Magnetic orientation of nontronite clay in aqueous dispersions and its effect on water diffusion
Artikel i vetenskaplig tidskrift, 2015

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.

Magnetic alignment

Nontronite clay

Diffusion

Diffusion NMR

Exfoliated clay

Permeability

NMR 1D imaging

Anisotropic microstructure

Bound water

Författare

Christoffer Abrahamsson

Chalmers, Kemi och kemiteknik, Tillämpad kemi, Teknisk ytkemi

SuMo Biomaterials

Lars Nordstierna

Chalmers, Kemi och kemiteknik, Tillämpad kemi, Teknisk ytkemi

Matias Nordin

Deutsches Krebsforschungszentrum (DKFZ)

S. V. Dvinskikh

Saint Petersburg State University - Spsu

Kungliga Tekniska Högskolan (KTH)

Magnus Nydén

University of South Australia

Journal of Colloid and Interface Science

0021-9797 (ISSN)

Vol. 437 205-210

Ämneskategorier

Fysikalisk kemi

DOI

10.1016/j.jcis.2014.09.031

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Senast uppdaterat

2018-09-06