WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection
Permanent URI for this collectionhttps://hdl.handle.net/11147/7150
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Article Disorder-Engineered Hybrid Plasmonic Cavities for Emission Control of Defects in hBN(American Chemical Society, 2026) Genc, Sinan; Yucel, Oguzhan; Aglarci, Furkan; Rodriguez-Fernandez, Carlos; Yilmaz, Alpay; Caglayan, Humeyra; Bek, AlpanDefect-based quantum emitters in hexagonal boron nitride (hBN) are promising building blocks for scalable quantum photonics due to their stable single-photon emission at room temperature. However, enhancing their emission intensity and controlling the decay dynamics remain significant challenges. This study demonstrates a low-cost, scalable fabrication approach to integrate plasmonic nanocavities with defect-based quantum emitters in hBN nanoflakes. Using the thermal dewetting process, we realize two distinct configurations: stochastic Ag nanoparticles (AgNPs) on hBN flakes and hybrid plasmonic nanocavities formed by AgNPs on top of hBN flakes supported on gold/silicon dioxide (Au/SiO2) substrates. While AgNPs on bare hBN yield up to a 2-fold photoluminescence (PL) enhancement with reduced emitter lifetimes, the hybrid nanocavity architecture provides a dramatic, up to 100-fold PL enhancement and improved uniformity across multiple emitters, all without requiring deterministic positioning. Finite-difference time-domain (FDTD) simulations and time-resolved PL measurements confirm size-dependent control over decay dynamics and cavity-emitter interactions. Our versatile solution overcomes key quantum photonic device development challenges, including material integration, emission intensity optimization, and spectral multiplexity.Article Lapatinib-Loaded ZIF-8 Nanoparticles: a Multifunctional Drug Delivery System With Anticancer, Antibacterial, and Antioxidant Properties(American Chemical Society, 2025) Aslan, Ezgi; Sanli-Mohamed, GulsahThe pitfalls of conventional chemotherapy, including poor solubility, off-target toxicity, and multidrug resistance, have driven the development of nanoparticle-based delivery systems. Here, we report the facile one-pot synthesis of lapatinib-encapsulated zeolitic imidazolate framework-8 (LAP@ZIF-8) nanoparticles. The formulation achieved an encapsulation efficiency of 72.4% and a drug loading capacity of 6.6%. Comprehensive physicochemical characterization confirmed uniform hexagonal morphology (SEM), favorable hydrodynamic size (236 +/- 2 nm; DLS), positive surface charge (+29 mV; zeta-potential), high crystallinity (XRD), and excellent thermal stability (TGA). LAP release was pH-responsive, with similar to 77% cumulative release at pH 5.5 (tumor-mimicking) versus 43% at pH 7.4 after 96 h. Serum-protein binding (<11%) and hemolysis (<2%) assays demonstrated good biocompatibility. In vitro, LAP@ZIF-8 exhibited potent, selective cytotoxicity toward HER2-positive SK-BR-3 breast-cancer cells (72 h IC50 = 1.2 mu g mL-1) while sparing HER2-negative MCF-7 cells. Importantly, both free LAP and LAP@ZIF-8 were well-tolerated by nontumorigenic MCF-10A mammary epithelial cells: viability remained >= 90% at <= 1 mu g mL-1 and exceeded 50% even at 100 mu g mL-1, indicating that the IC50 was not reached and providing a preliminary safety window for healthy tissues. Beyond its anticancer effects, the nanocarrier displayed broad-spectrum antibacterial activity (minimum bactericidal concentrations: 5 mg mL-1 for Staphylococcus aureus and 10 mg mL-1 for Escherichia coli) and moderate antioxidant capacity (DPPH IC50 = 666 mu g mL-1). Collectively, these results position LAP@ZIF-8 as a versatile, pH-sensitive platform that combines selective anticancer efficacy with low toxicity to healthy cells alongside ancillary antibacterial and antioxidant properties suitable for multimodal therapy.Article Sandwich-Structured Coating for Ultraviolet Protection and Thermal Management Applications(American Chemical Society, 2025) Kartal, U.; Yurddaskal, M.During the day, exposure to UV radiation poses risks to human health, while managing heat exchange is important for comfort in protective textiles. Recently, infrared-reflective materials have attracted attention, particularly for reducing the infrared transmission and moderating the thermal emission. In this study, titanium dioxide/copper–aluminum/titanium dioxide (TiO<inf>2</inf>/Cu–Al/TiO<inf>2</inf>, TCAT) sandwich-structured coatings were deposited on polyester fabric using magnetron sputtering. Deposition times (40 and 90 s) were varied to adjust Al and Cu layer thicknesses between 20 and 55 nm, and the resulting films were characterized by X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy, UV–vis spectroscopy, and thermal imaging. The coatings retained moderate visible transmittance on glass, whereas on woven polyester fabric, they formed an optically dense barrier with near-zero UV transmittance, suppressing light penetration across the visible to near-infrared (VIS–NIR) range. In conjunction with the emissivity-aware interpretation of thermography, these results substantiate substrate-independent UV shielding and optical/thermal barrier behavior of the TCAT multilayer. Thermal imaging qualitatively indicated reduced apparent surface temperature for coated fabrics compared to uncoated ones, suggesting partial thermal shielding. These results demonstrate the feasibility of integrating multifunctional coatings into daily-use polyester textiles, offering effective UV protection and the potential for thermal management in protective applications. © 2025 The Authors. Published by American Chemical SocietyArticle Citation - WoS: 1Citation - Scopus: 1Ferromagnetism Above 200 K in Organic-Ion Intercalated CrSBr(American Chemical Society, 2025) Ferreira-Teixeira, S.; Tezze, D.; Ramos, M.; Álvarez-García, C.; Bayındır, B.; Jo, J.; Gobbi, M.CrSBr is a van der Waals magnetic semiconductor exhibiting antiferromagnetic order below 140 K. It has emerged as a promising platform for engineering 2D magnetism because its intertwined electronic, optical, and magnetic properties can be profoundly modified via external stimuli such as electrical gating or magnetic fields. However, other strategies for tuning magnetism in layered materials, such as molecular intercalation, remain largely unexplored for CrSBr. Here, we demonstrate that the intercalation of tetramethylammonium (TMA) and tetrapropylammonium (TPA) ions into CrSBr induces a transition from antiferromagnetic to ferromagnetic order, while significantly enhancing the magnetic transition temperature to 190 K (TMA) and 230 K (TPA). The resulting intercalates are air-stable and exhibit large, hysteretic magnetoresistance exceeding 60% at 50 K in the TPA case. Besides, intercalation introduces symmetry-breaking structural changes in each CrSBr plane, revealed by Raman microscopy and corroborated by density functional theory (DFT) calculations. These findings highlight molecular intercalation as a powerful and versatile route to tailor the magnetic properties of CrSBr and unlock its potential to fabricate robust, high-temperature 2D magnetic devices. © 2025 Elsevier B.V., All rights reserved.Article Time-Resolved Stokes Polarization Analysis of Single Photon Emitters in Hexagonal Boron Nitride(American Chemical Society, 2025) Samaner, C.; Ateş, S.Solid-state quantum emitters are pivotal to the advancement of quantum technologies, particularly in quantum computation and communication, where the polarization of single photons serves as a key information carrier. Precise characterization of polarization is essential for understanding the underlying dynamics and minimizing polarization-related errors in emitter design. In this study, we employ the Rotating Quarter-Wave Plate (RQWP) method to perform comprehensive polarization analysis of quantum emitters in hexagonal boron nitride (hBN). By capturing both time-averaged and time-resolved polarization characteristics, we present the first demonstration of dynamic Stokes parameter evolution from single-photon emitters in hBN. Our work demonstrates a powerful method for revealing complex polarization dynamics that were previously inaccessible and provides new insights into the behavior of solid-state quantum emitters. The methods introduced here are broadly applicable to polarization studies across a range of solid-state quantum systems. © 2025 Elsevier B.V., All rights reserved.Article Citation - WoS: 2Citation - Scopus: 2Investigation on the Keggin Anchored on Hydroxide-Functionalized Single-Walled Carbon Nanotubes as Superior Cathode for Aqueous Zinc-Ion Batteries(American Chemical Society, 2025) Chilufya, Langson; Sertbaş, Vahide; Aytekin, Ahmet; Karabudak, Engin; Emirdag-Eanes, MehtapRechargeable aqueous zinc-ion batteries (AZIBs) have become a viable option in electrochemical energy storage systems (EESS) owing to their inherent safety features and economic friendliness. Nonetheless, creating suitable cathode materials for AZIBs with high structural stability, good rate performance, and great capacity remains a significant challenge. Polyoxometalate (POM)-based nanohybrid materials have shown promising results in high cycling stability and great specific capacity. However, POMs susceptible to electrolyte dissolution and the sluggish Zn-ion (Zn2+) kinetics have significantly hampered their electrochemical performance as cathodes for AZIBs. Herein, we present a Keggin POM, K<inf>3</inf>[PW<inf>12</inf>O<inf>40</inf>]·nH<inf>2</inf>O (KPW<inf>12</inf>), anchored on hydroxyl (OH)-functionalized single-walled carbon nanotubes (SWOH) that were fabricated via a facile ultrasonication procedure. Employed as cathodes for AZIBs, the optimal KPW<inf>12</inf>/SWOH feature exhibited remarkable electrochemical performance. The system satisfied the Zn2+storage, achieving a reversible discharge capacity of 183 mAh g–1at a high current density of 5C with a flat and long discharge plateau after 160 cycles. The perfect synergistic contribution of the pseudocapacitive nature of the super-reduced state of KPW<inf>12</inf>and the electron-conductive network of SWOH was attributed to this exceptional electrochemical performance. Furthermore, the presence of oxygen in SWOH enhanced the transfer kinetics of electrons and smooth Zn2+diffusion while lowering the Zn2+migration energy barrier by providing more accessible active sites. This demonstrates remarkable promise in fabricating robust electrode materials optimized for integration within aqueous battery systems that pave the way for further research into POM-based materials for EESS. © 2025 Elsevier B.V., All rights reserved.Article Silver-Loaded Titania-Based Metal-Organic Frameworks as a Platform for Silver Ion Release for Antibacterial Applications(American Chemical Society, 2025) Mazare, Anca; Goldmann, Wolfgang Heinrich; Kocak, Esra; Osuagwu, Benedict; Qin, Shanshan; Cao, Ran; Schmuki, PatrikConventional Ag-decorated TiO<inf>2</inf>coatings suffer from low adsorption capacity and burst release kinetics, limiting long-term antibacterial efficacy and risking cytotoxicity. An entirely different payload release approach can be based on metal–organic frameworks (MOFs), which offer tunable porosity, high surface area, and internal diffusion channels. Here, we report a thermally stabilized Ti-based MOF [NH<inf>2</inf>-MIL-125(Ti)] functionalized with Ag+via reactive deposition, enabling high Ag loading (∼14.7 wt %) and sustained release. Annealing at 250 °C enhances aqueous stability, allowing diffusion-governed Ag+delivery over >48 h, with 77% of the Ag still present in the MOF after a 24 h release. The system exhibits dose-dependent antibacterial activity in powders and comparable efficacy in coatings, with a more gradual release profile. This scalable platform is promising for long-acting coatings, wound interfaces, and implantable materials. © 2025 Elsevier B.V., All rights reserved.Article Citation - WoS: 7Citation - Scopus: 7Breaking the Boundaries of the Goldschmidt Tolerance Factor With Ethylammonium Lead Iodide Perovskite Nanocrystals(American Chemical Society, 2024) Güvenç, Çetin Meriç; Toso, Stefano; Ivanov, Yurii P.; Saleh, Gabriele; Balcı, Sinan; Divitini, Giorgio; Manna, LiberatoWe report the synthesis of ethylammonium lead iodide (EAPbI3) colloidal nanocrystals as another member of the lead halide perovskites family. The insertion of an unusually large A-cation (274 pm in diameter) in the perovskite structure, hitherto considered unlikely due to the unfavorable Goldschmidt tolerance factor, results in a significantly larger lattice parameter compared to the Cs-, methylammonium- and formamidinium-based lead halide perovskite homologues. As a consequence, EAPbI3 nanocrystals are highly unstable, evolving to a nonperovskite delta-EAPbI3 polymorph within 1 day. Also, EAPbI3 nanocrystals are very sensitive to electron irradiation and quickly degrade to PbI2 upon exposure to the electron beam, following a mechanism similar to that of other hybrid lead iodide perovskites (although degradation can be reduced by partially replacing the EA+ ions with Cs+ ions). Interestingly, in some cases during this degradation the formation of an epitaxial interface between (EA x Cs1-x )PbI3 and PbI2 is observed. The photoluminescence emission of the EAPbI3 perovskite nanocrystals, albeit being characterized by a low quantum yield (similar to 1%), can be tuned in the 664-690 nm range by regulating their size during the synthesis. The emission efficiency can be improved upon partial alloying at the A site with Cs+ or formamidinium cations. Furthermore, the morphology of the EAPbI3 nanocrystals can be chosen to be either nanocube or nanoplatelet, depending on the synthesis conditions.Article Citation - WoS: 8Citation - Scopus: 6Effect of external electric field on fluidization of rodlike particles using CFD-DEM(American Chemical Society, 2024) Kazemi, Saman; Aali, Hamed; Larijani, Roxana Saghafian; Zarghami, Reza; Liu, Helei; Mostoufi, NavidGiven the significant impact of an external electric field on fluidized bed hydrodynamics and the practical importance of rodlike particles, this study examines the behavior of a fluidized bed containing rodlike particles under various external electric fields. Simulations were performed using a coupled computational fluid dynamics-discrete element method, and rodlike particles were generated using a multisphere approach aided by quaternions. The effect of different vertical and horizontal external electric fields on the orientation of particles was investigated. Also, the effect of particle size on their orientation in the presence of constant vertical and horizontal external electric fields was explored in this work. The results showed that increasing the electric field strength and reducing the size of rodlike particles lead to an increment in the tendency of particles to become oriented along the direction of the electric field. Moreover, the effect of the external electric field at various inlet gas velocities on the probability distribution of the porosity in the bed was studied. Finally, the effect of vertical and horizontal electric fields on the bubble diameter was examined. This study offers a deeper understanding of the fluidization of rodlike particles in the presence of an electric field, and its findings can be applied to design and optimize related processes.Article Citation - WoS: 2Citation - Scopus: 2Exploring Noncentrifugal Sugar as a Partial Replacement for White Sugar in Low Methoxyl Pectin Confectionery Gels: Impacts on Physical and Rheological Properties(American Chemical Society, 2024) Fakhar, Hafiz Imran; Çavdaroğlu, Elif; Hayat, Muhammad Qasim; Janjua, Hussnain A.; Oztop, Mecit HalilNoncentrifugal sugar (NCS) is an unrefined, dark brown sugar containing minerals and plant secondary metabolites, unlike refined white sugar (WS). This study explored using NCS in confectionary jellies as an alternative sugar. We used different concentrations of NCS and WS to prepare low methoxyl pectin (LMP) confectionery gels characterized by their physical and rheological properties along with time-domain nuclear magnetic resonance (TD-NMR) relaxometry. The strongest LMP gel, with a hardness of 0.94 N, was achieved by substituting 25% of WS with NCS at a low CaCl2 concentration (0.075 M). Gels with up to 50% WS replaced by NCS showed comparable hardness to standard LMP gels made solely with WS at a 0.15 M CaCl2 concentration, attributed to NCS's unique constituents. The NCS-WS gel exhibited the shortest T2 values (139.8 ms) and self-diffusion coefficient values (4.99 x 10-10 m2/s), indicating a denser, more cross-linked structure that restricted water mobility. These findings suggest NCS's complex role in affecting LMP gels' chemical and physical properties, highlighting its potential as a partial WS replacement in LMP gelation-based products, with an additional source of minerals and antioxidants.