Prof. Tomonari Dotera: Quasicrystalline and Archimedean Phases in Polymeric Alloys

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Povzetek:

   Quasicrystalline and Archimedean Phases in Polymeric Alloys

   Prof. Tomonari Dotera, Department of Physics, Kinki University, Osaka, Japan

Tilings and patterns are known not only to mathematicians and crystallographers, but also to designers and visual artists as the basis of decorative art appearing on furniture, curtains, wall papers, kilts, ceramics, ties, etc. In this talk, we show that star-polymers can produce elegant self-assembled periodic and quasiperiodic patterns without fabrication technique. We have been creating several complex but periodic patterns known as antique Archimedean tiling patterns, and finally, we have found evidence of a "polymeric quasicrystal" tiling for the first time in simulations and experiments. Quasicrystals are the avant-garde structures that have noncrystallographic symmetry, and initiated a revolution of crystallography and solid-state physics in 1980's.

Remarkably, our polymeric dodecagonal quasicrystal has a hundred times length-scale compared to metallic systems, and thus it approaches the scale of visible light, where a promising photonic application has been considered. The present result indicates the universality of quasicrystalline order from atoms to polymers.

[1] K. Hayashida, et al. Phys. Rev. Lett. 98, (2007) 195502.
[2] K. Ueda, et al., Phys. Rev. B 75 (2007) 195122.
[3] T. Dotera, and T. Gemma, Phil. Mag. 86 (2006) 1085; ibid. 88 (2008) 2245.