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Dispersions of plate-like colloidal particles: Cubatic order?
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Physical and Analytical Chemistry, Physical Chemistry.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Physics.
2010 (English)In: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 348, no 1, 80-84 p.Article in journal (Refereed) Published
Abstract [en]

Experimental evidence for the existence of 'cubatic' order in a colloidal dispersion of plate-like particles is presented. In a 'cubatic' phase, disk-like particles self-assemble with domains of a few parallel plates and the director tends to be orthogonal in adjacent domains. This phase has been predicted previously by computer simulation. The domains are approximately equiaxial and are predicted to exist only within a limited range of aspect ratios and volume fractions. This locally ordered structure cannot be identified readily using scattering techniques, since the patterns are expected to be similar to those of isotropic liquid phases. For this reason, we have used a real-space technique of cryo-transmission electron microscopy that directly probes such locally ordered structures to study dispersions of nickel hydroxide particles. Polydispersity of particle size is expected to require some local tilting in order to include larger particles in a dense structure and this is discussed with respect to the concentration range for which cubatic order is observed. This new structure offers the possibility of novel materials that could be prepared by self-assembly and have applications in a wide range of fields.

Place, publisher, year, edition, pages
2010. Vol. 348, no 1, 80-84 p.
Keyword [en]
Cubatic structure, Plate-like colloids, Cryo-transmission electron microscopy
National Category
Physical Sciences Chemical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-126552DOI: 10.1016/j.jcis.2010.04.033ISI: 000278924600010PubMedID: 20466379OAI: oai:DiVA.org:uu-126552DiVA: diva2:324783
Available from: 2010-06-16 Created: 2010-06-16 Last updated: 2011-03-31Bibliographically approved

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Qazi, S. Junaid S.Karlsson, GöranRennie, Adrian R.

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