Magnetic orientation of nontronite clay in aqueous dispersions and its effect on water diffusion
Date
2014
Authors
Abrahamsson, C.
Nordstierna, L.
Nordin, M.
Dvinskikh, S.V.
Nyden, M.
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Journal of Colloid and Interface Science, 2014; 437:205-210
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Abstract
The diffusion rate of water in dilute clay dispersions depends on particle concentration, size, shape,aggregation and water-particle interactions. As nontronite clay particles magnetically align parallel tothe magnetic field, directional self-diffusion anisotropy can be created within such dispersion. Here westudy water diffusion in exfoliated nontronite clay dispersions by diffusion NMR and time-dependant1H-NMR-imaging profiles. The dispersion clay concentration was varied between 0.3 and 0.7 vol%. Aftermagnetic alignment of the clay particles in these dispersions a maximum difference of 20% was measuredbetween the parallel and perpendicular self-diffusion coefficients in the dispersion with 0.7 vol% clay. Amethod was developed to measure water diffusion within the dispersion in the absence of a magneticfield (random clay orientation) as this is not possible with standard diffusion NMR. However, no significantdifference in self-diffusion coefficient between random and aligned dispersions could be observed.
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Copyright 2014 Elsevier