Université de Lorraine, SRSMC, UMR7565, F-54506 Vandoeuvre-lès-Nancy cedex, France.
Langmuir. 2012 Jun 26;28(25):9816-24. doi: 10.1021/la301413u. Epub 2012 Jun 11.
Herein, we report the formation of organized mesoporous silica materials prepared from a novel nonionic gemini surfactant, myristoyl-end-capped Jeffamine, synthesized from a polyoxyalkyleneamine (ED900). The behavior of the modified Jeffamine in water was first investigated. A direct micellar phase (L(1)) and a hexagonal (H(1)) liquid crystal were found. The structure of the micelles was investigated from the SAXS and the analysis by generalized indirect Fourier transformation, which show that the particles are globular of core-shell type. The myristoyl chains, located at the ends of the amphiphile molecule, are assembled to form the core of the micelles and, as a consequence, the molecules are folded over on themselves. Mesoporous materials were then synthesized from the self-assembly mechanism. The recovered materials were characterized by SAXS measurements, nitrogen adsorption-desorption analysis, and transmission and scanning electron microscopy. The results clearly evidence that by modifying the synthesis parameters, such as the surfactant/silica precursor molar ratio and the hydrothermal conditions, one can control the size and the nanostructuring of the resulting material. It was observed that, the lower the temperature of the hydrothermal treatment, the better the mesopore ordering.
本文报道了一种新型非离子型Gemini 表面活性剂——由聚氧亚烷基胺（ED900）合成的豆蔻酰封端 Jeffamine 制备有序介孔硅材料的形成。首先研究了改性 Jeffamine 在水中的行为。发现了直接胶束相（L(1)）和六方（H(1)）液晶。通过小角 X 射线散射（SAXS）和广义间接傅里叶变换分析研究了胶束的结构，结果表明颗粒为核壳型球形。位于两亲分子末端的豆蔻酰链组装形成胶束的核，因此分子自身折叠。然后从自组装机制合成介孔材料。通过小角 X 射线散射（SAXS）测量、氮气吸附-解吸分析以及透射和扫描电子显微镜对回收材料进行了表征。结果清楚地表明，通过改变合成参数，如表面活性剂/硅前体摩尔比和水热条件，可以控制所得材料的尺寸和纳米结构。观察到，水热处理温度越低，介孔有序性越好。
