Abstract Biporous nanocarbon foams (NC foams) which have both nano-pores and micro-pores, were fabricated and used to explore the liquid transportation in the porous structures formed by nanomaterials. Scanning electron microscopy was utilized to observe the structure of the NC foams. Capillary rise tests using acetone as the working fluid were conducted by the IR thermal imaging method. The results show that the capillary rise height of the NC foam with 65 μm micro-pore size was 47% higher than that with 9 μm micro-pore size in 50 s. The capillary performance of the NC foams was reduced when its density was higher than 60 mg/cm3. A model is built to illustrate the effect of both nano-structure and micro-structure on the transportation of working fluid in the biporous foam. The data indicates that the nano-structure generated high capillary pressure while the micro-structure provided low resistant pathways for fast liquid transportation. The size of micro-pores and the ratio of micro-pores to nano-pores were two important factors. It is demonstrated that the NC foams had large sorption capacity up to 878 mg/cm3 and their capillary performance was further enhanced when using a substrate.

中文翻译：

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双孔纳米碳泡沫及其结构对毛细管性能的影响

摘要 制备了具有纳米孔和微孔的双孔纳米碳泡沫（NC泡沫），用于探索纳米材料形成的多孔结构中的液体传输。使用扫描电子显微镜观察 NC 泡沫的结构。使用丙酮作为工作流体的毛细管上升测试是通过红外热成像方法进行的。结果表明，65 μm 微孔 NC 泡沫的毛细管上升高度比 9 μm 微孔 NC 泡沫在 50 s 内升高 47%。当密度高于 60 mg/cm3 时，NC 泡沫的毛细管性能降低。建立模型来说明纳米结构和微观结构对双孔泡沫中工作流体输送的影响。数据表明，纳米结构产生了高毛细管压力，而微结构为快速液体输送提供了低阻力通道。微孔的大小和微孔与纳米孔的比例是两个重要的因素。结果表明，NC 泡沫具有高达 878 mg/cm3 的大吸附容量，并且在使用基材时其毛细管性能进一步增强。