Lindemann Peter, Träutlein Yannick, Wöll Christof, Tsotsalas Manuel
Institute of Functional Interfaces, Karlsruhe Institute of Technology.
Institute of Functional Interfaces, Karlsruhe Institute of Technology;
J Vis Exp. 2015 Dec 15(106):e53324. doi: 10.3791/53324.
CMP as large surface area materials have attracted growing interest recently, due to their high variability in the incorporation of functional groups in combination with their outstanding thermal and chemical stability, and low densities. However, their insoluble nature causes problems in their processing since usually applied techniques such as spin coating are not available. Especially for membrane applications, where the processing of CMP as thin films is desirable, the processing problems have hindered their commercial application. Here we describe the interfacial synthesis of CMP thin films on functionalized substrates via molecular layer-by-layer (l-b-l) synthesis. This process allows the preparation of films with desired thickness and composition and even desired composition gradients. The use of sacrificial supports allows the preparation of freestanding membranes by dissolution of the support after the synthesis. To handle such ultra-thin freestanding membranes the protection with sacrificial coatings showed great promise, to avoid rupture of the nanomembranes. To transfer the nanomembranes to the desired substrate, the coated membranes are upfloated at the air-liquid interface and then transferred via dip coating.
共价有机框架材料（CMP）作为大表面积材料，由于其在功能基团掺入方面具有高度可变性，同时具备出色的热稳定性和化学稳定性以及低密度，近年来受到了越来越多的关注。然而，其不溶性导致加工过程中出现问题，因为通常采用的诸如旋涂等技术并不适用。特别是对于膜应用而言，期望将CMP加工成薄膜，但其加工问题阻碍了它们的商业应用。在此，我们描述了通过逐层分子（l-b-l）合成在功能化基底上进行CMP薄膜的界面合成。该过程能够制备具有所需厚度和组成甚至所需组成梯度的薄膜。使用牺牲性支撑体使得在合成后通过溶解支撑体来制备独立的膜成为可能。为了处理这种超薄独立膜，用牺牲性涂层进行保护显示出巨大的前景，以避免纳米膜破裂。为了将纳米膜转移到所需的基底上，将涂覆的膜漂浮在气 - 液界面，然后通过浸涂进行转移。
