Pore size distribution calculation from 1H NMR signal and N 2 adsorption-desorption techniques

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The pore size distribution (PSD) of nano-material MCM-41 is determined using two different approaches: N 2 adsorption-desorption and 1H NMR signal of water confined in silica nano-pores of MCM-41. The first approach is based on the recently modified Kelvin equation [J.V. Rocha, D. Barrera, K. Sapag, Top. Catal. 54(2011) 121-134] which deals with the known underestimation in pore size distribution for the mesoporous materials such as MCM-41 by introducing a correction factor to the classical Kelvin equation. The second method employs the Gibbs-Thompson equation, using NMR, for melting point depression of liquid in confined geometries. The result shows that both approaches give similar pore size distribution to some extent, and also the NMR technique can be considered as an alternative direct method to obtain quantitative results especially for mesoporous materials. The pore diameter estimated for the nano-material used in this study was about 35 and 38 Å for the modified Kelvin and NMR methods respectively. A comparison between these methods and the classical Kelvin equation is also presented.

Original languageBritish English
Pages (from-to)3797-3801
Number of pages5
JournalPhysica B: Condensed Matter
Issue number18
StatePublished - 15 Sep 2012


  • Kelvin equation
  • MCM-41
  • Nitrogen absorption-desorption
  • NMR
  • Pore size distribution


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