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Nanostructural Characteristics of Polymer Adsorption Layers Formed under Ultrasonic Treatment on Metal Oxides Surface in Aqueous Dispersions

Nikolay Bulychev1,2, Edward Kisterev1,Yulia Ioni1, Klaus Dirnberger2, Vitali Zubov3 and Claus Eisenbach2,4.
1 N.S. Kurnakov Institute of General and Inorganic Chemistry of Russian Academy of Sciences, 31 Leninsky Ave., 119991 Moscow, Russia 2 Institute for Polymer Chemistry, University of Stuttgart, 55 Pfaffenwaldring, D-70569 Stuttgart, Germany 3 Lomonosov Moscow State Academy of Fine Chemical Technology, 86 Vernadskogo Ave., 117571 Moscow, Russia 4 Research Institute for Pigments and Coatings, 37Allmandring, D-70569 Stuttgart, Germany
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The course and the result of the surface modification of titanium dioxide and ferrous oxide pigments in aqueous dispersion by ethylhydroxyethylcellulose (EHEC) without and with mechanical treatment of the dispersion by ultrasonic power was studied by the electrokinetic sonic amplitude (ESA) method. The evaluation of the ESA data showed that the ultrasonic treatment causes a significant thickness increase of the EHEC layer on the pigment which is primarily attributed to the ultrasonically induced activation of the pigment surface. The thickness of the polymer adsorption layer derived from ESA measurements was confirmed by TEM investigations. The ultrasonic treatment leads to significant changes of the adsorption layers properties and is a promising method for the surface modification of pigments with regard to dispersion stability.

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