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Ultra Fast Imaging NMR method for measuring fast transport processes in thin porous media
R J K Nicasy1, H P Huinink2, S J F Erich3
1Eindhoven University of Technology, Applied Physics Department, P.O. Box 513, Eindhoven, 5600 MB, the Netherlands; Transport in Permeable Media group, Department of Applied Physics, Eindhoven University of Technology, PO Box 513, Eindhoven 5600 MB, the Netherlands.
Ultra Fast Imaging Nuclear Magnetic Resonance (UFI NMR) measures moisture in porous media with high resolution. This technique accurately tracks moisture uptake and penetration dynamics in materials like PVDF membranes.
Area of Science:
- Materials Science
- Physics
- Chemical Engineering
Background:
- Measuring dynamic moisture transport in thin porous media is difficult.
- Existing methods lack the necessary temporal and spatial resolution.
Purpose of the Study:
- Introduce Ultra Fast Imaging Nuclear Magnetic Resonance (UFI NMR) as a novel technique.
- Demonstrate UFI NMR's capability for high-resolution moisture distribution analysis.
- Validate UFI NMR against established methods.
Main Methods:
- Utilized UFI NMR with millisecond temporal and micrometer spatial resolution.
- Investigated T1 and T2 relaxation times for optimal signal-to-noise ratio.
- Employed contrast agents (CuSO4, Clariscan) to enhance measurements.
- Performed capillary penetration experiments on porous PVDF membranes.
Main Results:
- Established optimal relaxation time conditions for UFI NMR.
- Linked signal intensity to moisture content in water-based liquids.
- Successfully measured moisture profiles during capillary penetration in PVDF.
- Observed linear time behavior of moisture front positions in PVDF.
- Achieved comparable results to scanning absorptometry (ASA).
Conclusions:
- UFI NMR is a powerful tool for studying fast moisture transport in porous media.
- The technique provides detailed insights into moisture uptake and penetration dynamics.
- UFI NMR offers a viable alternative to existing measurement techniques.
