SAXS reveals the magnetic alignment pathway of the goethite columnar liquid crystal phase

[Display omitted] •A magnetic field was used to reorient a goethite columnar liquid crystal.•SAXS was used to reveal the reorientation dynamics.•Realignment proceeds via collective rotation of columnar domains.•Induced microscopic local shear makes layers of particles slide over each other. The alig...

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Bibliographic Details
Published in:Journal of colloid and interface science 2014-08, Vol.428 (428), p.316-320
Main Authors: Leferink op Reinink, Anke B.G.M., van den Pol, Esther, Vroege, Gert Jan, Petukhov, Andrei V.
Format: Article
Language:English
Subjects:
Alignment
Colloids
Condensed matter: structure, mechanical and thermal properties
Exact sciences and technology
Goethite board-like colloids
Liquid crystals
Lyotropic columnar liquid crystal
Magnetic field
Magnetic fields
Nanostructure
Pathways
Physics
Reflection
Reorientation dynamics
SAXS
Structure of solids and liquids
crystallography
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Summary:[Display omitted] •A magnetic field was used to reorient a goethite columnar liquid crystal.•SAXS was used to reveal the reorientation dynamics.•Realignment proceeds via collective rotation of columnar domains.•Induced microscopic local shear makes layers of particles slide over each other. The alignment of board-like colloidal goethite particles in the dense rectangular centred columnar liquid crystal phase in an external magnetic field is studied using small angle X-ray scattering (SAXS). Transient SAXS-patterns show broadening of the columnar reflections in specific directions. While the reflections along the field stay at a constant Q-value, the other reflections do not. These results imply a certain pathway of reorientation. It appears that alignment proceeds via collective rotation of domains inducing ‘nanoshear’ between the layers of particles, which slide over each other. The results support the recently suggested martensitic transition pathway for the simple and centred rectangular columnar phases, which were found to spontaneously transform into each other in another goethite system. The results also provide a fine example of how SAXS can be used to study reorientation behaviour of liquid crystals at the nanoscale.
ISSN:0021-9797
1095-7103
DOI:10.1016/j.jcis.2014.04.061