Abstract It is widely accepted that the performance of carbon foams can be regulated by the tailoring of pore cell structures to meet the requirements of various applications. However, no theory has been used to date for guiding such regulation. In this work, carbon foams were prepared by saturating vitrinite concentrate with nitrogen gas under high pressure. The influence of key factors on the pore cell structure of carbon foams was investigated systematically. The results showed that the mean cell diameter and the bulk density of carbon foams can be regulated, respectively, in the ranges 140–440 µm and 0.29–0.75 g/cm3, which indicates that vitrinite concentrate separated from fat coal is highly suitable for the preparation of carbon foams. The variation trends of the pore cell structures were well explained by combining the homogeneous nucleation mechanism of microcellular polymer with the viscosity of the fusant formed from vitrinite concentrate. The inherent reason for all the variation trends is related to the gas nuclei density and viscosity of the fusant. More importantly, a strategy is suggested to successfully accomplish the design and regulation of the pore structure of carbon foams by taking into account the homogeneous nucleation mechanism and viscosity of the fusant.

中文翻译：

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基于微孔聚合物成核机理的煤基碳泡沫孔孔结构调控

摘要 碳泡沫的性能可以通过调整孔隙结构来调节以满足各种应用的要求，这一点已被广泛接受。然而，迄今为止，还没有任何理论用于指导此类监管。在这项工作中，碳泡沫是通过在高压下用氮气饱和镜质精矿来制备的。系统研究了关键因素对碳泡沫孔结构的影响。结果表明，碳泡沫的平均泡孔直径和堆积密度可以分别调节在 140-440 µm 和 0.29-0.75 g/cm3 范围内，这表明从肥煤中分离出的镜质精矿非常适用于制备碳泡沫。通过将微孔聚合物的均相成核机制与镜质体精矿形成的融合体的粘度相结合，可以很好地解释孔细胞结构的变化趋势。所有变化趋势的内在原因与熔体的气核密度和粘度有关。更重要的是，提出了一种策略，通过考虑熔体的均相成核机制和粘度，成功完成碳泡沫孔结构的设计和调节。