Small-Angle X-ray Scattering Study of the Formation of Colloidal SiO2 Stöber Multiplets
Small-Angle X-ray Scattering Study of the Formation of Colloidal SiO2 Stöber Multiplets
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胶体 SiO2 Stöber 多重态形成的小角 X 射线散射研究
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
H. Nirschl
中科院分区：
文献类型：
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作者：
V. Goertz;A. Gutsche;N. Dingenouts;H. Nirschl
本出版物的重点是根据Stober的溶胶-凝胶过程的SiO2多重态的具体合成。用小角X射线散射和透射电镜对实验结果进行了分析。为了评估各种聚集体结构（多重态）的实验散射数据，必须首先进行模拟，以研究多重态结构对散射数据的影响。结果表明，我们提出的非等距比QNI，两个不同的回转半径Rg的商，Guinier/Rg，qmax 1，允许一个非常简单和快速的评估的多重态结构。对于多重态结构的产生，改变氨浓度，同时保持其它工艺参数恒定。在低催化剂浓度下，由于初级颗粒的低稳定性，合成了所需的聚集体结构。随着氨浓度的增加，得到单一的，非聚集的颗粒。一个定义的初级颗粒大小是通过一个适应实现的。
The present publication focuses on the specific synthesis of SiO2 multiplets by the sol–gel process according to Stober. The experiments were analyzed by means of small-angle X-ray scattering and TEM. To evaluate the experimental scattering data of various aggregate structures (multiplets), simulations had to be performed first in order to study the influence of the multiplet structures on the scattering data. It was shown that the nonisometry ratio QNI proposed by us, the quotient of two different gyration radii Rg,Guinier/Rg,qmax1, allows for a very simple and rapid evaluation of the multiplet structure. For the production of multiplet structures, ammonia concentration was varied while keeping the other process parameters constant. At low catalyst concentrations, the aggregate structures desired were synthesized due to low stabilization of primary particles. With increasing ammonia concentration, single, nonaggregated particles were obtained. A defined primary particle size was achieved by an adaptation...