通过密集的碳纳米管膜进行封闭离子运输
Miao Yu1, Hans H Funke, John L Falconer
1Department of Chemical and Biological Engineering, University of Colorado, Boulder, Colorado 80309-0424, USA.
Journal of the American Chemical Society
|May 28, 2010
概括
通过疏水纳米孔的离子扩散受到水浸透性的变化所阻碍. 温度或超声波可以开启/关闭离子流,影响水处理应用.
科学领域:
- 材料科学 材料科学 材料科学
- 纳米技术 纳米技术
- 物理化学 物理化学
背景情况:
- 门离子扩散在生物纳米孔中至关重要,受各种外部刺激的影响.
- 疏水纳米孔中的水浸透性显著影响离子扩散,特别是在外部变化下.
- 了解疏水纳米通道中的离子运输是开发先进分离技术的关键.
研究的目的:
- 为了研究高度疏水性纳米孔中的封闭离子扩散行为.
- 探索水浸透性变化对通过碳纳米管膜的离子运输的影响.
- 为了证明碳纳米管膜在海水淡化等应用中的潜力.
主要方法:
- 使用溶剂蒸发工艺制备具有3纳米CNT和间隙孔的密集碳纳米管 (CNT) 膜.
- 在不同温度和超声波下通过CNT膜研究离子扩散行为.
- 在CNT膜上分析水吸附异热体,以了解湿度变化.
主要成果:
- 通过疏水性CNT膜的离子扩散表现出封闭的行为,离子流被打开和关闭.
- 离子流在298K停止,但随着20K的温度升高或超声波应用而大幅增加.
- 随着温度的增加,水吸附率显著增加,这表明毛细血管凝结和从不连续到连续的水相的转变.
结论:
- 由于温度或超声波引起的水表面的水浸透性变化,控制着封闭的离子扩散.
- 碳纳米管膜表现出可调节的离子输送特性,为淡化和水处理开辟了可能性.
- 这些发现凸显了纳米孔状材料中水表面相互作用对于控制离子运输的重要性.
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