Institut des Sciences de la Terre d'Orléans, CNRS-Université d'Orléans, 1A Rue de la Ferollerie, 45071 Orléans Cedex 2, France.
Langmuir. 2010 Dec 21;26(24):19175-80. doi: 10.1021/la1039267. Epub 2010 Nov 24.
A nonionic surfactant, triethylene glycol mono-n-decyl ether (C(10)E(3)), characterized by its lamellar phase state, was introduced in the interlayer of a Na-montmorillonite clay at several concentrations. The synthesized organoclays were characterized by small-angle X-ray scattering in conjunction with Fourier transform infrared spectroscopy and adsorption isotherms. Experiments showed that a bilayer of C(10)E(3) was intercalated into the interlayer space of the naturally exchanged Na-montmorillonite, resulting in the aggregation of the lyotropic liquid crystal state in the lamellar phase. This behavior strongly differs from previous observations of confinement of nonionic surfactants in clays where the expansion of the interlayer space was limited to two monolayers parallel to the silicate surface and cationic surfactants in clays where the intercalation of organic compounds is introduced into the clay galleries through ion exchange. The confinement of a bilayer of C(10)E(3) nonionic surfactant in clays offers new perspectives for the realization of hybrid nanomaterials, since the synthesized organoclays preserve the electrostatic characteristics of the clays, thus allowing further ion exchange while presenting at the same time a hydrophobic surface and a maximum opening of the interlayer space for the adsorption of neutral organic molecules of important size with functional properties.
一种非离子表面活性剂，三甘醇单壬醚（C(10)E(3)），以其层状相态为特征，在几个浓度下被引入到钠蒙脱石粘土的层间。合成的有机粘土通过小角 X 射线散射与傅里叶变换红外光谱和吸附等温线进行了表征。实验表明，C(10)E(3)的双层被插入到天然交换的 Na-蒙脱石的层间空间中，导致溶致液晶态在层状相中聚集。这种行为与以前在粘土中观察到的非离子表面活性剂的限制行为有很大的不同，在粘土中，层间空间的扩展仅限于与硅酸盐表面平行的两个单层，而在粘土中，阳离子表面活性剂的插入是通过离子交换引入到粘土孔道中的。在粘土中限制 C(10)E(3) 非离子表面活性剂的双层提供了实现混合纳米材料的新视角，因为合成的有机粘土保留了粘土的静电特性，从而允许进一步的离子交换，同时呈现出疏水性表面和最大的层间空间开口，用于吸附具有重要功能特性的中性有机分子。
