Berlin 2005 – wissenschaftliches Programm

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DY: Dynamik und Statistische Physik

DY 34: Poster

DY 34.61: Poster

Montag, 7. März 2005, 15:30–18:00, Poster TU D

Structural and elastic properties of two-dimensional model colloidal crystals: Monte-Carlo Simulations — •Kerstin Franzrahe and Peter Nielaba — Department of Physics, University of Konstanz, 78457 Konstanz, Germany

Structural and elastic properties of solids are of great interest for the design of soft materials. Monte-Carlo simulations are an effective means for a systematic analysis of these properties. Our main interest is in the behaviour of two-dimensional model colloidal crystals. As a model system we chose the hard disk system. Structural insight can be gained by finite-size-scaling analysis of suitable order parameters, while elastic properties can be studied using so called ’fluctuation’ methods. We implemented a method by S. Sengupta et.al [1], which enables us to extract the elastic constants of the infinite system from microscopic fluctuations of the Lagrangian strain tensor є_ij by making use of a block analysis procedure. The elastic constants of binary mixtures were thus determined via simulations in the NVT ensemble. Simulations in the NPT ensemble were done in order to analyse lattice formation in binary mixtures. In addition we analysed the influence of quenched impurities on the elastic properties of a mono-disperse hard disk system [2].

[1] S. Sengupta, P. Nielaba, M. Rao, K. Binder Phys. Rev. E 61,1072 (2000)

[2] P. Nielaba, K. Binder, D. Chaudhuri, K. Franzrahe, P. Henseler, A. Ricci, S. Sengupta, W. Strepp, J. Phys.: Condens. Matter 16 (2004) S4115-S4136