Dergi makalesi Açık Erişim
Cabuk, Mehmet; Yavuz, Mustafa; Unal, H. Ibrahim
{ "DOI": "10.1016/j.colsurfa.2014.02.053", "abstract": "In this study, biodegradable and conducting polyaniline-graft-chitosan (PAni-g-CS) copolymer was synthesized by radicalic polymerization using ammonium persulfate (NH4)(2)S2O8 as initiator. The synthesized copolymer was characterized by using particle size, density, band gap, H-1 NMR, TGA, and SEM measurements. The characterization results revealed the successful synthesis of the graft copolymer of PAni and CS. Electrokinetic properties and colloidal stabilities of PAni-g-CS dispersions were examined as a function of time, pH, electrolytes, various surfactants, and temperature by means of zeta-potential measurements in polar (water) and non-polar (silicone oil) media. The zeta-potential of PAni shifted to more positive region after grating with chitosan. In acidic medium, zeta-potential of the copolymer was observed to increase up to +44 mV. The presence of monovalent (Nacl) electrolyte had no impact on zeta-potential of the copolymer dispersions whereas; divalent (BaCl2) and trivalent (AlCl3) electrolytes caused the zeta-potentials of the dispersions to shift to more positive regions. The most effective surfactant on the zeta-potential of the PAni-g-CS was determined to be sodium dodecyl sulfate, which reduced the value of zeta-potential to -39 mV. Elevated temperatures caused almost no change on the zeta-potential of the copolymer dispersions. In non-aqueous media, zeta-potential of PAni-g-CS was found to be in colloidally stable region. Further, PAni-g-CS was tested against Escherichia coli and showed an improved antibacterial activity when compared to that of pristine PAni and CS. (C) 2014 Elsevier B.V. All rights reserved.", "author": [ { "family": "Cabuk", "given": " Mehmet" }, { "family": "Yavuz", "given": " Mustafa" }, { "family": "Unal", "given": " H. Ibrahim" } ], "container_title": "COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS", "id": "65989", "issued": { "date-parts": [ [ 2014, 1, 1 ] ] }, "page": "494-501", "title": "Electrokinetic properties of biodegradable conducting polyaniline-graft-chitosan copolymer in aqueous and non-aqueous media", "type": "article-journal", "volume": "460" }
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