Abrishamkar Afshin, Rodríguez-San-Miguel David, Rodríguez Navarro Jorge Andrés, Rodriguez-Trujillo Romen, Amabilino David B, Mas-Ballesté Ruben, Zamora Félix, deMello Andrew J, Puigmarti-Luis Josep
Institute of Chemical and Bioengineering, Department of Chemistry and Applied Bioscience, ETH Zurich.
Departamento de Química Inorgánica, Universidad Autónoma de Madrid.
J Vis Exp. 2017 Jul 10(125):56020. doi: 10.3791/56020.
Covalent Organic Frameworks (COFs) are a class of porous covalent materials which are frequently synthesized as unprocessable crystalline powders. The first COF was reported in 2005 with much effort centered on the establishment of new synthetic routes for its preparation. To date, most available synthetic methods for COF synthesis are based on bulk mixing under solvothermal conditions. Therefore, there is increasing interest in developing systematic protocols for COF synthesis that provide for fine control over reaction conditions and improve COF processability on surfaces, which is essential for their use in practical applications. Herein, we present a novel microfluidic-based method for COF synthesis where the reaction between two constituent building blocks, 1,3,5-benzenetricarbaldehyde (BTCA) and 1,3,5-tris(4-aminophenyl)benzene (TAPB), takes place under controlled diffusion conditions and at room temperature. Using such an approach yields sponge-like, crystalline fibers of a COF material, hereafter called MF-COF. The mechanical properties of MF-COF and the dynamic nature of the approach allow the continuous production of MF-COF fibers and their direct printing onto surfaces. The general method opens new potential applications requiring advanced printing of 2D or 3D COF structures on flexible or rigid surfaces.
共价有机框架（COF）是一类多孔共价材料，通常被合成为难于加工的结晶粉末。2005年报道了首例COF，当时人们付出了诸多努力，重点是建立制备它的新合成路线。迄今为止，大多数现有的COF合成方法都是基于溶剂热条件下的本体混合。因此，人们越来越有兴趣开发系统的COF合成方案，以实现对反应条件的精细控制，并改善COF在表面上的可加工性，这对于它们在实际应用中的使用至关重要。在此，我们提出了一种基于微流体的新型COF合成方法，其中两种组成结构单元1,3,5-苯三甲醛（BTCA）和1,3,5-三（4-氨基苯基）苯（TAPB）之间的反应在受控扩散条件下于室温进行。采用这种方法可得到一种海绵状的COF材料结晶纤维，以下称为MF-COF。MF-COF的机械性能以及该方法的动态特性使得能够连续生产MF-COF纤维，并将其直接打印到表面上。该通用方法为在柔性或刚性表面上进行二维或三维COF结构的先进打印开辟了新的潜在应用。
