分子动力学模拟CO2在纳米孔中的分子行为:纳米尺度表面粗度的影响
Hongye Xu1,2, Yunfeng Liang3, Naipeng Zhao4
1School of Future Technology, China University of Geosciences, Wuhan, Hubei 430074, China.
Langmuir : the ACS journal of surfaces and colloids
|September 18, 2025
概括
在水库中的纳米级表面粗性会捕获二氧化碳 (CO2),减少其移动并增加其度. 较深的地表谷增加了二氧化碳的保留,这对于地质封存至关重要.
科学领域:
- 地质化学和材料科学 材料科学
- 计算化学计算化学
- 环境工程 环境工程
背景情况:
- 储水池岩石骨的纳米级表面粗度会影响二氧化碳 (CO2) 的地质封存.
- 这种影响背后的精确微观机制尚未完全理解.
研究的目的:
- 通过分子动力学模拟,研究纳米级粗度对二氧化碳在二氧化纳米孔中的行为的影响.
- 阐明受表面地形学影响的二氧化碳捕获和保留的微观机制.
主要方法:
- 纳秒分子动力学 (MD) 模拟使用纳孔模型.
- 水库表面被分为"纳米谷"和"纳米峰",纳米谷进一步被分为浅或深.
- 分析的重点是二氧化碳分子的捕获,扩散性,度,方向和纳米泡的形成.
主要成果:
- 纳米片比纳米皮更有效地捕捉二氧化碳分子,从而降低二氧化碳的扩散性和更高的局部度.
- 表面粗度增加通常会导致二氧化碳在山谷和山峰上积累更多.
- 较深的纳米谷表现出比较浅的更高的二氧化碳度,度随着粗而增加.
- 二氧化碳分子与纳米面平行吸附,而水分子显示随机方向.
- 二氧化碳纳米泡形成纳米谷,随着粗度的增加,它们变得越来越小,越来越多.
- 在双相系统中,纳米孔腔限制了CO2阶段,表明增强了CO2的保留.
结论:
- 纳米级表面粗度在地质封存过程中对二氧化碳的积累和保留起着至关重要的作用.
- 表面地形,特别是纳米谷,显著影响二氧化碳相位行为和储纳米孔内的移动性.
- 这些发现为优化二氧化碳地理封存策略提供了关键的分子层面见解.
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