School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, People's Republic of China.
ACS Appl Mater Interfaces. 2013 Aug 14;5(15):7458-64. doi: 10.1021/am401774r. Epub 2013 Jul 16.
In this work, we report the preparation of a free-standing membrane with strong mechanical stability and flexibility through a facile vacuum filtration approach. A field-emission scanning electron microscopy image demonstrates that the membrane composed of MnO2 nanowires is 50 nm in width and up to 100 μm long and the nanowires are assembled in parallel into bundles. A possible formation mechanism for the ultralong nanowires and the free-standing membrane has been proposed. Meanwhile, the properties of the membrane could be controlled by incorporating different materials to achieve composite membranes. In order to demonstrate the broad applicability of the MnO2 membrane, we fabricate a variety of composite membranes exhibiting various novel properties including magnetism and reversibly switchable wettability between hydrophilicity and hydrophobicity through various material modification, including CoFe2O4 nanoparticles and organic triethoxy(octyl)silane. Furthermore, the free-standing membrane could also simultaneously be functionalized with two materials, which reveal multiple properties. The synthesis method of a free-standing MnO2 membrane is simple and environmentally friendly, and it is easily scalable for industry. These composite membranes constitute a significant contribution to advanced technology.
在这项工作中，我们通过简便的真空过滤方法制备了具有强机械稳定性和柔韧性的独立膜。场发射扫描电子显微镜图像表明，由 MnO2 纳米线组成的膜宽 50nm，长达 100μm，纳米线平行组装成束。提出了一种可能的超长长纳米线和独立膜的形成机制。同时，通过掺入不同的材料，可以控制膜的性能，以实现复合膜。为了证明 MnO2 膜的广泛适用性，我们通过各种材料修饰，包括 CoFe2O4 纳米粒子和有机三乙氧基（辛基）硅烷，制备了各种具有各种新颖性能的复合膜，包括磁性和润湿性在亲水性和疏水性之间的可反复切换。此外，独立膜还可以同时功能化两种材料，从而呈现出多种性能。MnO2 膜的合成方法简单环保，易于工业化扩展。这些复合膜为先进技术做出了重要贡献。
