Magnetic Resonance Relaxometry (MRR) and Imaging (MRI) of water 1H nuclei, confined in high surface-to-volume ratio (S/V) systems, have been successfully applied, as non-destructive tools, to detect connected porosity and pore size distribution in different ceramic materials obtained by changing their composition or process conditions. MRI allows one to visualize the internal sections of ceramics in order to check spatial heterogeneity and MRR gives information on pore-size distribution. The Nuclear Magnetic Resonance (NMR) results are combined with those obtained by Scanning Electron Microscopy (SEM) and Mercury Intrusion Porosimetry (MIP). NMR and SEM results of low porosity ceramic samples, prepared by using different soaking times, show that the samples with longer soaking times have lower porosity and larger pores. The seeming discrepancy with MIP data can be explained by the fact that with increasing soaking times the interconnected porosity decreases and the pore size tends to increase, with reduced pore throats. For high porosity ceramic samples, SEM images show the presence of a network of plate-shaped pores with a size distribution well represented by MRR. In this case, the assumptions usually adopted to interpret MIP data in terms of pore sizes do not apply.

Water 1H NMR technique to analyse the porous structure of ceramics

GOMBIA, MIRKO;FANTAZZINI, PAOLA;RAMBALDI, ELISA;TIMELLINI, GIORGIO
2008

Abstract

Magnetic Resonance Relaxometry (MRR) and Imaging (MRI) of water 1H nuclei, confined in high surface-to-volume ratio (S/V) systems, have been successfully applied, as non-destructive tools, to detect connected porosity and pore size distribution in different ceramic materials obtained by changing their composition or process conditions. MRI allows one to visualize the internal sections of ceramics in order to check spatial heterogeneity and MRR gives information on pore-size distribution. The Nuclear Magnetic Resonance (NMR) results are combined with those obtained by Scanning Electron Microscopy (SEM) and Mercury Intrusion Porosimetry (MIP). NMR and SEM results of low porosity ceramic samples, prepared by using different soaking times, show that the samples with longer soaking times have lower porosity and larger pores. The seeming discrepancy with MIP data can be explained by the fact that with increasing soaking times the interconnected porosity decreases and the pore size tends to increase, with reduced pore throats. For high porosity ceramic samples, SEM images show the presence of a network of plate-shaped pores with a size distribution well represented by MRR. In this case, the assumptions usually adopted to interpret MIP data in terms of pore sizes do not apply.
M. Gombia; P. Fantazzini; E. Rambaldi; A. Tucci; L. Esposito; G. Timellini
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/52110
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