Browsing by Author "Mutlu, Saliha"

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    Engineering of the high-power laser-induced synthesis of Ni-based metal-organic framework: investigation of its optical properties, computational methodology, electrocatalytic performances, and glucose-sensing ability
    (Wiley-VCH Verlag GmbH & Co. KGaA, 2024-10-16) Mutlu, Saliha; Ortaç, Bülend; Karatutlu, Ali; Görkan, Taylan; Durgun, Engin; Söyler, D.; Söylemez, S.; Arsu, N.; Savaşkan Yılmaz, Sevil
    Metal-organic frameworks (MOFs) are porous materials with numerous chemical and structural possibilities. Due to their ease of modification, well-organized structure, and diverse guest molecule chemistry, MOFs are ideal platforms for uncovering improved functional material design characteristics. Quantitative analysis of glucose is crucial, especially in some food products, for quality control as well as evaluation of the glucose levels helps diagnose and treat diabetes. Recent glucose sensing devices have relied heavily on MOFs and other nanomaterials to enable user-friendly and safe non-invasive sensing methods. Nevertheless, the conventional synthesis methods involve multi-day reactions, cooling, and depressurization processes. This study demonstrates the unprecedented high-power laser-induced rapid synthesis (LIRS) of Ni-based MOF nanospheres with interconnected nano-rods and noncentrosymmetric primitive triclinic crystalline structure, highlighting their multifunctional usage in sensing and gas sorption applications. Ab initio simulations show excellent agreement with the experimental physical and gas sorption properties. Furthermore, the Ni-MOF-based biosensor accurately measures glucose real-life beverage samples, yielding promising glucose detection biosensor results with a low limit of the detection (LOD) of 13.96 µM and high sensitivity of 120.606 µA mM$^{−1}$ cm$^{−2}$.
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    Laser-driven rapid synthesis of metal-organic frameworks and investigation of UV-NIR optical absorption, luminescence, photocatalytic degradation, and gas and Ion adsorption properties
    (MDPI AG, 2024-01-12) Mutlu, Saliha; Ortaç, Bülend; Özbey, Doğukan Hazar; Durgun, Engin; Savaşkan Yılmaz, Sevil; Arsu, Nergis
    In this study, we designed a platform based on a laser-driven approach for fast, efficient, and controllable MOF synthesis. The laser irradiation method was performed for the first time to synthesize Zn-based MOFs in record production time (approximately one hour) compared to all known MOF production methods with comparable morphology. In addition to well-known structural properties, we revealed that the obtained ZnMOFs have a novel optical response, including photoluminescence behavior in the visible range with nanosecond relaxation time, which is also supported by first-principles calculations. Additionally, photocatalytic degradation of methylene blue with ZnMOF was achieved, degrading the 10 ppm methylene blue (MB) solution 83% during 1 min of irradiation time. The application of laser technology can inspire the development of a novel and competent platform for a fast MOF fabrication process and extend the possible applications of MOFs to miniaturized optoelectronic and photonic devices.
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    Radiation shielding tests of crosslinked polystyrene-b-polyethyleneglycol block copolymers blended with nanostructured selenium dioxide and boron nitride particles
    (MDPI, 2022-02-01) Cinan, Zehra Merve; Erol, Burcu; Baskan, Taylan; Mutlu, Saliha; Ortaç, Bülend; Savaskan Yilmaz, Sevil; Yilmaz, Ahmet Hakan
    In this work, gamma-ray shielding features of crosslinked polystyrene-b-polyethyleneglycol block copolymers (PS-b-PEG) blended with nanostructured selenium dioxide (SeO2 ) and boron ni-tride (BN) particles were studied. This research details several radiation shielding factors i.e., mass attenuation coefficient (µm ), linear attenuation coefficient (µL ), radiation protection efficiency (RPE), half-value layer (HVL), tenth-value layer (TVL), and mean free path (MFP). The irradiation properties of our nanocomposites were investigated with rays from the152 Eu source (in the energy intervals from 121.780 keV to 1408.010 keV) in a high-purity germanium (HPGe) detector system, and analyzed with GammaVision software. Moreover, all radiation shielding factors were determined by theoretical calculus and compared with the experimental results. In addition, the morphological and thermal characterization of all nanocomposites was surveyed with various techniques i.e., nuclear magnetic resonance (NMR), Fourier-transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), and transmission electron microscopy (TEM). Acceptable compatibility was revealed and observed in all nanocomposites between the experimental and theoretical results. The PS-b-PEG copolymer and nanostructured SeO2 and BN particles exerted a significant effect in enhancing the resistance of the nanocomposites, and the samples with high additive rates exhibited better resistance than the other nanocomposites. From the achieved outcomes, it can be deduced that our polymer-based nanocomposites can be utilized as a good choice in the gamma-irradiation-shielding discipline. © 2022 by the authors. Licensee MDPI, Basel, Switzerland.
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    Thermal conductivity and phase-change properties of boron nitride–lead oxide nanoparticle-doped polymer nanocomposites
    (MDPI AG, 2023-05-16) Ortaç, Bülend; Mutlu, Saliha; Baskan, T.; Savaşkan Yılmaz, Sevil; Yilmaz, A. H.; Erol, B.
    Thermally conductive phase-change materials (PCMs) were produced using the crosslinked Poly (Styrene-block-Ethylene Glycol Di Methyl Methacrylate) (PS-PEG DM) copolymer by employing boron nitride (BN)/lead oxide (PbO) nanoparticles. Differential Scanning Calorimetry (DSC) and Thermogravimetric Analysis (TGA) methods were used to research the phase transition temperatures, the phase-change enthalpies (melting enthalpy (ΔHm), and crystallization enthalpies (ΔHc)). The thermal conductivities (λ) of the PS-PEG/BN/PbO PCM nanocomposites were investigated. The λ value of PS-PEG/BN/PbO PCM nanocomposite containing BN 13 wt%, PbO 60.90 wt%, and PS-PEG 26.10 wt% was determined to be 18.874 W/(mK). The crystallization fraction (Fc) values of PS-PEG (1000), PS-PEG (1500), and PS-PEG (10,000) copolymers were 0.032, 0.034, and 0.063, respectively. XRD results of the PCM nanocomposites showed that the sharp diffraction peaks at 17.00 and 25.28 °C of the PS-PEG copolymer belonged to the PEG part. Since the PS-PEG/PbO and the PS-PEG/PbO/BN nanocomposites show remarkable thermal conductivity performance, they can be used as conductive polymer nanocomposites for effective heat dissipation in heat exchangers, power electronics, electric motors, generators, communication, and lighting equipment. At the same time, according to our results, PCM nanocomposites can be considered as heat storage materials in energy storage systems.
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    Thermally conductive phase change nanocomposites presenting PS-PEG/ SeO2 and PS-PEG/BN/SeO2
    (Elsevier BV, 2024-12-05) Mutlu, Saliha; Ortaç, Bülend; Başkan, Taylan; Yılmaz, Sevil Savaşkan; Yılmaz, Ahmet Hakan
    The phase change and thermal conductivity properties of nanocomposite materials consisting of cross-linked Poly(Styrene-block-Ethylene Glycol Dimethyl Methacrylate) (PS-PEG DM), boron nitride (BN), and selenium dioxide (SeO$_2$) were investigated in this study. The different content of phase-changed materials (PCM) nanocomposites was prepared by using the hydraulic pressure technique. Promising melting enthalpy values (104.5, 98.8 and 165.8 J g$^{-1}$) have been reached for P1Se3, P2BN2Se2, and P3BN2Se2 PCM nanocomposites. The enthalpy efficiencies associated with the processes of melting and freezing, denoted as λ$_m$ and λ$_c$, respectively, were determined by the analysis of data obtained from DSC. Our study was demonstrated to present comprehensive information on the PS-PEG/BN, PS-PEG/SeO2, and PS-PEG/BN/SeO2 phase change nanomaterials, thereby facilitating their potential applications in various fields. The phase change and thermal conductivity properties of PS-PEG/BN/SeO$_2$ nanocomposites were investigated. The incorporation of SeO2 and BN nanoparticles significantly enhanced the thermal conductivity (for P2BN4Se5), reaching values up to 8.277 W m$^{-1}$ K$^{-1}$. The λ$_m$ values of P1Se3, P2BN2Se2, and P3BN2Se2 were calculated as 68.79, 61.23, and 87.86, respectively. The λ$_c$ values of P2Se3; P1BN2Se2 were also calculated at 70.10; 98.93 and 161.92, respectively.