Yazar "Ram, Manoj K." seçeneğine göre listele

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    Nitrogen Doped Carbon-Dot Embedded Poly(lactic acid-co-glycolic acid) Composite Films for Potential Use in Food Packing Industry and Wound Dressing
    (Mdpi, 2022) Şahiner, Mehtap; Ari, Betül; Ram, Manoj K.; Şahiner, Nurettin
    Here, nitrogen-doped carbon dots (N-doped CDs) were synthesized by the hydrothermal method embedded within poly(lactic acid-co-glycolic acid) ((PLGA)) films at different amounts. The N-doped CDs (or CD) that possess fluorescence properties also have antimicrobial properties against S. aureus and E. coli microorganisms, determined by the disc diffusion method with 19 +/- 2 and 18 +/- 1 mm zone diameters, respectively. The CD embedded PLGA films (CD@PLGA) with different CD contents revealed an increased fluorescence intensity with the increased amount of CD. Moreover, the antibacterial potency of 50% CD containing PLGA (50-CD@PLGA) films (by weight) against S. aureus and E. coli microorganisms was examined and the zone diameters were found to be 14 +/- 1 and 13 +/- 1 mm, respectively. In addition, CD release studies from different amounts of CD (2.5-50 by weight) containing composite films showed that 50-CD@PLGA film released 127 +/- 16 mg/g CD dots, which is 38 +/- 5% of the embedded CDs in about 12 days, suggesting their potential application in food packing and wound dressing. Moreover, all CD@PLGA films were found to be blood compatible via hemolysis and blood clotting index tests with 90% blood clotting indices regardless of their CD content.
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    Recent developments in CO2 capture, utilization, related materials, and challenges
    (Wiley, 2022) Gizer, Süleyman G.; Polat, Osman; Ram, Manoj K.; Şahiner, Nurettin
    Anthropogenic activities including the combustion of fossil fuels have led to a dramatic increase in the rate of carbon dioxide (CO2) emission in the last three decades. Since fossil-based fuels are still the predominant energy source for this century, CO2 is a colossal problem. It is emitted as a consequence of combustion and human activities and is a major greenhouse gas (GHG) that significantly contributes to climate change and global warming, making CO2 emission a worldwide problem. The Intergovernmental Panel on Climate Change (IPCC) has proposed a 45% decrease in anthropogenic CO2 emissions by 2030, with a target of net-zero CO2 emissions by 2050. Despite its harmful effects, CO2 has the potential to be used for a wide range of different industrial needs, after its capture. CO2 capture technologies are still in the early stage of development because of economic and technological issues. However, in the future, carbon capture and related application technologies and methods may become easier and more accessible due to the new developments in the materials synthesis, strategies and skills and inexpensive utilization, and functioning cost of the employed methods. Furthermore, carbon capture system (CCS) might improve the recent power plan system properties. Concerning climate change, carbon capture is deemed as a promising solution to prevent CO2 emissions. CO2 capture, storage, and utilization are garnering intensive interest from scientists worldwide. This review paper identifies and gave particular attention to the literature on the recent CO2 capture technologies, for example, adsorption, absorption, membrane, and algae-based separation techniques for pre-combustion, oxy-fuel combustion, and post-combustion periods. Aside from all of these capture technologies, the utilization and application of captured CO2 in various industrial fields such as solvents, chemicals, and fuels are evaluated.
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    The synthesis and characterization of PTCDA-Co(II), and PTCDA-La(III) fluorescent MOFs br
    (Elsevier Science Sa, 2022) Demirci, Şahin; Gizer, Görkem; Polat, Osman; Ram, Manoj K.; Şahiner, Nurettin
    Metal organic frameworks (MOFs) are unique porous materials with a high surface area employing variety of organic ligands and metal ion components. Moreover, the possibility of developing different additional features, such as magnetic, thermo-responsive, and fluorescent properties that come from the organic ligands and/or metal ions can methodically increase the industrial application of MOF structures. In this paper, perylene 3,4,9,10 tetracarboxylic dianhydride (PTCDA) based MOFs with fluorescent properties were synthesized using Co(II) and La(III) metal ions as nodules. The disappearance of carbonyl group peaks at 1756 cm1 from PTCDA molecules confirmed the synthesis of PTCDA-based Co(II) and La(III) MOFs. The SEM image revealed that the prepared PTCDA-Co(II) MOFs are in ellipsoidal shapes, whereas the PTCDA-La(III) MOFs are in rod or fiber-like shapes. The BET surface area of prepared PTCDA-Co(II) and PTCDA-La(III) MOFs were determined as 125.9 m2/g and 29.9 m2/g, respectively. The prepared PTCDA-based Co(II) and La(III) MOF exhibit fluorescent properties, e. g., upon exposure to 465 nm excitation wavelength, they have fluorescence emission intensity of 10,500 and 13,000 (a.u) at 514 and 510 nm wavelength, respectively. The quenching activity of Cu(II), Ni(II), As(III), and Hg (II) metal ions on fluorescence properties of PTCDA-La(III) MOFs were examined. Moreover, it was observed that the prepared PTCDA-Co(II) and PTCDA-La(III) MOF show 82.9 +/- 0.4 and 95.4 +/- 4.1 % Fe(II) chelating activity at 1400 mu g/mL concentration of PTCDA-Co(II) and PTCDA-La(III). Lastly, Quantum yield was calculated as 52 +/- 1 % for PTCDA-La(III) MOF