Poly(L-lysine)-poly(ethylene glycol) layers with different structure and their influence on silica suspension stability |
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Authors: | Małgorzata Wiśniewska Iwona Ostolska |
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Affiliation: | Department of Radiochemistry and Colloid Chemistry, Faculty of Chemistry, Maria Curie-Sklodowska University, Lublin, Poland |
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Abstract: | The effects of the structure of di- and triblock copolymers of poly(L-lysine) – LYS with poly(ethylene glycol) – PEG as well as the length of nonionic fragment in the LYS-PEG macromolecule on the copolymer chains conformation in the adsorption layer formed on the colloidal silica (SiO2) surface were examined. Spectrophotometry and turbidimetry were applied for the determination of copolymer adsorbed amounts and stability coefficients of silica aqueous suspensions. The electrokinetic parameters such as solid surface charge density and zeta potential were also estimated. The adsorption of LYS-PEG was proved to be the highest at pH 10 whereas the lowest adsorption on the solid surface was found for the triblock copolymer with long fragments of LYS at the same pH value. |
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Keywords: | Colloidal silica poly(L-lysine) poly(ethylene glycol) LYS-PEG copolymer layer structure copolymer-silica composites biocompatible polyamino acid |
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