[Zurück]

S. Wagner, E. G. Noya, G. Kahl:
"Transitions between ordered and disordered phases of patchy particles in two dimensions";
Poster: 10th Liquid Matter Conference (2017), Ljubljana; 17.07.2017 - 21.07.2017.

We consider a two dimensional ensemble of patchy particles that carry one patch: while
the particles are impenetrable we assume for the patch-patch interaction a Kern-Frenkel
type potential [1]. We fix the density to close packing conditions; thus particles form a
hexagonal lattice and we are left with the orientational degrees of freedom. Investiga-
tions on the system have been carried out with standard Monte Carlo simulations, with
ensemble sizes ranging up to 83 000 particles.
We have first analysed the bonding patterns that these particles are able to form at van-
ishing temperature (see also [2]). Depending on the opening angle of the patch we have
identified in total seven characteristic bonding patterns and have classified them in terms
of regular tilings, formed by the connecting lines of bonding particles. We have then in-
creased the temperature systematically for the one- and the two-bond cases and have
investigated how the orientational order of the ground state configuration changes upon
the temperature change. In an effort to quantify the findings of these investigations we
have introduced suitable order parameters.

patchy particles, two dimensions, orientational order, Monte Carlo simulations

http://publik.tuwien.ac.at/files/publik_265134.pdf