1 Ocak 2014 Dergi makalesi Açık Erişim

Cabuk, Mehmet; Yavuz, Mustafa; Unal, H. Ibrahim

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        "name": "Cabuk, Mehmet"
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        "affiliation": "Suleyman Demirel Univ, Fac Arts & Sci, Dept Chem, TR-32200 Isparta, Turkey", 
        "name": "Yavuz, Mustafa"
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      {
        "affiliation": "Gazi Univ, Fac Sci, Dept Chem, Smart Mat Res Lab, Ankara, Turkey", 
        "name": "Unal, H. Ibrahim"
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    "description": "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.", 
    "doi": "10.1016/j.colsurfa.2014.02.053", 
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      "pages": "494-501", 
      "title": "COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS", 
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    "publication_date": "2014-01-01", 
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    "title": "Electrokinetic properties of biodegradable conducting polyaniline-graft-chitosan copolymer in aqueous and non-aqueous media"
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