Abstract In parallel with recent developments in carbon nanomaterials, there is growing interest in using these nanomaterials for desalination. To date, many studies have affirmed the potential of using such nanomaterials for constant pressure desalination operation. In this work, the performance of such membrane when subjected to oscillatory pressure at sub-nanosecond is investigated in detail. Using the transverse flow CNT membrane operating at periods ranging from 0.02 to 0.1 ns, we find that oscillatory pressure operation can increase the permeability of the membrane by 16% with a salt rejection close to 100%. Detailed studies on the salt concentration profile, water orientation and water permeance behavior revealed that this increase in permeability is due to the development of resistance to reverse flow at higher periods of oscillation. Further extension of the analysis to periods on the order of 0.1 ns and beyond do not show a positive influence on water permeability. Thus, this work shows that periods on the order of 10−2 ns are required for improved performance of low dimensional nanomaterials membrane. The results from this work shows that nanomaterials membrane is suitable for oscillatory operation, such as electrodialysis reversal. Due to the nanoscale sized of the membrane channels, sub-nanoseconds pulsations are more effective in introducing instabilities to the system to positively influence the water permeance behavior of the membrane.

中文翻译：

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振荡压力对横流碳纳米管膜脱盐性能的影响

摘要 随着碳纳米材料的最新发展，人们对使用这些纳米材料进行海水淡化越来越感兴趣。迄今为止，许多研究已经肯定了使用这种纳米材料进行恒压脱盐操作的潜力。在这项工作中，详细研究了这种膜在亚纳秒振荡压力下的性能。使用在 0.02 到 0.1 ns 范围内运行的横向流动 CNT 膜，我们发现振荡压力操作可以将膜的渗透性增加 16%，脱盐率接近 100%。对盐浓度剖面、水方向和水渗透行为的详细研究表明，渗透率的这种增加是由于在较高的振荡周期产生了对逆流的阻力。将分析进一步扩展到 0.1 ns 及以上的时间段并没有显示出对水渗透率的积极影响。因此，这项工作表明，为了提高低维纳米材料膜的性能，需要大约 10-2 ns 的周期。这项工作的结果表明，纳米材料膜适用于振荡操作，如电渗析逆转。由于膜通道的纳米级尺寸，亚纳秒脉动更有效地将不稳定性引入系统，从而对膜的透水行为产生积极影响。这项工作表明，提高低维纳米材料膜的性能需要大约 10-2 ns 的周期。这项工作的结果表明，纳米材料膜适用于振荡操作，如电渗析逆转。由于膜通道的纳米级尺寸，亚纳秒脉动更有效地将不稳定性引入系统，从而对膜的透水行为产生积极影响。这项工作表明，提高低维纳米材料膜的性能需要大约 10-2 ns 的周期。这项工作的结果表明，纳米材料膜适用于振荡操作，如电渗析逆转。由于膜通道的纳米级尺寸，亚纳秒脉动更有效地将不稳定性引入系统，从而对膜的透水行为产生积极影响。