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Issue 24, 2014
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Magnetically induced structural anisotropy in binary colloidal gels and its effect on diffusion and pressure driven permeability

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Abstract

We report on the synthesis, microstructure and mass transport properties of a colloidal hydrogel self-assembled from a mixture of colloidal silica and nontronite clay plates at different particle concentrations. The gel-structure had uniaxial long-range anisotropy caused by alignment of the clay particles in a strong external magnetic field. After gelation the colloidal silica covered the clay particle network, fixing the orientation of the clay plates. Comparing gels with a clay concentration between 0 and 0.7 vol%, the magnetically oriented gels had a maximum water permeability and self-diffusion coefficient at 0.3 and 0.7 vol% clay, respectively. Hence the specific clay concentration resulting in the highest liquid flux was pressure dependent. This study gives new insight into the effect of anisotropy, particle concentration and bound water on mass transport properties in nano/microporous materials. Such findings merit consideration when designing porous composite materials for use in for example fuel cell, chromatography and membrane technology.

Graphical abstract: Magnetically induced structural anisotropy in binary colloidal gels and its effect on diffusion and pressure driven permeability

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Publication details

The article was received on 10 Feb 2014, accepted on 21 Mar 2014 and first published on 27 Mar 2014


Article type: Paper
DOI: 10.1039/C4SM00315B
Citation: Soft Matter, 2014,10, 4403-4412
  • Open access: Creative Commons BY license
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    Magnetically induced structural anisotropy in binary colloidal gels and its effect on diffusion and pressure driven permeability

    C. Abrahamsson, L. Nordstierna, J. Bergenholtz, A. Altskär and M. Nydén, Soft Matter, 2014, 10, 4403
    DOI: 10.1039/C4SM00315B

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