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Surface influence on the rotational and translational dynamics of molecules confined inside a mesoporous carbon xerogel
Author(s) -
Cadar Calin,
Ardelean Ioan
Publication year - 2019
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/mrc.4819
Subject(s) - chemistry , molecule , cyclohexane , pulsed field gradient , chemical physics , mesoporous material , relaxation (psychology) , carbon fibers , diffusion , rotational diffusion , molecular dynamics , analytical chemistry (journal) , computational chemistry , organic chemistry , composite material , thermodynamics , catalysis , materials science , psychology , social psychology , physics , composite number
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.