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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 20: Complex Fluids and Soft Matter 2 (joint session DY/CPP)

CPP 20.2: Talk

Wednesday, March 24, 2021, 11:20–11:40, DYa

Phase Field Crystal Model of patchy colloids in two dimensions — •Robert F. B. Weigel and Michael Schmiedeberg — Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany

Motivated by our recent simulation studies of quasicrystals that occur in systems of patchy colloids [1,2], we develop a Phase Field Crystal Model for such particles. We consider two-dimensional patchy colloids with symmetrically placed attractive sites on their surface, such that they interact with preferred binding angles. We construct a free energy functional that is similar to the free energy used for liquid crystals [3], but obeys the symmetry of the patchy colloids. The functional depends on both a density field and an orientation field. Free numerical minimization of the free energy yields a rich phase behavior of complex structures.

[1] Gemeinhardt et al., Eur. Phys. J. E 41, 126 (2018).

[2] Gemeinhardt et al., EPL 126, 38001 (2019).

[3] Achim et al., Phys. Rev. E 83, 061712 (2011).