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IRAMIS, "Saclay Institute of Matter and Radiation", gathers 6 Units or Laboratories with scientific research activities on Condensed Matter, Atoms and Molecules. Most units are associated with other partners : CNRS , École Polytechnique and ENSICAEN.

Our research topics:
- Nanoscience
- Radiation-matter interaction
- Materials and complex systems

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img New regime in polyelectrolyte solutions   

Philippe Lorchat, Iuliia Konko, Jérôme Combet, Jacques Jestin, Albert Johner, André Laschewski, Sergei Obukhov, and Michel Rawiso

Usually polyelectrolyte solutions present a peak in the polyion/polyion structure factor for some value qof the momentum transfer (scattering vector). We describe a new regime in dense polymer solutions, typically above 1mol/L, where qis proportional to the concentration c of the solution. It is however not observed for all polyelectrolytes but only for those of intermediate stiffness, usually together with an ultimate regime where qis proportional to c and local orientational order prevails. This regime is robust against sample preparation and stable over time. We can understand it as jammed with randomly oriented persistent segments. This may explain why fully developed nematic order is so difficult to observe in synthetic polyelectrolytes.

A. Menelle, 2015-03-20


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