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FP5

PORELEASE Informe resumido

Project ID: G5RD-CT-1999-00044
Financiado con arreglo a: FP5-GROWTH
País: United Kingdom

Method for measuring pore size in a bioceramic scaffold using gas permeability techniques

Typically, information on the pore size distribution in a sample is derived from such methods as image analysis. This can be time consuming and requires access to specialised equipment. In a structure containing more than one level of porosity these methods can lead to misleading results. Where the analyser fails to differentiate between macropores and the interconnections between them the data will be skewed to the smaller end of the spectrum.

An alternative method was therefore developed based on techniques commonly used by porous sintered metal filter manufacturers (ASTM F902). This gas permeability technique produces a dimension for the diameter of an equivalent cylindrical capillary based on an idealised approximation of the porous structure. By analysing SEM micrographs of a range of the samples produced by our foaming method, we were able to establish a relationship that accurately related the results of the gas permeability test to mean macropore size of our porous microstructures.

The advantages of this technique are that it is simple to set up and quick to perform. It is envisaged that the data produced by this test could be the basis of a quality control procedure allowing rapid verification and validation of the production process

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Contacto

John MERRY, (Research Scientist)
Tel.: +44-1142-348899
Fax: +44-1142-292901
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