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Magnetic orientation of nontronite clay in aqueous dispersions and its effect on water diffusion

Christoffer Abrahamsson (Institutionen för kemi och kemiteknik, Teknisk ytkemi ; SuMo Biomaterials) ; Lars Nordstierna (Institutionen för kemi och kemiteknik, Teknisk ytkemi) ; M. Nordin ; S. V. Dvinskikh ; M. Nyden
Journal of Colloid and Interface Science (0021-9797). Vol. 437 (2015), p. 205-210.
[Artikel, refereegranskad vetenskaplig]

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 to the magnetic field, directional self-diffusion anisotropy can be created within such dispersion. Here we study water diffusion in exfoliated nontronite clay dispersions by diffusion NMR and time-dependant 1H-NMR-imaging profiles. The dispersion clay concentration was varied between 0.3 and 0.7 vol%. After magnetic alignment of the clay particles in these dispersions a maximum difference of 20% was measured between the parallel and perpendicular self-diffusion coefficients in the dispersion with 0.7 vol% clay. A method was developed to measure water diffusion within the dispersion in the absence of a magnetic field (random clay orientation) as this is not possible with standard diffusion NMR. However, no significant difference in self-diffusion coefficient between random and aligned dispersions could be observed.

Nyckelord: Nontronite clay; Magnetic alignment; Exfoliated clay; Anisotropic microstructure; Diffusion; Permeability; Bound water; NMR 1D imaging; Diffusion NMR

Denna post skapades 2014-12-22. Senast ändrad 2016-03-21.
CPL Pubid: 208872


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Institutioner (Chalmers)

Institutionen för kemi och kemiteknik, Teknisk ytkemi
SuMo Biomaterials


Fysikalisk kemi

Chalmers infrastruktur