Assembly of large-pore silica mesophases with wormhole framework structures from α,ω-diamine porogens

被引:57
|
作者
Park, I [1 ]
Wang, Z [1 ]
Pinnavaia, TJ [1 ]
机构
[1] Michigan State Univ, Dept Chem, E Lansing, MI 48824 USA
关键词
D O I
10.1021/cm048627u
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
Large-pore mesoporous silicas with wormhole framework structures have been assembled through hydrogen-bonding pathways from sodium silicate or tetraethyl orthosilicate (TEOS) as the silica source and amine-terminated Jeffamine surfactants of the type H2NCH(CH3)CH2[OCH2CH(CH3)](x)NH2 as the structure-directing porogen. Depending on the molecular weight of the alpha,omega-diamine surfactant (x similar to 33 and 68 for Jeffamine D2000 and D4000, respectively) and the synthesis temperature (25-65 degreesC), the mean pore size distributions of the mesostructured silicas (denoted MSU-J) were centered between 4.9 and 14.3 nm, making these materials comparable to hexagonal SBA-15 mesostructures in average framework pore size. In addition to the BET surface areas of MSU-J silicas (408-1127 m(2)/g) being comparable to those of SBA-15 (630-1040 m(2)/g), MSU-J silicas exhibit larger pore volumes (1.37-2.29 cm(3)/g) than SBA-15 silicas (0.56-1.23 cm(3)/g) prepared in the absence of mesitylene. MSU-J wormhole mesostructures represent the largest pore sizes observed to date for a fully three-dimensional mesoporous framework assembled from a single micellar porogen. Only mesostructured micellar foam structures exhibit larger pore sizes, but the preparation of foam structures requires the use of more complex microemulsions or latex polymers as porogens.
引用
收藏
页码:383 / 386
页数:4
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