†Department of Chemistry and Center for Condensed Matter Sciences, National Taiwan University, Taipei 10617, Taiwan.
∥Department of Chemistry, National Taiwan Normal University, Taipei 11677, Taiwan.
J Am Chem Soc. 2015 Mar 25;137(11):3779-82. doi: 10.1021/jacs.5b01180. Epub 2015 Mar 17.
Here we introduce a new synthetic approach to grow mesoporous silica thin films with vertical mesochannels on centimeter-sized substrates via an oil-induced co-assembly process. Adding an oil, i.e., decane, into a CTAB-EtOH-TEOS ammonia solution leads to thin-film formation of mesoporous silica of controlled thickness between 20 and 100 nm with vertical mesochannels on various surfaces. The vertical mesoporous channels were evidenced by grazing incidence small-angle X-ray scattering (GISAXS), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) characterizations. Decane played two roles: (a) as a pore expansion agent (up to 5.7 ± 0.5 nm) and (b) inducing vertically oriented hexagonal mesophases of micelle-silica composite. The production of periodic and vertical nanochannels is very robust, over many different substrate surfaces (from silicon to polystyrene), various silica precursors (TEOS, fumed silica, or zeolite seed), and many oils (decane, petroleum ether, or ethyl acetate). This wide robustness in the formation of vertical nanophases is attributed to a unique mechanism of confined synthesis of surfactant-silicate between two identical thin layers of oils on a substrate.
在这里，我们介绍了一种新的合成方法，通过油诱导共组装过程在厘米级基底上生长具有垂直介孔的介孔硅薄膜。在 CTAB-EtOH-TEOS 氨溶液中添加油，例如癸烷，可导致介孔硅薄膜的形成，其厚度可控在 20nm 至 100nm 之间，并且在各种表面上具有垂直的介孔。通过掠入射小角 X 射线散射（GISAXS）、扫描电子显微镜（SEM）和透射电子显微镜（TEM）表征证实了垂直介孔通道的存在。癸烷发挥了两个作用：（a）作为孔膨胀剂（可达 5.7 ± 0.5nm）和（b）诱导垂直取向的胶束-二氧化硅复合六方相。周期性和垂直纳米通道的产生非常稳健，可以在许多不同的基底表面（从硅到聚苯乙烯）、各种二氧化硅前体（TEOS、气相二氧化硅或沸石种子）和许多油（癸烷、石油醚或乙酸乙酯）上实现。这种垂直纳米相形成的广泛稳健性归因于在基底上的两层相同油之间的受限合成表面活性剂-硅酸盐的独特机制。
