Effect of surface charges on structure and interactions of Cn-PEO micelles
Micelles formed by n-alkyl - endcapped poly(ethylene oxides) polymers are excellent model materials to study ultrasoft colloidal interactions. In previous studies the interaction could be almost perfectly described using an effective pair potential of Likos et al. The potential is a combination of a logarithmic dependence at small interparticle distances and a Yukawa-type tail derived for uncharged particles. The effective parameter in this model is the aggregation number of the micelles, which can be tuned by changing block copolymer characteristics. In the present work we propose to extend the tuneability by introducing charges on the surface of the micelles which modulates the strength and range of the interaction by an additional Coulomb repulsion. The charges are implemented by carboxy groups at terminal position of the PEO chain such that they are located on the surface of the micelles. We intend to study both the effect on inter- and intraparticle properties as a function of the degree of dissociation varied by pH. We note that beside the microscopic properties also the macroscopic rheological behavior can be adjusted such that these materials are of technological relevance.
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WILLNER Lutz; MATSARSKAIA Olga; PREVOST Sylvain; SCHWEINS Ralf; STELLBRINK Joerg; WALDORF Christin Maria Anna and WILLNER Luis. (2021). Effect of surface charges on structure and interactions of Cn-PEO micelles. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-10-1629
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