Kinetics of the Formation of 2D-Hexagonal Silica Nanostructured Materials by Nonionic Block Copolymer Templating in Solution

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• 作者：Sabine Manet ; Julien Schmitt ; Marianne Impe虂ror-Clerc ; Vladimir Zholobenko ; Dominique Durand ; Cristiano L. P. Oliveira ; Jan Skov Pedersen ; Christel Gervais ; Niki Baccile ; Florence Babonneau ; Isabelle Grillo ; Florian Meneau ; Cyrille Rochas
• 刊名：Journal of Physical Chemistry B
• 出版年：2011
• 出版时间：October 6, 2011
• 年：2011
• 卷：115
• 期：39
• 页码：11330-11344
• 全文大小：1204K
• 年卷期：v.115,no.39(October 6, 2011)
• ISSN：1520-5207

文摘

The different steps of the self-assembly in solution of several 2D-hexagonal silica nanostructured SBA-15 materials have been investigated by SAXS and SANS in situ experiments. Unique quantitative information about the shape and size evolution upon time of the micellar aggregates throughout the self-assembly process is obtained using a complete model that describes well the scattering data for the various synthesis conditions. In all cases, before the precipitation of the material, the micelles shape changes from spherical to rod-like, where the structure of the rod-like micelles is linked to the structure of the 2D-hexagonal precipitated material. In addition, the kinetics of hydrolysis of the inorganic precursor (TEOS) has been determined by in situ Raman spectroscopy. More specifically, by comparing synthesis made with different acids (HNO₃, HBr, HCl, H₂SO₄, and H₃PO₄), it is found that materials prepared using the 鈥渟alting-out鈥?anions (SO₄^2- and H₂PO₄^{鈥?/sup>) are much better ordered than with the 鈥渟alting-in鈥?anions (NO₃鈥?/sup> and Br鈥?/sup>).}