Influence of alkyl peptidoamines on the structure of functionalized mesoporous silica

被引:29
作者
Blin, JL
Gérardin, C
Rodehüser, L
Selve, C
Stébé, MJ
机构
[1] Univ Nancy 1, Fac Sci, CNRS,UMR 7565, Equipe Phys Chim Colloides, F-54506 Vandoeuvre Les Nancy, France
[2] Univ Nancy 1, Fac Sci, CNRS,UMR 7565, Equipe Mat Tensioact, F-54506 Vandoeuvre Les Nancy, France
关键词
D O I
10.1021/cm049452r
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
The functionalization of mesoporous silica materials with alkyl peptidoamines by the cocondensation method was investigated. Alkylpeptidoamines were introduced via (aminopropyl)triethoxysilane (APTES). Samples were prepared by using a nonionic fluorinated surfactant CF3(CF2)(7)C2H4(OC2H4)(9)OH. Results obtained by SAXS and nitrogen adsorption-desorption analysis clearly showed that the channel arrangement of the recovered materials depends not only on the organosilane/(organosilane+tetramethyl orthosilicate) molar fraction but also on the nature of the functional groups. Indeed, materials functionalized with BOC-Phe-APTES or with small amounts of BOC-Glu(alphaOBn)-betaAla-APTES exhibit a hexagonal channel array. Higher BOC-Glu(alphaObetan)-betaAla-APTES loading leads to a wormhole-like mesostructure. Whatever the organosilane/(organosilane+tetramethyl orthosilicate) molar fraction, only disordered structures are recovered when functionalization is performed with Z-Asp(alphaOBn)-APTES. Moreover, the pore wall thickness is strongly affected by the structure of the organic groups. The efficiency of the functionalization was evidenced by FTIR and solid state Si-29 and C-13 MAS NMR spectroscopies. Results obtained from solid state Si-29 NMR also show that polymerization rates of organosilane and tretramethyl orthosilicate must be very close to each other.
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页码:5071 / 5080
页数:10
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