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ESMER, KADİR

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End date: 2009 × Start date: 2009 ×

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    Bentonit ve sepiolit killerin elektrik ve dielektrik özelliklerinin polyvinylimadazole adsoprsiyonuyla iyileştirilmesi
    (2009-10-03) ESMER, KADİR; ESMER K., TEKİN N., KAYA A. U., Kara A., Beyaz S., Demirbaş Ö., TARCAN E.
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    Influence of alkali metallization (Li, Na and K) on photoluminescence properties of porous silicon
    (ELSEVIER SCIENCE BV, 2009-12) ESMER, KADİR; Esmer, Kadir; Kayahan, Ersin
    We present results for alkali metallization effects on photoluminescence (PL) properties of porous silicon (PS). The metallization of PS was realized by immersion plating in solutions containing 3 mM LiNO3, KNO3 and NaNO3 metal salts. The surface bond configuration of PS was monitored by Fourier transmission infrared spectroscopy (FTIR) and it was found that the PS surface was oxidized after metallization. Surface properties of PS were investigated by field emission scanning electron microscopy (FE-SEM) and it was found that the PS surface was covered by alkali metals for short immersion times. The PL intensity increased for critical immersion times and PL spectrum shifted to high energy region with the metallization. The experimental results suggest a possibility that the metallization provides a relatively easy way to achieve an increase in the PL intensity and oxidation of the PS surface. (C) 2009 Elsevier B.V. All rights reserved.
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    Bentonit ve Sepiolit Yüzeyine Polyvinylimadazole Adsoprsiyonunun Termodinamik Denge ve Kinetik Parametrelerinin İncelenmesi
    (2009-10-01) ESMER, KADİR; TEKİN N., ESMER K., Kara A., Beyaz S., KAYA A. U., Demirbaş Ö.
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    Calculated on H-1 and C-13 NMR Chemical Shifts of 2,4-Difluorobenzaldehyde Isonicotinoylhydrazone and 2,3-Dichlorobenzaldehyde Isonicotinoylhydrazone with GIAO, IGAIM, and CSGT Models
    (WILEY-HINDAWI, 2009) ESMER, KADİR; Guenay, N.; Tarcan, E.; Avci, D.; Coemert, H.; Esmer, K.; Atalay, Y.
    The H-1 and C-13 NMR chemical shifts of the 2,4-difluorobenzaldehyde isonicotinoylhydrazone (I) and 2,3-dichlorobenzaidehyde isonicotinoylhydrazone (II) were determined with the help of full spectral analysis. The geometry and electronic structure of the title compounds were investigated at both the ab initio Hartree-Fock and the B3LYP levels with 6-31+G(d,p) basis set. The NMR data were calculated by means of the CIAO, CSGT, and IGAIM methods. All quantum-chemical calculations, including those of NMR data, were performed by ab initio level HF and DFT methods. Excellent agreement between the theoretical and experimental results was found for the HF level H-1 and C-13 chemical shifts. The parameters of molecular geometry and H-1 and C-13 chemical shift values of the title compounds (I, II) in the ground state have been calculated and and compared with corresponding experimental result. (C) 2009 Wiley Periodicals, Inc, Concepts Magn Reson Part A 34A: 297-304, 2009.