindrical pores with the length much larger than the pore diameter.
引用
收藏
页码:7663 / 7670
页数:8
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共 52 条
  • [11] Optically, defined multifunctional patterning of photosensitive thin-film silica mesophases
    Doshi, DA
    Huesing, NK
    Lu, MC
    Fan, HY
    Lu, YF
    Simmons-Potter, K
    Potter, BG
    Hurd, AJ
    Brinker, CJ
    [J]. SCIENCE, 2000, 290 (5489) : 107 - 111
  • [12] Preparation of noble metal nanowires using hexagonal mesoporous silica SBA-15
    Han, YJ
    Kim, JM
    Stucky, GD
    [J]. CHEMISTRY OF MATERIALS, 2000, 12 (08) : 2068 - 2069
  • [13] Mesoporous silicate sequestration and release of proteins
    Han, YJ
    Stucky, GD
    Butler, A
    [J]. JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1999, 121 (42) : 9897 - 9898
  • [14] Ag nanowire formation within mesoporous silica
    Huang, MH
    Choudrey, A
    Yang, PD
    [J]. CHEMICAL COMMUNICATIONS, 2000, (12) : 1063 - 1064
  • [15] Fabrication of a novel polypyrrole/poly(methyl methacrylate) coaxial nanocable using mesoporous silica as a nanoreactor
    Jang, JS
    Lim, B
    Lee, J
    Hyeon, T
    [J]. CHEMICAL COMMUNICATIONS, 2001, (01) : 83 - 84
  • [16] Standard nitrogen adsorption data for characterization of nanoporous silicas
    Jaroniec, M
    Kruk, M
    Olivier, JP
    [J]. LANGMUIR, 1999, 15 (16) : 5410 - 5413
  • [17] Synthesis of new, nanoporous carbon with hexagonally ordered mesostructure
    Jun, S
    Joo, SH
    Ryoo, R
    Kruk, M
    Jaroniec, M
    Liu, Z
    Ohsuna, T
    Terasaki, O
    [J]. JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2000, 122 (43) : 10712 - 10713
  • [18] Synthesis of porous palladium superlattice nanoballs and nanowires
    Kang, H
    Jun, Y
    Park, JI
    Lee, KB
    Cheon, J
    [J]. CHEMISTRY OF MATERIALS, 2000, 12 (12) : 3530 - +
  • [19] One-step synthesis of ordered mesocomposites with non-ionic amphiphilic block copolymers: implications of isoelectric point, hydrolysis rate and fluoride
    Kim, JM
    Han, YJ
    Chmelka, BF
    Stucky, GD
    [J]. CHEMICAL COMMUNICATIONS, 2000, (24) : 2437 - 2438
  • [20] Synthesis of highly ordered mesoporous silica materials using sodium silicate and amphiphilic block copolymers
    Kim, JM
    Stucky, GD
    [J]. CHEMICAL COMMUNICATIONS, 2000, (13) : 1159 - 1160