Konformation geladener Polymere in Lösung und an Grenzflächen

这项拟议的研究涉及带电聚合物在水中溶液的理论描述的各个方面。这部分对应于DFG资助的M.Castelnovo论文工作的继续，部分对应于与在柏林或美因茨的德国同事合作完成的工作。将考虑三个方面：聚电解质吸附、聚两性离子和反离子缩合。聚电解质吸附的研究工作旨在给出聚电解质多层膜的定量描述，这些多层膜是由相反电荷的聚电解质连续吸附形成的。重点讨论了两个方面，一是链刚性的影响，二是相继层间界面电荷相反的聚合物之间的络合作用。还将考虑包覆有吸附的聚电解质的颗粒的电泳法。在斯特拉斯堡进行的两个实验--从表面拉出的聚两性阳离子链的微观操纵和稠密的聚两性阳离子溶液的性质--推动了关于聚两性阳离子的工作。最后，我们将研究非均匀情况下的反离子凝聚：典型的例子是棒状聚电解质吸附在相反电荷的表面上，或者凝聚在所谓的珍珠项链结构上。

The proposed research deals with various aspects of the theoretical description of charged polymers in solution in water. It corresponds in part to the continuation of the thesis work of M. Castelnovo financed by the DFG and in part to work done in collaboration with German colleagues in Berlin or in Mainz. Three aspects will be considered: polyelectrolyte adsorption, polyampholytes and counterion condensation. The work on polyelectrolyte adsorption will aim at giving a quantitative description of polyelectrolyte multilayers which are formed by successive adsorption of polyelectrolytes of opposite charges. Two aspects will be emphasized, the influence of the chain stiffness and the complexation between polymers of opposite charges at the interface between consecutive layers. The electrophoresis of particles coated with adsorbed polyelectrolytes will also be considered. The work on polyampholyte is motivated by two experiments performed in Strasbourg, the micromanipulation of polyampholyte chains pulled from a surface and the properties of dense polyampholyte solutions. Finally we will study counterion condensation in situations when it is not homogeneous: typical examples are a rodlike polyelectrolyte adsorbing on a surface of opposite charge or the condensation on the so-called pearl-necklace structure.