Yazar "Aksoy, Onder" seçeneğine göre listele

Listeleniyor 1 - 5 / 5
  • [ X ]
    Öğe
    Evaluation of Pomegranate (Punica Granatum L.) Pulps for the Removal of Copper(II) Ions: Kinetic, Equilibrium, and Desorption Studies
    (Taylor & Francis Inc, 2014) Guzel, Fuat; Aksoy, Onder; Akkaya, Gulbahar
    Pomegranate pulp has been used as novel adsorbent for removing Cu(II) ions from aqueous solution. The optimum conditions for removal of Cu(II) ions were found to be pH 5.32, biosorbent dose 0.1g, contact time 120 minutes, initial concentration 50mg/L, and temperature 30 degrees C. The kinetic data were well fitted to the pseudo-second-order model. The biosorption process agreed with the Langmuir isotherm model. Maximum monolayer biosorption capacity was 7.30mg/g. Thermodynamic parameters suggest that the biosorption process is spontaneous and exothermic. Desorption studies were carried out with different desorbing agents.
  • [ X ]
    Öğe
    Evaluation of synthesized new chitin derivatives in Schottky diode constructions
    (Taylor & Francis Inc, 2020) Uzun, Ilhan; Aksoy, Onder; Topal, Giray; Celik, Omer; Ocak, Yusuf Selim
    Chitin was reacted with coumarin-3-carboxylic acid (C3CA) and benzophenone-3,3MODIFIER LETTER PRIME,4,4MODIFIER LETTER PRIME-tetracarboxylic dianhydride (B33MODIFIER LETTER PRIME44MODIFIER LETTER PRIMETD), and the synthesized chitin derivatives (CC3CA and CB33MODIFIER LETTER PRIME44MODIFIER LETTER PRIMETD) were characterized by spectroscopic methods and other techniques (FTIR, C-13 CP/MAS solid-state NMR, XRPD, SEM, and TGA). Also, the charge carrier density, hole mobility, and electrical conductivity of CB33MODIFIER LETTER PRIME44MODIFIER LETTER PRIMETD were determined. Lastly, Schottky diodes were constructed using these derivatives, and some electrical properties (barrier height, ideality factor, and series resistance) and photoelectrical properties (light sensitivity, short circuit current, and open circuit voltage) of the diodes were determined. It was seen that the diodes have very good ideality factor and light sensitivity.
  • [ X ]
    Öğe
    New chitin derivatives and their Schottky diodes: Synthesis and characterization
    (Sage Publications Ltd, 2019) Aksoy, Onder; Uzun, Ilhan; Topal, Giray; Celik, Omer; Ocak, Yusuf Selim; Batibay, Derya
    First, chitin was reacted with 4,5-dichlorophthalic acid and diphenic acid, and thus two new chitin derivatives (C45DA and CDA) were synthesized. Then, C45DA and CDA were characterized by various spectroscopies and techniques (FTIR, C-13 CP-MAS solid-state NMR, XRPD, SEM, and TGA/DTA). Besides, some electrical properties of C45DA were measured. After the characterization process, the Schottky diodes of C45DA and CDA were made. It was determined that these diodes showed photodiode characteristics at the same time. Later on, both electrical properties (phi(b), n, and R-s) and photoelectrical properties (I-illumination/I-Dark, I-SC and V-OC) of these diodes were determined.
  • [ X ]
    Öğe
    Schottky Diodes Based on the New Chitin Derivatives
    (Maik Nauka/Interperiodica/Springer, 2019) Aksoy, Onder; Uzun, Ilhan; Topal, Giray; Ocak, Yusuf Selim; Celik, Omer; Batibay, Derya
    New chitin derivatives were synthesized by the reactions of chitin with o-acetylsalicyloyl chloride and phthaloyl chloride and their structure was characterized by FTIR and C-13 CP-MAS solid-state NMR spectroscopy and X-ray powder diffraction technique. Also, the thermal and surface properties of the chitin derivatives were investigated by thermogravimetric analysis and a scanning electron microscope. In addition, some electrical properties of the polymers were determined using Hall effect technique. Then, the Schottky diodes were fabricated by the formation of interlayers of chitin derivatives between Au metal and n-Si semiconductor, and the electrical and photoelectrical properties of the diodes were determined.
  • [ X ]
    Öğe
    Synthesis, characterization, and Schottky diode applications of low-cost new chitin derivatives
    (Springer, 2018) Aksoy, Onder; Uzun, Ilhan; Topal, Giray; Ocak, Yusuf Selim; Celik, Omer; Batibay, Derya
    In this study, low-cost two new chitin derivatives were first synthesized. Products formed in the consequence of the reaction of chitin with 4-nitrobenzoyl chloride and 3,5-dinitrobenzoyl chloride were named C4NC and C35DC, respectively. Then, C4NC and C35DC were characterized by FTIR and C-13 CP-MAS solid-state NMR spectroscopies and X-ray powder diffraction technique. Surface topography and composition of C4NC and C35DC with a scanning electron microscope were investigated. Mass loss in C4NC and C35DC with thermogravimetric analysis method was determined as a function of increasing temperature. Endothermic and exothermic transitions in C4NC and C35DC were investigated with differential thermal analysis and differential scanning calorimetry techniques. Later on, charge carrier density, hole mobility, and electrical conductivity values of C4NC and C35DC were determined. Besides, Schottky diodes of C4NC and C35DC were constructed, and several parameters related to these diodes were determined. Finally, the sensitivity of these diodes to light was studied.