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在墙壁附近的碳纳米管沿着水的更快的扩散

Golam Rosul Khan¹, Shinji Saito², Snehasis Daschakraborty¹

¹Department of Chemistry, Indian Institute of Technology Patna, Patna, Bihar 801106, India.

The journal of physical chemistry. B

|June 18, 2025

概括

在碳纳米管 (CNT) 中的水扩散在墙壁附近更快,特别是在低温下. 分子动力学模拟显示,由于减弱的键和减少的摩擦,增强了轴向扩散和旋转动力学.

科学领域:

物理化学物理化学
材料科学材料科学材料科学
纳米技术纳米技术

背景情况:

碳纳米管 (CNTs) 中的水扩散不太清楚,关于辐射扩散模式和温度效应的争论仍在进行中.
了解受限水的动态对于过,能源和生物系统的应用至关重要.

研究的目的:

为了研究水在CNT内部的辐射分离扩散.
为了确定温度对 CNT 中水的转换和旋转动态的影响.
阐明控制水-CNT相互作用的分子机制.

主要方法:

利用分子动力学 (MD) 模拟,在直径为3.57nm的CNT中模拟水扩散.
在广泛的温度谱中分析了水的动态,包括超冷的条件.
解决了纳米管内的扩散和旋转运动成不同的辐射层.

主要成果:

与散装水相比,轴向水扩散明显增强,在较低的温度下增强更大.
超冷却进一步放大轴向扩散,表现出接近阿雷尼乌斯的行为.
转移和旋转动力学在CNT壁附近更为明显,这归因于键的减弱和悬挂的O-H键的摩擦减少.

结论:

在CNT中,水的动态取决于层级,在墙壁附近的运动更快.
温度在增强轴向扩散方面发挥着关键作用,特别是在超冷的条件下.
MD的结果提供了关于受限水行为的实验性NMR数据的精细解释.

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