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Adsorption of polyethyleneimine and polymethacrylic acid onto synthesized hematite
S Chibowski1, J Patkowski, E Grzadka
1Faculty of Radiochemistry and Chemistry of Colloids, Department of Chemistry, University of Maria Curie-Sklodowska, Pl. Marii Curie-Sklodowskiej 3, 20-031 Lublin, Poland.
Abstract:
An influence of different functional groups of polymer, its molecular weight, polydispersity ratio (M(w)/M(n)) and presence of impurities on its adsorption in different pH values (3, 6 and 9) onto synthesized hematite (Fe(2)O(3)) was measured. A structure of adsorbed macromolecules of PMA and PEI was obtained according to S-F theory. Two polymers were used: polymethacrylic acid (PMA) of 6500 and 75,100 molecular weight as well as polyethyleneimine (PEI) 25,000 commercial and fractionated. Electrokinetic properties of the interface oxide-polymer solution (surface charge density and zeta potential) were also measured as well as adsorption layer thicknesses (with use of viscosimetric measurements). Obtained data show, that all above-mentioned factors do influence not only the adsorption process itself but also a surface charge, zeta potential and structure of adsorbed polymer layers on polymer/hematite interface.
