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    Dielectric characterization of electro-coagulated boron waste
    (PERGAMON-ELSEVIER SCIENCE LTD, 2014) Okutan, M.; Kavanoz, H. B.; Icelli, O.; Yalcin, Z.; Ay, F.; Delipinar, D.; Yakuphanoglu, F.
    The source of electro-coagulation boron waste (ECBW) is wastewater. In order to remove boron from wastewater, boron carried to mud in the form of industrial solid waste is rinsed through electrocoagulation method. The dielectric dispersion properties of the ECBW were analyzed determining the parameters such as complex dielectric functions, dissipation factor and surface conductivity. It is found that at lower frequencies, ECBW sample exhibits a high dissipation factor. The Cole-Cole plots of the sample indicate that the dielectric dispersion mechanism is a Debye type. The boron waste exhibits a high resistance material behavior with a value of 1.03 x 10(9) ohm/sq. and this result is consistent with the electrical behavior of ECBW plate. This study has shown that due to its high resistance and high dielectric dissipation factor, ECBW can be a valuable material for use in many industrial applications which require electrostatic dissipation or electromagnetic shielding. (C) 2013 Elsevier Ltd. All rights reserved.
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    Electrical Behavior of Probertite by Dielectric Spectroscopy
    (WALTER DE GRUYTER GMBH, 2014) Okutan, M.; Yalcin, Z.; Icelli, O.; Ay, F.; Boncukcuoglu, R.; Artun, O.; Delipinar, D.
    In this work of the material investigation, electrical parameters, which are real part and imaginary part of modulus, dielectric constant, dissipation factor, and conductivity, in the bulk pellet of probertite sample is presented. Electrical properties were investigated via temperature and frequency dependent dielectric spectroscopy. Real and imaginary part of dielectric parameter properties of the probertite were measured at frequencies from 100 to 15M Hz in the temperature range of 25 to 150 degrees C. Temperature dependence of the real part of the dielectric constant suggests that these compounds exhibit strong electromagnetic absorption and broadband electrical behavior.
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    Expanded Graphite Epoxy Composites Bipolar Plates for PEM Fuel Cells
    (ELECTROCHEMICAL SOC INC, 2011) Unveroglu, B.; Dundar, F.; Ay, F.; Yazici, S.; Ata, A.; Gasteiger, HA; Weber, A; Narayanan, SR; Jones, D; Strasser, P; SwiderLyons, K; Buchi, FN; Shirvanian, P; Nakagawa, H; Uchida, H; Mukerjee, S; Schmidt, TJ; Ramani, V; Fuller, T; Edmundson, M; Lamy, C; Mantz, R
    Light weight, flexible and thin single layer epoxy impregnated expanded graphite bipolar plates were manufactured and evaluated as a PEM fuel cell bipolar plate material. Mechanical strength values up to 17.41 MPa, in-plane electrical conductivity values up to 136.6 S/cm, through-plane electrical resistance of 0.027 Ohm-cm and flexibility (deflection at mid-span) values up to % 4.38 were obtained with epoxy impregnation in expanded graphite foams. The low thickness (similar to 0.5 mm) and density (similar to 1.2 g/cm(3)) values of the prepared composite plates put them one step ahead for mobile applications which require high mass and volumetric power density (W/kg, W/L). On the other hand, corrosion current and contact angle values of these composite plates couldn't achieve desired values.