Formation and structure of self-assembled silica nanoparticles in basic solutions of organic and inorganic cations

被引：98
|
作者：
Fedeyko, JM [1 ]
Vlachos, DG [1 ]
Lobo, RF [1 ]
机构：
[1] Univ Delaware, Ctr Catalyt Sci & Technol, Dept Chem Engn, Newark, DE 19716 USA
来源：
LANGMUIR | 2005年 / 21卷 / 11期
关键词：
D O I：
10.1021/la0468390
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
The phase behavior of silica solutions containing organic and inorganic cations was studied at room temperature using conductivity, pH, and small-angle scattering experiments. A critical aggregation concentration (cac) was observed at similar to 1:1 ratio of SiO2/OH- for all cation solutions from conductivity and pH studies. From this cac, a phase diagram of the system was developed with three distinct phase regions in pseudoequilibrium: a monomer/oligomer region (I), a monomer/oligomer/nanoparticle region (II), and a gel region (III). Small-angle X-ray and neutron scattering (SAXS and SANS) on solutions of region II formed with tetrapropylammonium hydroxide (TPAOH) revealed that the nanoparticles have a core-shell structure. Structure analysis of the SAXS and SANS data was best fit by a core-shell oblate ellipsoid model. A polydisperse set of core-shell spheres also fit the data well although with lower agreement factors. Similar nanoparticle morphologies were found in solutions of TMAOH, CsOH, and NaOH.
引用
收藏
页码：5197 / 5206
页数：10
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