Yazar "Sacak, Mehmet" seçeneğine göre listele

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    Conductive potassium feldspar/polyaniline composites prepared by in situ chemical polymerization
    (ELSEVIER SCIENCE SA, 2007) Cetinkaya, Sevil; Karakisla, Meral; Oezer, Ali; Sacak, Mehmet
    K-feldspar particles using potassium dichromate in an acidic aqueous medium. The effects of K-feldspar particle size, aniline concentration and temperature upon the PAn amount in the composite and the electrical surface resistance of the composites were examined. Electrical conductivity was higher in the composites prepared by the smaller K-feldspar particles in which the PAn yield is low. The microhardness values of K-feldspar/PAn composites increased to a certain PAn content and then decreased. The microhardness of the composites containing PAn in the range of 1-6%, which were prepared by K-feldspar having particle size smaller than 0.125-0.250 nm, was higher that of pure K-feldspar and PAn (0.843 kPa). Scanning electron microscopy (SEM) showed that PAn covered the surface of K-feldspar particles with an unsmooth PAn layer. The characterization of composites was also made by Fourier transform infrared spectroscopy (FTIR) and thermogravimetric analysis (TGA). (C) 2007 Elsevier B.V. All rights reserved.
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    Synthesis and characterization of conductive poly(o-anisidine)/talc composite
    (Gazi Universitesi, 2018) Anaklı, Duygu; Çetinkaya, Sevil; Karakışla, Meral; Sacak, Mehmet
    Conductive poly(o-anisidine) (POA)/talc composite was prepared by chemical polymerization of o-anisidine in the presence of talc using ammonium persulfate (APS) as oxidant. The polymerization parameters such as APS/o-anisidine mol ratio, o-anisidine and HCl concentration on the conductivity and POA amount of the POA/talc composite were investigated. The increased microhardness property of the talc particles by the addition of the conducting polymer was examined by micro indentation analysis. The structural, morphological and thermal properties of the composites were analyzed by using FTIR (Fourier transform infrared spectroscopy), XRD (X-ray diffraction), SEM (Scanning electron microscopy), BET (Brunauer-Emmett-Teller) surface area analysis and TGA (Thermogravimetric analysis) techniques. © 2018 Gazi Universitesi Muhendislik-Mimarlik. All rights reserved.
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    Synthesis and characterization of poly(o-toluidine)/kaolinite conductive composites for humidity and temperature sensing
    (PAMUKKALE UNIV, 2018) Boran, Filiz; Cetinkaya, Sevil; Karakisla, Meral; Sacak, Mehmet
    Conductive poly(o-toluidine)/kaolinite composite was synthesized via chemical polymerization of o-toluidine in the availability of kaolinite using ammonium persulfate as oxidizing agent. To investigate the use of the prepared conductive composite as humidity and temperature sensor, the effect of polymerization conditions such as HCl, o-toluidine and oxidant concentrations on the amount of conductive POT contained in the composite and the conductivity values of composites were investigated. It was found that the composites with the highest poly(o-toluidine) content (29.4%) and conductivity (8.3x10(-4) Scm(-1)) were obtained by 0.2 M ammonium persulfate, 0.4 M o-toluidine and 1 M hydrochloric acid for 2 hours of continuous polymerization at 20 degrees C. The resistivity values of pure poly(o-toluidine) and poly (o-toluidine)/kaolinite composite were monitored during heatingcooling cycles in the range of 0-100 degrees C. Changes in resistivity for pure poly(o-toluidine) and poly(o-toluidine)/kaolinite composite with humidity 30-90% were examined and humidity sensor behavior was determined. Characterization of the prepared composite was performed by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), thermogravimetric analysis (TGA) and scanning electron microscopy techniques (SEM).