使用微拉曼光谱测量对纳米通道中的流体扩散动力学的研究
Jingyu Chen1, Haowei Lu1, Kecheng Zeng1,2
1Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, People's Republic of China. ruinaxu@mail.tsinghua.edu.cn.
Lab on a chip
|August 21, 2025
概括
一种新的度衰变方法使用纳米流体和拉曼光谱来研究纳米通道中的流体扩散. 这种方法表明页岩纳米通道中的油扩散遵循菲克定律,不受孔壁的影响.
科学领域:
- 纳米技术
- 物理化学
- 材料科学
背景情况:
- 纳米孔中的液体扩散对于能源应用至关重要.
- 由于孔隙复杂性和测量挑战,现有的方法难以准确地测量纳米通道中的扩散.
- 了解流体壁相互作用是优化纳米孔扩散的关键.
研究的目的:
- 开发和验证一种用于研究纳米通道中的流体扩散动力学的新方法.
- 在页岩纳米通道中量化油混合物的扩散系数.
- 评估毛孔大小和温度对扩散的影响.
主要方法:
- 开发了一种结合纳米流体和微观拉曼光谱的度衰变方法.
- 使用"通道-通道-细胞"芯片设计进行实时度检测.
- 使用自制的温度控制模块进行精确的温度调节 (295383 K).
主要成果:
- 证明了纳米通道 (21173纳米深度) 中的油气扩散符合菲克的扩散定律.
- 即使在狭窄的道中,也没有观察到与散装阶段的扩散系数的显著偏差.
- 通过一致的实验结果验证了度衰变方法的可靠性.
结论:
- 度衰变方法准确地测量纳米通道中的扩散系数.
- 液体壁相互作用似乎对研究的纳米通道中的油扩散动力学有微不足道的影响.
- 该方法为纳米孔扩散的进一步研究提供了有前途的应用.
相关概念视频
01:26Raman Spectroscopy Instrumentation: Overview
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A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...
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01:20Raman Spectroscopy: Overview
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The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
However, a small fraction of the scattered light exhibits a frequency shift due to the exchange of energy between the incident photons and...
However, a small fraction of the scattered light exhibits a frequency shift due to the exchange of energy between the incident photons and...
598