[seminar] Seminar Ziherl, HBFD & IRB

[Hrvoje Buljan]

Pos(tovani kolege, ljubazno sam zamoljen da podsjetim na danasnji seminar:


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*ZAJEDNIC(KI SEMINAR***

*c(etvrtak, 13.03.2014., 14:30 sati*

Institut Ru?er Bos(kovic', Bijenic(ka cesta 54, predavaonica I krilo

*Primoz( Ziherl*

Faculty of Mathematics and Physics, University of Ljubljana

and Joz(ef Stefan Institute, Ljubljana**

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*Quasicrystalline order in soft-matter systems**//*

Over the past decade, quasicrystalline order has been observed in many 
soft-matter systems: in dendritic micelles, in star and tetra block 
terpolymer melts and in diblock copolymer and surfactant micelles. The 
formation of quasicrystal from such a broad range of 'soft' 
macromolecular micelles suggests that they assemble by a generic 
mechanism rather than being dependent on the specific chemistry of each 
system. Indeed, micellar softness has been postulated and shown to lead 
to quasicrystalline order. We theoretically explore this link by 
studying two-dimensional hard disks decorated with steplike 
square-shoulder repulsion that mimics, for example, the soft alkyl shell 
around the aromatic core in dendritic micelles.We find a family of 
quasicrystals with 10-, 12-, 18- and 24-fold bond orientational order 
which originate from mosaics of equilateral and isosceles triangles 
formed by particles arranged core-to-core and shoulder-to-shoulder. The 
pair interaction responsible for these phases highlights the role of 
local packing geometry in generating quasicrystallinity in soft matter, 
complementing the principles that lead to quasicrystal formation in hard 
tetrahedra. Based on simple interparticle potentials, quasicrystalline 
mosaics may well find use in diverse applications ranging from improved 
image reproduction to advanced photonics materials.

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Primo¾ Ziherl bavi se teorijskom fizikom meke tvari i teorijskom 
biofizikom. Izvanredni je profesor na Sveu¹ili¹tu u Ljubljani, a radi i 
na Institutu Jo¾ef Stefan. Objavio je pedesetak znanstvenih radova u 
meðunarodnim èasopisima koji su citirani preko 800 puta. Èlan je 
uredni¹tva èasopisa Physical Review E. Dobitnik je mno¹tva nagrada, 
ukljuèujuæi i /"Outstanding Referee"/ Amerièkog fizikalnog dru¹tva 
(2008. godine). Upravo je objavio rad /"Mosaic two-lengthscale 
quasicrystals"/ koji æe biti okosnica njegovog predavanja.

[1] T. Dotera, T. Oshiro, and P. Ziherl, Nature 506, 208--211(2014)

http://www-f1.ijs.si/~ziherl/ <http://www-f1.ijs.si/%7Eziherl/>






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