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Phase separation and dynamical arrest for particles interacting with mixed potentials—the case of globular proteins revisited

  • Gibaud, Thomas Department of Physics, University of Fribourg, Switzerland - Physics Department, Brandeis University, Waltham MA, USA
  • Cardinaux, Frédéric Department of Physics, University of Fribourg, Switzerland
  • Bergenholtz, Johan Department of Chemistry, University of Gothenburg, Göteborg, Sweden
  • Stradner, Anna Adolphe Merkle Institute, University of Fribourg, Switzerland
  • Schurtenberger, Peter Division of Physical Chemistry, Center for Chemistry and Chemical Engineering, Lund University, Sweden
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  • Soft Matter. - 2011, vol. 7, no. 3, p. 857
English We examine the applicability of the extended law of corresponding states (ELCS) to equilibrium and non equilibrium features of the state diagram of the globular protein lysozyme. We provide compelling evidence that the ELCS correctly reproduces the location of the binodal for different ionic strengths, but fails in describing the location of the arrest line. We subsequently use Mode Coupling Theory (MCT) to gain additional insight into the origin of these observations. We demonstrate that while the critical point and the connected binodal and spinodal are governed by the integral features of the interaction potential described by the normalized second virial coefficient, the arrest line is mainly determined by the attractive well depth or bond strength.
Faculté des sciences
Adolphe Merkle Institute
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