Shear alignment and orientational order of macroscopic rodlike grains

R. Stannarius, S. Wegner, B. Szaboó, T. Börzsönyi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

This contribution establishes a link between very different soft matter systems that exhibit orientational order. Granular matter research has been focused so far mainly on ensembles of spherical or irregularly shaped grains. Recently, several studies of anisometric particles have been reported, but still, many phenomena in such materials are little understood. Quantitative experiments are scarce. We report shear experiments with macroscopic shape-anisotropic particles [Börzsönyi et al., Phys. Rev. Lett., 108, 228302 (2012)] and discuss induced orientational order and alignment. Optical observations of the top layer are accompanied by X-ray computed tomography [Wegner et al., Soft Matter, in press (2012)], where positions and orientations of each individual grain in the bulk can be resolved. We establish quantitative relations between shear alignment and aspect ratio. The induced orientational order influences local packing and other macroscopic properties like the shear resistance. A comparison is drawn with molecular liquid crystals (LC). Many observations are qualitatively and even quantitatively comparable to the well-understood nematic phase of rodlike molecules, even though the types of interactions are completely different.

Original languageEnglish
Title of host publicationPowders and Grains 2013 - Proceedings of the 7th International Conference on Micromechanics of Granular Media
Pages74-77
Number of pages4
DOIs
Publication statusPublished - Aug 1 2013
Event7th International Conference on Micromechanics of Granular Media: Powders and Grains 2013 - Sydney, NSW, Australia
Duration: Jul 8 2013Jul 12 2013

Publication series

NameAIP Conference Proceedings
Volume1542
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Other

Other7th International Conference on Micromechanics of Granular Media: Powders and Grains 2013
CountryAustralia
CitySydney, NSW
Period7/8/137/12/13

Keywords

  • flow alignment
  • granular flow
  • orientational order

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Stannarius, R., Wegner, S., Szaboó, B., & Börzsönyi, T. (2013). Shear alignment and orientational order of macroscopic rodlike grains. In Powders and Grains 2013 - Proceedings of the 7th International Conference on Micromechanics of Granular Media (pp. 74-77). (AIP Conference Proceedings; Vol. 1542). https://doi.org/10.1063/1.4811870