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Validity of NMR pore-size analysis of cultural heritage ancient building materials containing magnetic impurities (Articolo in rivista)

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Validity of NMR pore-size analysis of cultural heritage ancient building materials containing magnetic impurities (Articolo in rivista) (literal)

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Brai, M; Casieri, C; De Luca, F; Fantazzini, P; Gombia, M; Terenzi, C (2007)
Validity of NMR pore-size analysis of cultural heritage ancient building materials containing magnetic impurities
in Solid state nuclear magnetic resonance
(literal)

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Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy; Univ Palermo, Dipartimento Fis & Tecnol Relat, I-90128 Palermo, Italy; Univ Roma La Sapienza, Res Ctr, CNR, SOFT INFM, I-00185 Rome, Italy; Univ Aquila, Dipartimento Fis, I-67010 Coppito, Italy; Univ Bologna, Dipartmento Fis, I-40127 Bologna, Italy (literal)

Titolo

Validity of NMR pore-size analysis of cultural heritage ancient building materials containing magnetic impurities (literal)

Abstract

NMR relaxation time distributions, obtained with laboratory and portable devices, are utilized to characterize the pore-size distributions of building materials coming from the Roman remains of the Greek-Roman Theatre of Taormina. To validate the interpretation of relaxation data in terms of pore-size distribution, comparison of results from standard and in situ NMR experiments with results of the mercury intrusion porosimetry (MIP) has been made. Although the pore-size distributions can be obtained by NMR in terms of either longitudinal (T-1) or transverse (T-2) relaxation times distributions, the shorter duration of the T-2 measurement makes it, in principle, preferable, although the determination of T-2 distributions is not necessarily an easy alternative to finding T-1 distributions. Among other things, the T-2 distribution is almost independent of the inhomogeneity of the magnetic field, while the T-2 distribution is strongly influenced by it. This paper was aimed at answering two questions: what are the validity limits to interpret NMR data in terms of pore-size distributions and whether the portable device can successfully be applied as a non-destructive and non-invasive toot for in situ NMR analysis of building materials, particularly those of Cultural Heritage interest. (C) 2007 Elsevier Inc. All rights reserved. (literal)

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