Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection

Permanent URI for this collectionhttps://hdl.handle.net/11147/7148

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  • Book Part
    Energy Production from Gas Hydrates
    (Elsevier, 2025) Çifçi, G.; Parlaktuna, M.; Çelebi, S.S.; Günaydın, S.O.
    Gas hydrates are a type of natural formation that contains large amounts of mostly methane, which is also known as natural gas, and water, in the form of ice. Methane hydrates are cages of water molecules that surround and trap methane molecules. Gas hydrate is geophysical, geologically and economically important for several reasons: Gas hydrates are good cap rocks for oil and natural gas. The methane hydrate itself is an important energy source. A volume of gas hydrate can store up to 164 times per volume of gas as zipped gas, and the fact that gas hydrate occurs almost all around the world. Methane seepage may indicate the existence of a deeper hydrocarbon reservoir, and the methane production and migration in the slope sediments may cause massive slope failure. Last but not least Methane gas has a minimum 22 times more global warm absorption capacity compared to carbon dioxide if it is released into the atmosphere. In other words, greenhouse gas is due to its contribution to climate change. Gas hydrates have drawn significant interest as a potential near future energy resource. Research in the production field of gas hydrates has focused on several key areas, including the feasibility of commercial production, the environmental impacts, and the technological improvements associated with the safe recovery of gas. © 2025 Elsevier Inc. All rights are reserved, including those for text and data mining, AI training, and similar technologies.
  • Book Part
    Sample Preparation Using Microfluidic Technologies for Non-Invasive Tests
    (Elsevier, 2025) Oksuz, C.; Tarim, E.A.; Ozcan, H.A.; Koc, S.; Tekin, H.C.
    The collection of a biological sample and the steps carried out to obtain the target in a sample covers the sample preparation procedures which are one of the important steps for diagnostic tests. Removing interferences in a complex sample, preventing undesirable reactions, separating, purifying, and enriching the sample are among the steps that can be applied to samples for analysis. Non-invasive tests include samples such as urine, saliva, sweat, tear, breath and are preferred because they are simple, painless, cost-effective and cause fewer complications. In traditional methods applied in clinics, most of the steps such as centrifugation, pipetting, staining, and washing are performed manually by a technician. For this reason, tests are costly, require long analysis time, and have a significant risk of contamination and manual errors. Microfluidic technologies allow automating sample collection and preparation steps by integrating many components on a single chip. Thereby, low-volume samples can be processed automatically with high efficiency and purity. In this chapter, the sample preparation methods used in microfluidic devices for non-invasive tests analyzing human samples including sweat, urine, saliva, tears, sexual samples, and other body fluids are reviewed. This information aims to facilitate the development of potential sample preparation methods and applications for non-invasive diagnostic tests. © 2024 Elsevier Inc. All rights are reserved, including those for text and data mining, AI training, and similar technologies.
  • Book Part
    Waste to Energy Management
    (Elsevier, 2025) Yagmur Goren, A.Y.; Kalinci, Y.; Dincer, I.
    Today, the world faces growing challenges with waste problems since people have moved the problems from past to future. The key question is: is waste a problem or a resource? The correct response to this question can be found by investigating, in more detail, the types of waste and implemented waste management methods. The chapter consists of six main sections. The first section is focused on classification, which explains what waste is and categorizes it according to the producer (e.g., municipal, industrial, and hazardous) and chemical composition (for instance, organic, inorganic, and microbiological). The second section presents legislative trends. It is seen that the waste management legislations are changing from country to country. Also, it can change over time because every technological development emerges its waste. The third section covers waste management methods such as recycling, refuse-derived fuel, landfill, and thermal methods. The landfill method is the oldest and the cheapest one. It is seen that the method will continue in the near future, too, though a lot of legal regulations have been made to reduce its usage. Thermal methods are commonly used in the industrial sector. Hence, thermal methods such as incineration, pyrolysis, and gasification are examined in detail. Considering environmental issues, thermal technology moves toward gasification systems to reduce greenhouse gas emissions and the formation of by-products. The fourth section presents illustrative examples related to using waste management methods or their combinations. Further, a case study, which consists of a circulated fluidized bed gasification system, is investigated from the exergy and exergoeconomic points of view. The chapter presents exergy and exergoeconomic analyses in detail. The analyses show that it can produce 1.17 MWe power and 0.521kg/s hydrogen with 3.33 $/kg cost from 8.5kg/s biomass waste. Finally, future scenarios for waste management are investigated. Also, to achieve zero waste targets in the future, circular economy and industrial symbiosis concepts are examined, and some successful examples from around the world are presented. © 2025 Elsevier Inc. All rights are reserved, including those for text and data mining, AI training, and similar technologies.
  • Article
    Rice-Like, Hollow, and Rhombohedral Nano-Calcite Synthesis by Carbonization
    (Elsevier, 2026) Kilic, Sevgi; Toprak, Gorkem; Ozdemir, Ekrem
    Controlling the morphology and size of calcium carbonate (CaCO3) remains an essential challenge in the production of high-performance fillers and advanced functional materials. Here, we report a continuous carbonization strategy that enables the synthesis of monodisperse nano-calcite particles with tunable rice-like, hollow, and rhombohedral morphologies through precise control of CO2 dissolution into a flowing Ca(OH)2 solution under diffusion-limited conditions. A two-stage reactor was designed to decouple nucleation and growth by separating the gas-liquid interaction zone from a stabilization tank. pH and conductivity analyses revealed that crystallization is primarily governed by the CO2 dissolution kinetics rather than mixing intensity in the stabilization tank. SEM and XRD analyses demonstrate a distinct crystallization sequence such that initial formation of rice-like calcite, subsequent development of hollow nanoparticles through selective tip dissolution, and final transformation into rhombohedral calcite via dissolution-reprecipitation mechanism. The method provides a reproducible, template-free route for fabricating hollow CaCO3 nanoparticles, overcoming limitations of bubbletemplating and additive-mediated techniques. This scalable process provides a robust foundation for producing high-surface-area CaCO3 nanomaterials which have potential applications in thin films, ceramics, protective coatings, lightweight composites, thermal/acoustic insulation, adsorption, and catalysis, where tailored particle morphology and size can significantly enhance performance.
  • Article
    Comparison of the Photoresponse Characteristics for 4H-SiC Schottky Barrier UV Photodetector with Graphene and Ni/Cr Electrode
    (Elsevier, 2026) Dulcel, Atilla Mert; Gozek, Melike; Unverdi, Ozhan; Celebi, Cem
    Gr/4H-SiC and Ni/Cr/4H-SiC Schottky junction UV photodetectors were fabricated and investigated to reveal the effect of electrode materials on the device performance such as spectral response and response speed. I-V characterization, spectral response, and response speed (on-off) measurements were conducted for the UV wavelength range between 200 and 400 nm. The maximum photo-responsivity was obtained as 0.081 A/W for Gr/4H-SiC and 0.041 A/W for Ni/Cr/4H-SiC at a wavelength of 260 nm. This result was attributed to the higher optical transmittance of the graphene electrode compared to the semitransparent Ni/Cr electrode. Zero bias response speed measurements were done under 280 nm wavelength UV light pulsed at different frequencies such as 100 Hz, 500 Hz, and 1000 Hz. The Gr/4H-SiC and Ni/Cr/4H-SiC photodetectors show distinctly different decay times of 5.04 ms and 305.1 mu s, respectively, while their rise times were found to be similar. This observation has been explained by the inclination of graphene to act as a trap site for photogenerated holes.
  • Article
    Continuous Direct Lithium Extraction from Seawater Via an Unconventional Selective Solid Electrolyte
    (Elsevier, 2026) Li, Jinghui; Gao, Jiaxuan; Yu, Zihao; Yan, Linxue; Guo, Yafei; Demir, Mustafa; Deng, Tianlong
    With the significant depletion of terrestrial lithium resources, attention has shifted toward seawater, which holds the largest lithium reserves on Earth. However, extracting lithium from seawater presents a complex challenge due to its intricate composition and extremely low concentration of lithium ions. Herein, we demonstrated inexpensive Li4Ti5O12 as a selective solid electrolyte for direct lithium extraction from seawater. It extracted lithium ions from seawater at an initial concentration of 0.17 mg/L and enriched them to 22.25 mg/L in the receiving solution. The sodium and magnesium ion concentrations were only 33.5 mg/L and 0.66 mg/L. The Li/ Na selectivity (SLi/Na) and Li/Mg selectivity (SLi/Mg) were remarkably high, reaching 42,000 and 240,000, respectively. Furthermore, DFT showed that the energy required for both processes-desolvation of sodium ions and migration of ions within the crystal-is significantly higher than that for lithium ions, which explains the high selectivity of this method. XAS and XRD refinement revealed that the lithium-ion conductor remained stable without any decomposition. In addition, we designed a comprehensive process using the phase equilibrium method, enabling the direct separation of lithium hydroxide without waste when Li4Ti5O12 serves as the selective solid-state electrolyte, thereby highlighting its strong potential for industrial applications.
  • Book Part
    Corn Oil Blends
    (Elsevier, 2025) Ozen, B.; Tokatli, F.
    This book chapter is focused on corn oil blends and their diverse applications. Corn oil, primarily obtained through the extraction of corn germ, is renowned for its high concentration of essential unsaturated fatty acids, particularly linolenic acid as well as tocopherols. Its utility extends beyond the realm of food products, extending into cosmetics, pharmaceuticals, animal feeds, and biodiesel production. The first section of this chapter summarizes the chemical composition and properties of corn oil, highlighting its nutritional attributes. Subsequently, it delves into innovative combinations involving corn oil and other edible oils such as fish, sunflower, coconut, and soybean oils, showcasing the diverse applications of these blended oils. The primary objective of these blends is reported to enhance the oxidative stability of the oils within them. The blends, including corn oil, were investigated for their thermal stability as frying oil. In addition, corn oil is combined with various fats and oils, including tallow and milkfat, for the production of interesterified fats. Furthermore, shortenings incorporate these oil blends, some of which contain corn oil. This chapter also includes examples of research studies assessing the impact of blending on health-related factors. In addition to the practical applications, a considerable portion of research has been dedicated to detecting the presence of corn oil in various oil blends. This is achieved through a combination of spectroscopic approaches and various chemometric methods. © 2026 Elsevier Inc. All rights reserved.
  • Article
    Design, Synthesis, and Evaluation of Anticancer Activities of 1,2-Diborolane Derivatives for Hepatocellular Carcinoma: an in Vitro and in Silico Study
    (Elsevier, 2026) Sahin, Yuksel; Antika, Gizem; Aktan, Cagdas; Metin, Kubilay; Ozgener, Huseyin
    Hepatocellular carcinoma (HCC) is the most prevalent form of primary liver cancer and remains a major global health challenge due to limited treatment options and poor prognosis. Boron-containing compounds have garnered attention for their diverse biological activities, including pro-apoptotic effects in various types of cancer. In this study, we synthesized a panel of novel 1,2-N-substituted-1,2-diborolane derivatives and evaluated their antiproliferative, antimigratory, and apoptotic effects on hepatocellular carcinoma cell lines, HepG2 and Hep3B. Spectroscopic analyses confirmed the structural integrity of the synthesized compounds, revealing characteristic 1H-, 11B-, and 13C-NMR shifts consistent with boron-oxygen and boron-nitrogen bonding patterns. The derivatives, particularly compounds 2, 3, and 6, demonstrated potent and selective cytotoxicity toward HCC cells, with compound 3 exhibiting the lowest IC50 value (6.75 mu M) in HepG2 cells. Their time-dependent anti-proliferative effects were further supported by colony formation assays demonstrating long-term growth suppression, while wound healing assays revealed marked inhibition of HepG2 cell migration, indicating the compound's anti-metastatic potential. Our results demonstrate that the compound significantly induces apoptosis, modulates the expression of key apoptotic genes (Bax, Bcl-2, and caspase-3). In silico molecular docking further confirmed strong binding affinity to the anti-apoptotic Bcl-2 protein, supporting the proposed mechanism of action. These findings highlight the compound as a promising candidate for further preclinical evaluation in liver cancer therapy.
  • Book
    Enhanced Geothermal Systems (EGS) for Sustainable Development
    (Elsevier, 2025) Chandrasekharam, D.
    Enhanced Geothermal Systems for Sustainable Development presents EGS as an essential tool in securing abundant, clean, carbon-free energy to help meet growing global energy demands. This book lays a foundation with an overview of the thermal regime of the earth, addresses carbon dioxide sources, their effects on the climate and mitigation strategies using EGS, summarizes hydrothermal sources, EGS concepts, its historical background, EGS technology, economic and environmental considerations and culminates in global case studies. Authored by a recognized geothermal energy expert, Enhanced Geothermal Systems for Sustainable Development delivers a centralized text that emphasises fundamental principles, methodology, application, and economics of Enhanced Geothermal Systems, delivers a basic understanding of EGS concepts and applications in the lab and field, includes global case studies demonstrating the viability of geothermal energy, and supports sustainability. Packed with foundational and practical information on EGS, as well as case studies highlighting EGS applications worldwide, this book presents a much-needed overview for undergraduate and graduate students, energy industry professionals and researchers, and companies seeking a stake in the carbon-neutral business to reduce their carbon footprints. This essential volume covers EGS basics, technologies, applications, and benefits, along with case studies, examples, and economics. This accessible text on EGS is essential in the present context of global energy security - it paves a path to a carbon-free future that is within reach. © 2025 Elsevier B.V., All rights reserved.
  • Book Part
    Aeration Systems for Wastewater Treatments
    (Elsevier, 2025) Recepoğlu, Y.K.; Gören, A.Y.
    Aeration systems are critical components in wastewater treatment, playing a fundamental role in enhancing oxygen transfer to support microbial activity essential for pollutant breakdown. This chapter provides a comprehensive overview of various aeration techniques, including diffused, mechanical, natural, and jet aeration systems, detailing their operational mechanisms, efficiencies, and energy consumption. The chapter also addresses design considerations, advantages, and limitations, with a focus on optimizing performance and sustainability. Through a detailed analysis, the chapter underscores the indispensable role of aeration systems in advancing wastewater treatment processes and promoting environmental sustainability. © 2025 Elsevier Inc. All rights are reserved, including those for text and data mining, AI training, and similar technologies.