Comparison between different presentations of pore size distribution in porous materials |
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Authors: | K Meyer and P Klobes |
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Institution: | (1) Federal Institute for Materials Research and Testing (BAM), D-12200 Berlin, Germany, DE |
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Abstract: | The different presentations of the pore size distribution derived from the gas adsorption method and the mercury porosimetry
are connected with some problems. This concerns especially the use of the logarithmically differential pore volume distribution.
The incorrect application of this distribution to bimodal pore systems involves the danger of an apparent overemphasizing
of larger pores. This effect may also occur using the incremental pore size distribution in case the experimental point spacing
considerably increases towards the larger pore radii. The pore volume density distribution defined as the linear derivative
of the cumulative pore volume curve with respect to the pore radius has been found the most convenient form among the various
kinds of pore volume distribution presentations. It has been shown that the direct comparison between this distribution and
the logarithmically differential pore volume distribution is not allowed. Nevertheless, there is a clear connection between
these definitions for the pore size distribution so that they are completely equivalent.
Received: 15 May 1998 / Revised: 8 October 1998 / Accepted: 10 October 1998 |
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