Yazar "Beyazsakal, Levent" seçeneğine göre listele

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    Boron-containing compounds as a new candidate for supercapacitor electrode: simplified synthesis and structural identification properties
    (Elsevier Science Inc, 2023) Akdemir, Murat; Kivrak, Hilal Demir; Kilic, Ahmet; Beyazsakal, Levent; Kaya, Mustafa; Horoz, Sabit
    In this study, the performance of two boron-containing compounds, C14H14BNO2 center dot HCl (BCC1) and C38H38B2Cl2N4O4 (BCC2), as electrodes in supercapacitor applications was investigated in the presence of Na2SO4 and KOH electrolyte solutions. The specific capacitance values of the compounds were compared, and the results showed that trivalent boron (BCC1) exhibited higher specific capacitance values than tetravalent boron (BCC2) in both electrolyte solutions. In the presence of Na2SO4 electrolyte solution, the specific capacitance values of the trivalent (BCC1) and tetravalent (BCC2) boron compounds at a current density of 0.75 A/g were 135.21 and 94.87 F/g, respectively, while in the presence of KOH electrolyte, the specific capacitance values of the trivalent (BCC1) and tetravalent (BCC2) boron compounds at a current density of 0.75 A/g capacitance values were determined as 106.62 and 88.25 F/g, respectively. The cycling stability of the electrodes was also studied, and it was found that the capacitance of BCC1 electrode increased gradually over the cycles, while the capacitance of BCC2 electrode decreased. The study suggests that trivalent boron can be a promising material for supercapacitor applications. However, further research is required to optimize the cycling stability of the electrodes and understand the underlying mechanism.
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    Investigation of electrochemical properties of tri- and tetravalent boronate ester compounds for supercapacitor applications
    (Springer Heidelberg, 2022) Akdemir, Murat; Hansu, Tulin Avci; Kilic, Ahmet; Beyazsakal, Levent; Kaya, Mustafa; Horoz, Sabit
    The motivation of the current study is to use the synthesized tri- and tetravalent boronate esters (C15H16BNO3 center dot HCl(B-1) and C40H42B2Cl2N4O4, (B-2)), respectively, for the first time as electrodes in the presence of different electrolyte solutions in supercapacitor applications and to measure their specific capacitances. As a result of the electrochemical measurements, it is determined by experimental observations that the specific capacitance value of the tetravalent (B-2) electrode is higher than that of trivalent (B-1) in the presence of both different electrolyte solutions. Furthermore, when the morphological properties of both materials are examined, it is observed that tetravalent boronate ester (B-2) has a more porous structure and its surface area is higher than trivalent boronate ester (B-1) as a conclusion of the surface area measurement. As a consequence of this research, it has been demonstrated that tetravalent boronate ester (B-2) can be employed as a promising material for future supercapacitor energy storage applications.
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    Öğe
    Preparation and spectral studies of boronate ester modified magnetite iron nanoparticles (Fe3O4@APTES-B) as a new type of biological agents
    (Elsevier, 2022) Kilic, Ahmet; Karatas, M. Emin; Beyazsakal, Levent; Okumus, Veysi
    We have designed two novel magnetite targeting biological agents (Fe3O4@APTES-B-(1,B-2)) with a core of Fe3O4 and a shell made of boronate esters (APTES-B) to improve the biological effectiveness of magnetite Fe3O4 nanoparticles (MNPs). Initially, two boronate esters (B-1) and (B-2) have been prepared by 3,4dihydroxybenzaldehyde and phenylboronic acid and/or butylboronic acid using a Dean-Stark apparatus to remove the water formed during the esterification reactions. Then, the APTES-B-1,(2) compounds have been synthesized via boronate esters and APTES in the presence of 1-2 drops of formic acid as catalyst. Finally, magnetite Fe3O4 NPs were added to APTES-B-1,B-2 compounds to afford boronate ester modified magnetite iron nanoparticles (Fe3O4@APTES-B-1,B-2) at ambient temperature, respectively. The boronate esters (B-1) and (B-2), APTES-B-1,B-2 compounds, and boronate ester modified magnetite iron nanoparticles (Fe3O4@APTES-B-1,B-2) were characterized using a combination of NMR (H-1, C-13, and B-11), FT-IR, UV-Vis, LC-MS/MS, elemental analysis (CHN), XRD, SEM-EDX, EDX mapping, BET, and TG-DTA). Then, the antioxidant, antimicrobial and DNA binding activities of newly synthesized target compounds were tested. These results suggest that all compounds are also one of the propitious drug candidates and are worthy of further investigation. (C) 2022 Elsevier B.V. All rights reserved.