Yazar "Coskun, Ramazan" seçeneğine göre listele

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    Crystallographic, structural, optical, and dielectric properties of aniline and aniline halide imprinted hydrogels for optoelectronic applications
    (Springer, 2023) Yalcin, Orhan; Coskun, Ramazan; Okutan, Mustafa; Oncan, Mehmet; Yesilot, Gursel
    This study examines the availability of aniline and aniline halide imprinted hydrogels for technological applications through crystallographic, structural, optical, and dielectric studies. Their optical band gap and ultraviolet-visible (UV-Vis) absorption spectra have been performed in the wavelength range of 190-900 nm. The dielectric properties, energy loss tangent/ dissipation factor (tand), and complex electric modulus were characterized at room temperature and a frequency range of 100 Hz to 100 MHz. The results suggest that the complex dielectric constant and modulus are related to Kroop's theory, Brownian motion in viscoelastic systems, and Maxwell-Wagner theory. Conductivity parameters and negative s-parameter values were obtained, providing insight into the conductivity mechanism of the samples. The Cole-Davidson plots of the complex dielectric constant and the Cole-Davidson plots adapted to Smith Chart diagrams were obtained to observe the sufficiency of the samples in electronic circuit applications. Overall, the study provides a detailed analysis of the dielectric, morphological, and optical properties of aniline and aniline halide imprinted hydrogels, demonstrating their potential for technological applications.
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    Equivalent device and optical band gaps analysis of acidic red dye imprinted hydrogels
    (Springer, 2022) Coskun, Ramazan; Okutan, Mustafa; Yalcin, Orhan; Ozturk, Muhittin; Kirsoy, Ahmet; Oncan, Mehmet
    Structural, optical and dielectric properties of high quality hydrogels with different doses acidic red dye imprinted were successfully analyzed in detail in this work into provide important information about the technological applications. Absorbance spectra and their energy band gaps for the acidic red dye imprinted hydrogels have been analyzed with UV spectroscopy. The complex dielectric constant, the tangent/dissipation factor (tan delta), the complex impedance, the capacitance and the complex electric modulus were measured in the frequency range of 100 Hz to 40 MHz at room temperature. It has been determined that the peak values of the tangent value in the AR doped samples in the high frequency region are due to the anionic dye effect, unlike the cationic dye doped samples. The dominant effects such as the complex dielectric constant and electric modulus in high frequency region for acidic red dye imprinted hydrogels have been attributed to the Maxwell-Wagner theory, the basis of Kroop's approach and the ionic conductivity. Experimental plane plots (Cole-Cole plots) of the complex dielectric constant, impedance and electric modulus for different doses acidic red dye imprinted hydrogels were obtained. In order to analyze the suitability of the samples for electrical circuit applications, the equivalent electrical circuit corresponding to the Cole-Cole plots for the complex electric modulus was calculated and adapted with Smith Chart.
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    Investigation of capacitors and electrical circuit elements performance of magnetic biocomposites prepared by using the hemp biomass
    (Elsevier Science Sa, 2023) Coskun, Ramazan; Yalcin, Orhan; Okutan, Mustafa
    Hemp biomass (HB) was brought into activated hemp biomass (AHB) by chemical technique and all samples were obtained by doping different nanoparticles. Structural, dielectric and magnetic characterizations for all samples were performed by using the XRD, FTIR, SEM, EDX, LCR Meter and PPMS at room temperature. The characteristics of both hemp biomass and nanoparticles in the structures of these samples were examined in detail. In addition to HB and AHB samples, the contribution of lignin and pectin characteristic bands to con-ductivity was investigated in AHB samples doped with Fe3O4, MgFe2O4 and SrFe2O4 nanoparticles. It has been determined that homogeneously dispersed nanoparticles contribute to surface area, crystallization and con-ductivity and these samples are technological products. It was determined that the samples could be used as batteries, and two electrical circuits simultaneously connected to the lignin and pectin structures of the activated hemp biomass (AHB) doped with different types of nanoparticles were obtained from the Smith-Chart diagram.
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    Structural, morphological and dielectrical properties of acorn cupule extract doped hydrogels
    (Elsevier, 2024) Gorguluer, Omer; Coskun, Ramazan; Yalcin, Orhan; Okutan, Mustafa; Uslu, Hasan; Doganay, B. Seyma
    Acorn cupule extract doped different hydrogels were prepared to examine their structural morphological and dielectrical properties at room temperature. Structural, morphological and dielectrical parameters for all samples were found by using the XRD, SEM, EDX and impedance spectroscopy. The conductivity, capacitive effect and electronic circuit properties for acorn cupule extract doped hydrogels have not studied before in the literature. Therefore, the complex impedance, capacitance, phase angles, dielectric constant, tangent factor, electric modulus and frequency evolution of ionic conductivity (s -parameters) were successfully analyzed in detail using impedance spectroscopy in the frequency range of 10 2 to 10 7 rad/s at RT. Furthermore, the Cole -Cole plots of the dielectric constant adapted to the Smith chart and general RC equivalent circuit was showed in detail. It was determined that the dielectric effect was at its highest values in the frequency range of 10 2 to 10 5 rad/s.