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Browsing by Author "Okutan, Mustafa"

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    Article
    Resistivity, Esr, and Radiation Shielding Properties of the Volcanic Rock Materials
    (Hindawi Ltd, 2014) Nuhoglu, Cigdem; Tapan, Mucip; Okutan, Mustafa; Aydin, Sureyya; Yalcin, Zeynel; Icelli, Orhan; Orak, Salim
    Pumices have been used in cement, concrete, brick, and ceramic industries as an additive and aggregate material. It will be important to study pumice types by using a different tool as EPR which is a new technique for related material to be used for industrial aims. Electron spin resonance (ESR) spectra of the pumice types were taken by EMX-type spectrometer. Also, the current-voltage (I-V) and surface resistivity probe stand of the thin films was studied using a four-point probe measurements. The relationship between radiation shielding properties of the pumice samples and their surface resistivity, chemical, and electrokinetic properties was evaluated using simple regression analysis. Simple regression analysis indicated a strong correlation between surface resistivity and density and SiO2, Fe2O3, CaO, MgO, and TiO2 content of pumice samples in this study. It is found that a correlation between determined g-factor by EPR spectroscopy and radiation shielding is established for pumice samples.
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    Article
    Temperature Dependency of Electrical Behaviors in Single Walled Carbon Nanotube/Conducting Polymer Composites
    (Elsevier Science Sa, 2007) San, S. Eren; Yerli, Yusuf; Okutan, Mustafa; Yilmaz, Faruk; Gunaydin, Okan; Hames, Yakup
    Temperature dependent electrical characterization of a composite, made by dispersing single-walled carbon nanotubes (SWNT) in polythiophene (PT) conducting polymer, is performed. Critical temperatures are found by investigating electrical properties and the electrical behaviors of the synthesized systems constitute a good infrastructure for both understanding the intrinsic mechanisms and optimizing new similar synthesizes. The dielectric constant epsilon' of PT/SWNT composite is found to be higher than that of PT overall temperatures and frequencies. Conductivity of PT/SWNT sample jumped to larger values at high temperatures. C) 2007 Elsevier B.V. All rights reserved.