NMR of water in biological systems |
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Authors: | L Borghi A De Ambrosis S Aldrovandi M Villa |
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Institution: | 1. Istituto di Fisica ?A. Volta?, Via Bassi 6, 27100, Pavia, Italia 2. Gruppo Nazionale di Struttura della Materia del C.N.R., Via Bassi 6, 27100, Pavia, Italia
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Abstract: | Summary A simple relationship has been thought to exist between the dynamics of water in heterogeneous (liquid-solid) systems and
the NMR response. This relationship is usually expressed by the Bloembergen-Purcell-Pound (BPP) equations for relaxation and
the phase model. However, a requirement for the use of the BPP theory is that motions take place in an isotropic, infinite
and three-dimensional space. It is shown that the mere presence of solid surfaces causes the appearance of solidlike features
in the NMR response of the liquid even if its dynamics is directly affected by the surfaces. Some of these ?topological? or
?indirect? surface effects are of the same kind as the low-dimensionality effects. Their order of magnitude is estimated for
simple geometries and by treating the liquid motion in a hydrodynamic approximation. Comparison with the experiment is carried
on in a companion paper.
To speed up publication, the authors of this paper have agreed to not receive the proofs for correction. |
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Keywords: | Nuclear magnetic resonance and relaxations |
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