Montmorillonite alignment induced by magnetic field: evidence based on the diffusion anisotropy of water molecules

Journal of Colloid and Interface Science
Takafumi TakahashiYasuhisa Ikeda

Abstract

Diffusion coefficients of water in Na-montmorillonite (Na-mon) suspensions have been determined by pulsed-field gradient spin-echo (PGSE) NMR spectroscopy for three directions (x, y, and z), where x and y mean the directions perpendicular to the static magnetic field, and z the direction parallel to it. Diffusion anisotropy was observed in the suspensions with Na-mon weight fractions of 0.63, 1.82, and 3.32%; i.e., the diffusivity of water in the z direction is faster than that in the x or y direction. The largest diffusion anisotropy of water was observed at the Na-mon fraction of 3.32%. However, diffusion anisotropy disappeared in the suspensions with Na-mon fraction more than 5.02%. The fast diffusivity in the z direction was slightly enhanced in a stronger static magnetic field (14.1 T). These results indicate that the platelike Na-mon particles are aligned with their platelike faces parallel to the static magnetic field of NMR. We also measured diffusion coefficients of water for the z direction in the temperature range from 24 to 85 degrees C. The plot of diffusion coefficients of water against reciprocal temperature showed a refraction point at 65 degrees C. This phenomenon explicitly means that the alignment is graduall...Continue Reading

References

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Citations

Feb 24, 2009·Journal of Magnetic Resonance·S V DvinskikhI Furó
Oct 15, 2014·Journal of Colloid and Interface Science·Christoffer AbrahamssonMagnus Nydén
Nov 1, 2012·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Triati Dewi Kencana WunguHideaki Kasai
Jul 9, 2020·Polymers·Masafumi Yamato, Tsunehisa Kimura
Dec 17, 2008·Langmuir : the ACS Journal of Surfaces and Colloids·Eduardo N de Azevedo, M Engelsberg
Jan 6, 2010·Langmuir : the ACS Journal of Surfaces and Colloids·Patrice PorionAlfred Delville
Mar 23, 2007·Langmuir : the ACS Journal of Surfaces and Colloids·E N de AzevedoR E de Souza

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