[institut] Danas SCL seminar: Rene Messina, 22. maj, 14:00

[Igor Stankovic]

Postovane koleginice i kolege,

Pozivam vas da u sredu, 22. maja 2013. godine dodjete na SCL seminar 
koji ce sa pocetkom u 14 casova u citaonici odrzati prof. dr Rene 
Messina, University of Lorraine, Metz, Francuska. Naziv seminara je

Crystallization of binary mixtures in two dimensions

Abstract:

It is well known from solid state studies that strongly confined (i.e., 
quasi two-dimensional or even one-dimensional) systems exhibit 
properties and a phase behavior that may drastically differ from those 
in the bulk. Such features are also vivid in colloidal systems, and 
those materials represent ideal model systems to analyze (experimentally 
as well as theoretically) and understand confinement effects on the 
mesoscopic scale corresponding to the inter-particle distance. Whereas 
one-component strongly repulsive colloidal particles lead to a 
triangular lattice, the binary mixture counterpart provides a very rich 
phase behavior.

Two-dimensional crystallization can be experimentally realized for 
magnetic particles confined at the air-water interface under a strong 
external magnetic field. In the first part of the seminar, I will 
summarize recent progress achieved in the understanding of freezing for 
two dimensional dipolar mixtures. Equilibrium and non-equilibrium 
aspects are discussed.

Results concerning the crystallization of ionic mixtures in two- 
dimensions will be presented as well. Upon varying the size ratio, the 
stable two-dimensional crystalline lattices consist of square, 
triangular and rhombic crystals as well as a ion pair gas and a gas of 
one-dimensional crystalline chains. Thereby, we confirm the square 
structure, found experimentally on charged granulates, and predict new 
phases detectable in experiments on granular and colloidal matter.

Srdacan pozdrav,

Igor Stankovic