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Adsorption of surfactants on polymer surfaces investigated with a novel zeta-potential measurement system
Reischl, Martin ; Ribitsch, Volker ; Stana-Kleinschek, Karin
The determination of electrokinetic properties such as zeta-potential of polymer samples with classical methods is laborious and time-consuming. For this reason, a reliable, fast and easy to use ...measurement system based on streaming potential measurement was developed. In this novel measurement system, the streaming potential is created by an oscillating flow of a small amount of electrolyte solution through the sample media. In addition, this setup allows diredt titration and therefore time-resolved monitoring of changes in yeta-potential in a seconds time-scale. With this instrument, the concentration, as well as the time-dependent adsorption behaviour of various non-ionic, anionic and cationic surfactants on a novel, regenerated cellulosic polymer was investigated. This new cellulose-based, fibrous textile polymer is permanently cationised, not only at the surface but throughout the whole fibre. The results show that even very low concentrationsof surfactant, due to its charge and chemical composition, highly influence the surface charge of the polymer in a large range. Furthermore, the results for this new textile material are compared with other textile fibres.
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