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Ionic and Molecular Transport Through Graphene Membranes

机译：通过石墨烯膜的离子和分子运输

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摘要

New membrane materials have the potential to address some of the persistent challenges in water purification to improve the flux of water, selectivity to ions or contaminants, and fouling resistance. With its atomistic thickness and the ability to sustain nanometer-scale holes, graphene promises significant enhancement in the flux of water while offering potentially novel transport properties. In this work, the transport of ions and molecules through a single layer of graphene were measured as a first step towards realizing practical graphene membranes. Graphene grown by chemical vapor deposition (CVD) was transferred to a porous polycarbonate support membrane, and the diffusion of different salts and molecules was examined. While pressure-driven flow measurements revealed that the graphene covered the polycarbonate support membrane, diffusion experiments showed that it was permeable to salts, but not to larger molecules. This behavior was attributed to intrinsic defects in graphene in the 1-15 nm size range.
机译：新型膜材料有可能解决水净化方面的一些持续挑战，以改善水的通量，对离子或污染物的选择性以及耐污染性。石墨烯凭借其原子厚度和维持纳米级孔的能力，有望显着提高水通量，同时提供潜在的新型传输性能。在这项工作中，测量离子和分子通过单层石墨烯的传输是实现实用石墨烯膜的第一步。将通过化学气相沉积（CVD）生长的石墨烯转移到多孔聚碳酸酯支撑膜上，并检查了不同盐和分子的扩散。压力驱动的流量测量显示石墨烯覆盖了聚碳酸酯支撑膜，而扩散实验表明，石墨烯可渗透盐，但不能渗透较大的分子。此行为归因于石墨烯在1-15 nm尺寸范围内的固有缺陷。

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