from the conferences organized by TANGER Ltd. provisional website
The 1H Nuclear Magnetic Resonance Relaxometry has been used for studying properties of various porous materials. T1 and T2 relaxation times in such systems are influenced by the molecule confinement and T1/T2 ratio can reflect an interaction strength between an adsorbate molecules and an adsorbent surface. In this paper 1D relaxation times distributions and 2D T1-T2 maps from NMR measurements at magnetic field of 0.05 T are shown. Two mesoporous silica materials: MCM-41 and SBA-15 are studied at different water saturation states. Signals from hydroxyl groups, water confined in pores and bulk water are distinguished. Higher T1/T2 is measured for SBA-15 than for MCM-41 and the increase of T1/T2 ratio for the samples with lower amount of water is observed. Relaxation parameters for other porous systems such as exemplary geological samples in different saturation states and for biological samples are also compared.Keywords: Low field NMR, MCM-41, SBA-15, porous materials, T1/T2 ratio
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