Influence of the polymer concentration and ionic strength on the fine structure of coacervates
Under defined conditions, the complexation of polyelectrolytes leads to a liquid-liquid phase separation where a polymer-rich dense phase (coacervate) is in equilibrium with a polymer-poor phase (supernatant). The structure of a coacervate is between a concentrated polymer solution and a gel. The structure factor is typically fitted by the Ornstein Zernike function affording the mesh size. When the polymer is too high, the coacervate cannot form due to the too high ionic strength in the medium. This is referred at the self-suppressed coacervate. We recently put in evidence a linear decrease of the density of the coacervate phase as function of the polymer concentration until reaching the self-suppressed state. It is hypothesized that the mesh size should also vary as function of the polymer concentration. In this experiment we would like to study not only the role of the polymer concentration but also the ionic strength and the temperature on the mesh size of the coacervate and self-suppressed states phases.
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SCHATZ Christophe and PORCAR Lionel. (2021). Influence of the polymer concentration and ionic strength on the fine structure of coacervates. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.EASY-1045
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