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NMR study of the local magnetic field gradients in evoluting porous structures. An application to cement gels
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18.In the case of a nonexponential magnetization recovery curve, the average relaxation rate is found to be approximately the same for any of the frequently used distribution of relaxation rates in cement gels, such as the log-normal or the stretched exponential distribution function (Ref. 19). Thus selecting the log-normal distribution for fitting the distribution of relaxation rates actually has no effect on measuring the average LMFG. Besides, it has been previously found that the stretch exponential distribution fails to fit the long time magnetization relaxation, as opposed to the log-normal distribution that properly fits in all time scales (Ref. 19).
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22.Based on approximations used for the numerical simulation of LMFG inside pores, there is a similarity between the local magnetic fields and the static electric fields produced by a surface charge density (Ref. 24). It is thus expected that at edge points, like those of rough surfaces, LMFG should be much stronger than at smooth surface points (Refs. 8, 9). Since LMFG are mainly located in the vicinity of the pore surface, and in accordance with Sec. III, spin dephasing will mainly occur when molecules are located close to the pore surface.
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