1H NMR spin-spin relaxation and imaging in porous systems: an application to the morphological study of white portland cement during hydration in the presence of organics

Magnetic Resonance Imaging
M GussoniL Zetta

Abstract

Proton nuclear magnetic resonance (NMR) spin-spin relaxation and imaging have been applied to investigate white Portland cement pastes during hydration in the absence and in the presence of organic solvents. The main organic solvent investigated was methanol, alone or together with the organic waste 2-chloroaniline (2-CA), an aromatic amine representative of an important class of highly toxic compounds. For all the analysed samples, prepared with a solvent-to-cement ratio of 0.4, the decay of the echo magnetization has been fitted by adopting a model that combines an exponential component with a gaussian one. The calculated independent relaxation parameters have been discussed in terms of morphological and dynamical changes that occur during the cement hardening process and pore formation. Three kinds of water molecules: "solid-like" (chemically and physically bound), "liquid-like" (porous trapped) and "free" water, endowed with anisotropic, near isotropic and isotropic motion, respectively, were identified. Spin-echo images collected on the same samples during the hydration kinetics, allowed the changes of water and solvents spatial distribution in the porous network to be monitored, showing percolation phenomena and confirmin...Continue Reading

References

Jul 1, 1996·Solid State Nuclear Magnetic Resonance·W KuhnR Müller
Nov 6, 1998·Magnetic Resonance Imaging·A J BohrisB Le Page
Jul 11, 2001·Magnetic Resonance Imaging·A PlassaisJ P Korb
Jul 10, 2003·Magnetic Resonance Imaging·A PlassaisF Barberon

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Citations

Aug 28, 2013·Journal of Hazardous Materials·Guangji HuGuangming Zeng
Apr 25, 2002·Annual Review of Physical Chemistry·John T Fourkas
Oct 5, 2013·The Journal of Chemical Physics·Konstantin E DorfmanShaul Mukamel
May 28, 2005·The Journal of Chemical Physics·Yong He, Eli Barkai
Jun 21, 2008·Magnetic Resonance Imaging·Paméla F Faure, Stéphane Rodts
Jun 3, 2008·Journal of Hazardous Materials·Paola Gallo StampinoRenato Pelosato
May 1, 2007·Journal of Hazardous Materials·Athanasios K Karamalidis, Evangelos A Voudrias
Feb 18, 2006·Journal of Magnetic Resonance·D S Grebenkov
Oct 11, 2014·Magnetic Resonance in Chemistry : MRC·C BuchmannG E Schaumann
Nov 21, 2020·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·George DiamantopoulosJamal Hassan

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