Self-Assembly of Condensable "Bola-Amphiphiles" in Water/Tetraethoxysilane Mixtures for the Elaboration of Mesostructured Hybrid Materials
Self-Assembly of Condensable "Bola-Amphiphiles" in Water/Tetraethoxysilane Mixtures for the Elaboration of Mesostructured Hybrid Materials
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DOI：
10.1021/la401885t
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发表时间：
2013-08-20
期刊：
影响因子：
3.9
通讯作者：
Pellet-Rostaing, S.
中科院分区：
文献类型：
--
作者：
Besnard, R.;Cambedouzou, J.;Pellet-Rostaing, S.
可冷凝两亲分子在水中的自组装是合成介观结构杂化材料的一种有吸引力的方法。在本文中，我们重点关注氨基十一烷基三乙氧基硅烷（AUT），它是一种可缩合的“bola-两亲物”，即在脂肪链两侧具有两个极性头的两亲分子。在这种情况下，一侧是可缩合的三乙氧基硅烷，另一侧是氨基。我们报告了 AUT 在水和四乙氧基硅烷 (TEOS) 混合物中的自组装。原位小角 X 射线散射 (SAXS) 测量使我们能够跟踪从液态到催化缩聚形成的固体材料的结构演变。根据介质成分，可以在最终材料中观察到六角形或层状结构。这些观察结果使我们能够提出一个 AUT 在水/TEOS 混合物中自组装的模型，我们能够通过 SAXS 剖面的模拟来验证该模型。通过利用这种系统的模块化，证明可以以简单的方式制备具有大量可用有机功能的各种结构杂化材料，而无需使用牺牲性表面活性剂分子。
The self-assembly of condensable amphiphile molecules in water is an attractive approach for the synthesis of mesostructured hybrid materials. In this article, we focus on aminoundecyltriethoxysilane (AUT), a condensable "bola-amphiphile", i.e., an amphiphilic molecule possessing two polar heads on both sides of an aliphatic chain. In the present case, one side is a condensable triethoxysilane, and the other side is an amino group. We report on the self-assembly of AUT in mixtures of water and tetraethoxysilane (TEOS). In situ small-angle X-ray scattering (SAXS) measurements allowed us to follow the evolution of the structure from the liquid state up to the solid material formed upon catalytic polycondensation. Depending on the medium composition, hexagonal or lamellar structures can be observed in the final material. These observations allowed us to propose a model for the self-assembly of AUT in water/TEOS mixtures that we were able to validate by simulations of the SAXS profiles. By taking advantage of the modularity of such a system, it proves possible to prepare in a simple way various structured hybrid materials possessing a high number of available organic functions without using sacrificial surfactant molecules.