Volume 34, Number 7, June I 1996
|Page(s)||483 - 488|
|Published online||01 September 2002|
NMR evidence of anomalous molecular diffusion due to structural confinement
Universität Leipzig, Fakultät für Physik und Geowissenschaften
Linnéstraße 5, D-04103 Leipzig, Germany
2 Universität Dortmund, Fachbereich Physik, PF 500 500, D-44221 Dortmund, Germany
Accepted: 10 April 1996
Using the field gradient NMR technique, anomalous molecular diffusion in a porous host matrix of polypropylene could be followed over a substantial range of observation times. The experimentally determined time exponents of anomalous diffusion are found to decrease with decreasing pore filling factors, indicating an enhancement of molecular confinement. For sufficiently large observation times normal diffusion is observed and the effect of confinement results in a mere reduction of the effective diffusivity, which is independent of the given molecular species.
PACS: 05.40.+j – Fluctuation phenomena, random processes, and Brownian motion / 47.53.+n – Fractals / 68.35.Fx – Diffusion; interface formation
© EDP Sciences, 1996
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