Li Linpeng, Yang Tonghui, Wang Kun, Fan Hongwei, Hou Chengyi, Zhang Qinghong, Li Yaogang, Yu Hao, Wang Hongzhi
State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, China.
Engineering Research Center of Advanced Glasses Manufacturing Technology, College of Materials Science and Engineering, Donghua University, Shanghai 201620, China.
J Colloid Interface Sci. 2021 Feb 1;583:188-195. doi: 10.1016/j.jcis.2020.09.050. Epub 2020 Sep 22.
Widespread approaches to fabricate surfaces with aligned nanostructured topographies have been stimulated by opportunities to enhance interface performance by combing physical and chemical effects, in which brush-coating technology (BCT) is a cost-effective and feasible method for aligned film and large-scale production. Here, we reported a BCT process to realize the alignment of various 1D nanostructures through mechanical design that provides a more precise and higher shear force. By regulating the viscosity of dispersion, shear force is proved to be 24 and 20.3 times larger (when the volume ratio of water and glycerol is 1:3) according to the theoretical calculation and ANSYS simulating calculation results respectively, which plays a vital role in brush coating process. The universality was demonstrated by the alignment of one-dimension nanomaterials with different diameters, including silver nanowires (80 nm), molybdenum trioxide nanobelts (150 nm), vanadium pentoxide nanobelts (150 nm) and bismuth sulfide nanobelts (200 nm), et al., which in consequence have different alignment ratios. Meanwhile, anisotropic and flexible electrical conductors (the resistance anisotropic ratio was 2) and thermoelectric films (Seebeck coefficient was calculated to be 56.7 µV/K) were demonstrated.
通过结合物理和化学效应来提高界面性能的机会，激发了广泛用于制造具有排列纳米结构形貌表面的方法，其中刷涂技术（BCT）是一种用于排列薄膜和大规模生产的经济高效且可行的方法。在此，我们报道了一种BCT工艺，通过机械设计实现各种一维纳米结构的排列，该设计提供了更精确和更高的剪切力。通过调节分散体的粘度，根据理论计算和ANSYS模拟计算结果，剪切力分别被证明大24倍和20.3倍（当水和甘油的体积比为1:3时），这在刷涂过程中起着至关重要的作用。通过对不同直径的一维纳米材料进行排列证明了其通用性，包括银纳米线（80 nm）、三氧化钼纳米带（150 nm）、五氧化二钒纳米带（150 nm）和硫化铋纳米带（200 nm）等，因此它们具有不同的排列率。同时，展示了各向异性和柔性导电体（电阻各向异性比为2）和热电薄膜（塞贝克系数经计算为56.7 μV/K）。
