Department of Chemistry, University of Bath, Claverton Down, Bath, United Kingdom.
Langmuir. 2013 Mar 26;29(12):4148-58. doi: 10.1021/la4001329. Epub 2013 Mar 11.
Polymer/silica composite films, stable to calcination, were produced using catanionic surfactant mixtures (hexadecyltrimethylammonium bromide (CTAB) and sodium dodecyl sulfate (SDS)) and polymers (polyethylenimine (PEI) or polyacrylamide (PAAm)) at the air/water interface. Film formation processes were probed by time-resolved neutron reflectivity measurements. Grazing incidence X-ray diffraction (GID) measurements indicate that the mesophase geometry of the interfacial films could be controlled to give lamellar, 2D hexagonal, and several cubic phases (Pn3¯m, Fm3¯m, and Im3¯m) by varying the polyelectrolyte molecular weight, polyelectrolyte chemical nature, or the cationic:anionic surfactant molar ratio. On the basis of GID results, a phase diagram for the catanionic surfactant/polyelectrolyte/TMOS film system was drawn. These films can be easily removed from the interface and mesoporous silica films which retain the film geometry can be obtained after calcination; moreover, this film preparation method provides a simple way to impart polymer functionality into the mesostructured silica wall, which means these films have potential applications in a variety of fields such as catalysis, molecular separation, and drug delivery.
采用具有相反电荷的表面活性剂混合物（十六烷基三甲基溴化铵（CTAB）和十二烷基硫酸钠（SDS））和聚合物（聚乙烯亚胺（PEI）或聚丙烯酰胺（PAAm））在空气/水界面制备了稳定的煅烧聚合物/二氧化硅复合膜。通过时间分辨中子反射测量研究了成膜过程。掠入射 X 射线衍射（GID）测量表明，通过改变聚电解质分子量、聚电解质化学性质或阳离子：阴离子表面活性剂摩尔比，可以控制界面膜的介相几何形状，得到层状、二维六方和几种立方相（Pn3¯m、Fm3¯m 和 Im3¯m）。基于 GID 结果，绘制了具有相反电荷的表面活性剂/聚电解质/TMOS 膜体系的相图。这些膜可以很容易地从界面上除去，并且在煅烧后可以得到保留膜几何形状的介孔二氧化硅膜；此外，这种膜制备方法为将聚合物功能赋予介孔结构的二氧化硅壁提供了一种简单的方法，这意味着这些膜在催化、分子分离和药物输送等多种领域具有潜在的应用。
