通过子纳米直径垂直对齐的碳纳米管膜快速运输水
Da-Chi Yang1, Richard J Castellano2, Ricardo Prada Silvy2
1Mechanical and Aerospace Engineering, Rutgers University, Piscataway, New Jersey 08854, United States.
Nano letters
|June 5, 2023
概括
新的碳纳米管 (CNT) 膜具有亚纳米孔,可实现高效的水运输. 这些膜显示水流量显著增强,这表明了水过和海水淡化技术的潜力.
科学领域:
- 材料科学 材料科学 材料科学
- 纳米技术纳米技术
- 流体动力学 流体动力学
背景情况:
- 碳纳米管 (CNTs) 具有独特的质量运输特性,特别是对于水流.
- 开发具有受控CNT孔径的宏观膜对于先进的应用至关重要.
研究的目的:
- 通过具有垂直导向,亚纳米 (0.8 nm) 碳纳米管孔的新型宏观膜报告水运输.
- 研究CNT直径对水运动力学和水力动力学滑动的影响.
主要方法:
- 使用可扩展的基于溶液的方法制造CNT膜,并对单壁CNT (SWCNT) 进行电场对齐.
- 用等离子蚀刻创建开放的,垂直对齐的CNT孔隙.
- 测量通过膜的压力驱动的水运输,具有不同的CNT孔径 (0.8nm和3nm).
主要成果:
- 实现了快速的压力驱动水运输,比理论上的无滑流量提高了105倍.
- 观察到增加的水力动力滑动长度与CNT直径的减少,达到8.5μm的0.8纳米CNTs.
- 发现,在直径小的CNT中,水运输是由入口阻力主导的,独立于纳米管的长度.
结论:
- 具有亚纳米 CNT 孔的可扩展性制造膜显示出异常高的水运输效率.
- 这些发现突出了这些膜在过,海水淡化和能源采集等应用中的潜力.
- 亚纳米 CNTs 的水力动力学行为受到孔径和入口效应的强烈影响.
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