Direct observation of twist mode in electroconvection in I52

Details Direct observation of twist mode in electroconvection in I52 Direct observation of twist mode in electroconvection in I52

2000-03-31

arxiv.org/abs/cond-mat/0003515v2

Phys. Rev. E v 62 p. 6780 (2000)

Physics

Condensed Matter

Soft Condensed Matter

Scientific paper

10.1103/PhysRevE.62.6780

I report on the direct observation of a uniform twist mode of the director field in electroconvection in I52. Recent theoretical work suggests that such a uniform twist mode of the director field is responsible for a number of secondary bifurcations in both electroconvection and thermal convection in nematics. I show here evidence that the proposed mechanisms are consistent with being the source of the previously reported SO2 state of electroconvection in I52. The same mechanisms also contribute to a tertiary Hopf bifurcation that I observe in electroconvection in I52. There are quantitative differences between the experiment and calculations that only include the twist mode. These differences suggest that a complete description must include effects described by the weak-electrolyte model of electroconvection.

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