¹H NMR Sensor for Nondestructive Characterization of Organic and Inorganic Materials

Area of Science:

• Materials Science
• Analytical Chemistry
• Biophysics

Background:

• Nuclear magnetic resonance (NMR) relaxation is crucial for understanding molecular dynamics.
• Non-destructive monitoring of material properties is essential across various scientific fields.
• Existing NMR techniques often require complex setups and direct sample contact.

Purpose of the Study:

• To develop and evaluate a unilateral ¹H NMR sensor for non-destructive material characterization.
• To assess the sensor's capability for spatial profiling of T₂ lifetimes and signal intensities.
• To demonstrate the sensor's applicability to diverse sample types, including industrial and organic materials.

Main Methods:

• Development of a unilateral ¹H NMR sensor with a permanent magnet array and RF coil.
• Utilizing a linear displacement mechanism for precise spatial scanning of samples.
• Measuring T₂ lifetimes and signal intensities in eraser, cement paste, avocado, and beef steak samples.

Main Results:

• Achieved 1 mm spatial resolution, enabling detailed material profiling.
• Successfully differentiated materials based on T₂ lifetimes, including layered erasers and different cement types.
• Distinguished between components within organic samples (avocado peel/pulp, beef fat/meat) non-destructively.
• Experimental T₂ lifetimes correlated well with those from a commercial NMR spectrometer.

Conclusions:

• The developed unilateral ¹H NMR sensor is a versatile tool for non-destructive material analysis.
• The sensor provides high spatial resolution and can differentiate materials with subtle property variations.
• Its ability to analyze diverse samples non-destructively opens avenues for in-situ and field applications.