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UP: Fachverband Umweltphysik
UP 4: Postersession
UP 4.9: Poster
Tuesday, February 26, 2013, 17:15–18:30, Poster EG
Influence of antifreeze proteins on the crystal growth in solidification of water — •Bernd Kutschan1, Silke Thoms2, Klaus Morawetz1,3,4, and Sibylle Gemming5 — 1Münster University of Applied Sciences, Stegerwaldstrasse 39, 48565 Steinfurt, Germany — 2Alfred Wegener Institut, Am Handelshafen 12, D-27570 Bremerhaven, Germany — 3International Institute of Physics (IIP), Avenida Odilon Gomes de Lima 1722, 59078-400 Natal, Brazil — 4Max-Planck-Institute for the Physics of Complex Systems, 01187 Dresden, Germany — 5Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf, P.O. Box 51 01 19, 01314 Dresden, Germany
Antifreeze proteins (AFPs) are surface-active molecules and inhibit the ice crystal growth during the freezing process. They interact with the diffuse water/ice interface and prevent a complete solidification by freezing. Microstructures evolve as a result of the phase separation in the presence of AFPs. The thermodynamics of pure water-ice phase transition is modified by the inhibitory effect of AFPs on ice formation as a kinetic phenomenon in non-equilibrium. Different hypotheses exist on the detailed mechanisms of the AFPs. Particularly with regard to the modification of the surface tension we are able to compute the interfacial energy from kink solutions. Connecting phase-field methods with reaction kinetics, the "adsorption-inhibition" theory of Langmuir seems to be suited to verify the microstructure formation in sea ice.