Journal
MAGNETIC RESONANCE IN CHEMISTRY
Volume 57, Issue 10, Pages 829-835Publisher
WILEY
DOI: 10.1002/mrc.4819
Keywords
carbon xerogel; diffusion; fast field cycling; fractal dimension; NMR relaxation; porous media; tortuosity
Funding
- Romanian National Authority for Scientific Research, CNCS-UEFISCDI [PN-III-P2-2.1-PED-2016-0719] Funding Source: Medline
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Low-field nuclear magnetic resonance techniques are employed to extract information about the effects introduced by the interaction with the surface on the rotational and translational dynamics of molecules confined inside a mesoporous carbon xerogel. The molecules under study were water, cyclohexane, and hexane. They were chosen due to their different interaction strength with the carbonaceous matrix. Frequency dependent longitudinal relaxation measurements, using the fast field cycling technique, allowed extraction of the fractal dimension of the carbon xerogel surface. It was observed that the measured value is influenced by the molecule affinity to the surface. Diffusion measurements, using the pulse field gradient technique, have revealed that the stronger interaction with the surface of cyclohexane and hexane molecules leads to an increased diffusive tortuosity, as compared with water.
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