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Assembly of carbon nanotubes into microparticles with tunable morphologies using droplets in a non-equilibrium state

机译：使用非平衡态的液滴将碳纳米管组装成具有可调形态的微粒

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Carbon nanomaterials assembled into micrometer-scale configurations are highly useful because of their unique molecular transport and adsorption properties, improved operability, and versatility in industrial/research applications. Here we propose a facile approach to assemble carbon nanotubes (CNTs) into monodisperse microparticles through rapid condensation and accumulation of CNTs in aqueous droplets in a non-equilibrium state. The droplets were generated by means of a microfluidic process or membrane emulsification, using a water-soluble polar organic solvent as the continuous phase. Because water molecules in the droplets were rapidly dissolved into the continuous phase, the CNTs were dramatically condensed and stable microparticles were finally formed. We prepared microparticles using both multi-walled and single-walled CNTs, and the size was controllable in the range of 10–40 μm simply by changing the initial CNT concentration. Interestingly, the morphologies of the particles were not spherical in many cases, and they were controllable by changing the type of the organic solvent and/or using additives in the dispersed phase. Physicochemical characterization suggested good compatibility of the CNT microparticles when used as supports for catalysts, adsorbents, and electrodes.
机译：组装成微米级配置的碳纳米材料非常有用，因为它们具有独特的分子传输和吸附特性，改进的可操作性以及在工业/研究应用中的多功能性。在这里，我们提出了一种简便的方法，可以通过碳纳米管在非平衡状态下在水滴中的快速缩合和聚集来将碳纳米管（CNT）组装成单分散的微粒。使用水溶性极性有机溶剂作为连续相，通过微流工艺或膜乳化产生液滴。由于液滴中的水分子迅速溶解到连续相中，CNT急剧凝结，最终形成稳定的微粒。我们使用多壁和单壁CNT制备了微粒，只需改变初始CNT的浓度即可将其尺寸控制在10–40μm的范围内。有趣的是，粒子的形态在许多情况下不是球形的，并且可以通过改变有机溶剂的类型和/或在分散相中使用添加剂来控制。理化特性表明，当用作催化剂，吸附剂和电极的载体时，CNT微粒具有良好的相容性。

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