Pore size distribution in mesoporous materials as studied by 1H NMR

Literature Information

Publication Date 2001-07-11
DOI 10.1039/B103228N
Impact Factor 3.676
Authors

D. W. Aksnes, K. Førland, L. Kimtys


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Abstract

The pore size distributions of six mesoporous silica materials were determined by measuring the 1H NMR signal from the non-frozen fraction of confined acetonitrile as a function of temperature. The average pore size distributions determined by NMR agree fairly well with those obtained by N2 sorption measurements. However, NMR gives a more detailed picture of the pore size distribution revealing three well-defined peaks. The peak at the lower pore size, however, reflects the surface layer rather than a real pore size distribution. The NMR method to determine pore dimensions in the mesoporous range has a potential to become an alternative approach to the conventional gas sorption technique. In practise, however, pore sizes larger than approximately 400 Å in diameter will be difficult to determine accurately due to the inverse dependence between the freezing point depression of the confined liquid and the pore diameter.

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Physical Chemistry Chemical Physics
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