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    Öğe
    Fabrication of superhydrophobic and highly oleophobic electrochromic composite surfaces
    (Elsevier Science Sa, 2016) Yıldırım, Mehmet; Demir, Gulizar Elif; Caglar, Aysel; Cengiz, Ugur; Kaya, İsmet
    Mechanically stable, superhydrophobic and highly oleophobic polymeric electrochromic (EC) composite surfaces were prepared. Firstly, an acrylate-based terpolymer with perfluoroalkyl side chains was synthesized as surface tension reducing component of the composite surfaces. Before the use, pre-synthesized terpolymer was gelled to gain higher mechanical stability. Obtained conducting gel was added into the electropolymerization media including 3,4-ethylenedioxythiophene (EDOT) or pyrrole (Py) monomers dissolved in an electrolyte solution. Electrodeposition time was varied to optimize the surface wettability characteristics. Water contact angles (WCA) and salad oil contact angles (OCA) were determined by Attension Theta Optical Tensiometer. WCA and OCA of flat surfaces were quite lower than those of the EC composite surfaces with high surface roughness caused by poly (3,4-ethylenedioxythiophene) (PEDOT) component. PEDOT and PPy components have provided not only EC properties but also surface roughness that particularly increases WCA and OCA. (C) 2016 Elsevier B.V. All rights reserved.
  • [ X ]
    Öğe
    Multilayer electrochromic surfaces derived from conventional conducting polymers: Optical and surface properties
    (Elsevier Science Bv, 2015) Demir, Gulizar Elif; Yıldırım, Mehmet; Cengiz, Ugur; Kaya, İsmet
    In this study, some kinds of multilayer (double and triple) electrochromic (EC) surfaces were prepared using layer-by-layer (LBL) electrodeposition techniques. Polypyrrole (PPy) was deposited as the first layer and the upper layers were changed. EC characteristics were investigated by spectroelectrochemical measurements. Surface roughness parameters (Root Mean Square-RMS) were determined using atomic force microscopy (AFM) technique. The results showed that different color options may be obtained by altering LBL deposition of EC polymers. Equilibrium water contact angle (circle minus(equ)(water)) measurements showed that incorporation of hydrophilic poly(3,4-ethylenedioxythiophene) PEDOT in LBL EC surfaces resulted in a decrease in the contact angle. However, the circle minus(equ)(water) of multilayer films increased with the incorporation of the hydrophobic polycarbazole (PCarb) layer. (C) 2015 Elsevier B.V. All rights reserved.