Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
Permanent URI for this collectionhttps://hdl.handle.net/11147/7148
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Article Citation - WoS: 3Citation - Scopus: 1Porous Polymer-Derived Ceramics for Environmental Applications: Sorption, Filtration, and Catalysis(Elsevier B.V., 2025) Icin, Oyku; Zeydanli, Damla; Biesuz, Mattia; Soraru, Gian Domenico; Vakifahmetoglu, CekdarPolymer-derived ceramics (PDCs), obtained from preceramic polymers, have emerged as promising materials for environmental applications due to their high thermal and chemical stability, tunable nano-microstrucure and porosity, and versatile surface functionalities. This review focuses on the recent advances in porous PDCs and their use in key environmental fields such as sorption, filtration, and catalysis. A comparative analysis of precursor chemistry, synthesis strategies, and resulting structural properties is presented, emphasizing how these factors influence performance in environmental remediation tasks. By consolidating findings across specific application areas, the work aims to clarify the functional potential of PDCs and identify current research gaps and opportunities for future development in environmental material science.Article Recent Developments in the Treatment of Leishmaniasis: Natural Compounds, Drug Targets, in Silico Molecular Docking Approaches, and Nanocarriers(Elsevier B.V., 2025) Gürbüz Çolak, N.Leishmaniasis is a common tropical disease caused by Leishmania protozoa. It affects 0.9 to 1.6 million people, causing 20,000–30,000 deaths annually. There are no effective vaccines, and current treatments have severe side effects. Drug resistance is a major obstacle in treating leishmaniasis. The necessity of drug discovery is indisputable. Natural compounds are promising candidates for drug discovery studies because of their diverse chemical structures and bioactivities. Experimental screening of compound libraries imposes high costs and is time-consuming. The molecular docking approach is beneficial for exploring new therapeutics in silico as it allows the screening of millions of drug candidates. Even if new drug candidates are discovered, delivery of the active ingredient to the target remains controversial. Nanocarriers are promising nanosystems that can address the drawbacks of drug delivery. This chapter focuses on natural compounds as drug candidates, targets, in silico drug discovery, and drug delivery for the treatment of leishmaniasis. © 2025 Elsevier Inc.Article Effects of Edge Addition or Removal on the Nullity of a Graph(Elsevier B.V., 2024) Batal,A.Lights Out is a game which can be played on any graph G. Initially we have a configuration which assigns one of the two states on or off to each vertex. The aim of the game is to turn all vertices to off state for an initial configuration by activating some vertices where each activation switches the state of the vertex and all of its neighbors. If the aim of the game can be accomplished for all initial configurations then G is called always solvable. We call the dimension of the kernel of the closed neighborhood matrix of the graph over the field Z2, nullity of G. It turns out that G is always solvable if and only if its nullity is zero. Moreover, the number of solutions of a given configuration is also determined by the nullity. We investigate the problem of how nullity changes when an edge is added to or removed from a graph. As a result we show that for every graph with positive nullity there exists an edge whose removal decreases the nullity. Conversely, we show that for every always solvable graph which is not an even graph with odd order, there exists an edge whose addition increases the nullity. We also show that if an always solvable graph is not even, then there is an edge whose removal increases the nullity. © 2024Article Citation - WoS: 3Citation - Scopus: 3Macroporous Polymer-Derived Ceramics Produced by Standard and Additive Manufacturing Methods: How the Shaping Technique Can Affect Their High Temperature Thermal Behavior(Elsevier B.V., 2024) Zambotti,A.; Kulkarni,A.; Semerci,T.; Vakifahmetoglu,C.; Pelanconi,M.; Bottacin,S.; Sorarù,G.D.This work proposes the processing of porous ceramic lattices via three polymer-derived ceramic routes, namely powder bed fusion and infiltration, fused filament fabrication and replica, and a direct replica of a foamed polymer. A common feature in the processing of these lattices is the use of the same polysilazane as the preceramic source for the Si-C-N-O network that builds up during ceramization. We adopted rotated cube, honeycomb and randomized cellular geometries as a matter of comparison for thermal exchange when an air flow is forced through the structures up to 1050 °C. The three procedural pathways are discussed in their limitations regarding geometry, polymer-to-ceramic conversion, high-temperature heat exchange performance and durability. In this regard, while rotated cube geometry results in the best thermal exchange and highest pressure drop, we show a correlation between chemical composition and high temperature oxidation of the Si-C-N-O network, possibly attributed to the selection of the processing routes. © 2024 The AuthorsArticle Citation - WoS: 8Citation - Scopus: 8Fast-Firing of Potassium Sodium Niobate (knn)(Elsevier B.V., 2024) Karacasulu,L.; Karakaya,M.; Adem,U.; Sglavo,V.M.; Biesuz,M.; Vakifahmetoglu,C.Potassium sodium niobate (KNN) is one of the most promising Pb-free piezo-ceramics. In the present work, KNN was produced by fast-firing with different cooling strategies, i.e., fast and slow cooling. Dielectric, ferroelectric, and piezoelectric properties of fast-fired pellets were determined and compared with those of conventional-sintered products. Although the samples produced by fast-firing had higher density than those obtained by conventional sintering, fast-cooled samples following fast firing show relatively low electrical properties. When fast-firing was combined with slow cooling, the electrical properties, especially piezoelectric d33 values, were improved. The material subjected to fast-firing at 1120 °C using slow cooling gave the highest relative density (about 95 %) with fine grains microstructure and a d33 of 112 pC/N whereas that produced by conventional sintering resulted in d33 of 80 pC/N with a relative density of 88 % for the same dwell time (30 min). © 2024 The AuthorsEditorial Special Issue on the 4th International Conference on Recycling and Reuse 24–26 October 2018, Istanbul, Turkey: Preface(Elsevier B.V., 2019) Okten, H.E.; Ökten, Hatice Eser; Balkaya, N.; Aydin, S.; Elmaslar, E.; Ongen, A.; Selcuk, H.[No abstract available]