Hayward Ryan C, Alberius Peter C A, Kramer Edward J, Chmelka Bradley F
Department of Chemical Engineering, University of California, Santa Barbara, California 93106, USA.
Langmuir. 2004 Jul 6;20(14):5998-6004. doi: 10.1021/la030442z.
Thin films ofbicontinuous cubic mesostructured silica were formed using the nonionic poly(oxyethylene)-alkyl ether surfactant Brij-56 as a structure-directing agent. The synthesis conditions were chosen such that the estimated volume fraction of surfactant in the silica/surfactant films corresponded approximately to the composition at which the bicontinuous cubic phase occurs in the water/surfactant phase diagram. Small-angle X-ray scattering and transmission electron microscopy measurements reveal that the cubic phase corresponds to the Ia3(-)d double-gyroid structure, with some distortion due to anisotropic film shrinkage. The cubic structure grows as faceted domains that are well-oriented with respect to the substrate and often occur in coexistence with a lamellar phase. By adjusting the temperature at which the films are aged, it is possible to create films with 2D hexagonal, cubic, or lamellar structures at a single composition.
使用非离子型聚（氧乙烯）-烷基醚表面活性剂Brij-56作为结构导向剂，制备了双连续立方介孔结构二氧化硅薄膜。选择合成条件，使得二氧化硅/表面活性剂薄膜中表面活性剂的估计体积分数大致对应于水/表面活性剂相图中双连续立方相出现的组成。小角X射线散射和透射电子显微镜测量表明，立方相对应于Ia3(-)d双螺旋结构，由于各向异性薄膜收缩而存在一些畸变。立方结构以相对于基底取向良好的多面体畴形式生长，并且经常与层状相共存。通过调节薄膜老化的温度，可以在单一组成下制备具有二维六方、立方或层状结构的薄膜。
