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Permanent URI for this collectionhttps://hdl.handle.net/20.500.14288/3
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Publication Metadata only Polyurethanes for elastomers(American Chemical Society, 2023) Department of Chemistry; Yılgör, Emel; Yılgör, İskender; Department of Chemistry; College of SciencesPolyurethanes consisting of hard and soft segments—chemically linked together with covalent bonds along a linear or crosslinked polymeric backbone—display mechanical properties ranging from soft elastomers to tough rubbers (depending on their chemical compositions), along with chain topologies and bulk morphologies. The availability of a wide selection of starting materials—with a large variety of physical and chemical properties—allows the tailoring of the design and synthesis of a very large number of linear, highly branched, and crosslinked polyurethane elastomers. In this chapter, preparation of polyurethane elastomers is discussed. This chapter also discusses the effects of various critical parameters, such as chemical composition, segment type, segment molecular weight, solubility parameters, and the nature and extent of hydrogen bonding on the morphology and properties of these materials. Although the focus will be on linear, segmented thermoplastic polyurethane/urea elastomers, this chapter also provides a discussion on the preparation and properties of hyperbranched and crosslinked polyurethane/urea elastomers.Publication Metadata only Solvent-free methods in nanocatalysis: from catalyst design to applications(Wiley-Vch Verlag, 2023) Luque, Rafael; Gawande, Manoj B.; Goswami, Anandarup; Department of Chemistry; Doustkhah, Esmail; Department of Chemistry; Koç University Tüpraş Energy Center (KUTEM) / Koç Üniversitesi Tüpraş Enerji Merkezi (KÜTEM); College of SciencesSolvent-Free Methods in Nanocatalysis Discover solvent-free approaches for the synthesis of nanocatalysts as well as various catalytic transformations in this unique one-stop resource Solvent-free methods have attracted wide attention in organic synthesis and catalysis as a promising approach towards "greener" and more sustainable chemical transformations. In this regard, nanocatalysis has seen particular growth in recent years. Solvent-Free Methods in Nanocatalysis gives an in-depth overview of nanocatalysts and their catalytic applications using solvent-free methods. After a brief introduction, it covers various synthetic techniques for the preparation of nanocatalysts and supports using solvent-free methods, e.g. ball-milling, microwave- and plasma-assisted methods. The book discusses in detail different catalyst classes, such as metal oxides, doped and functionalized nanocarbons, as well as nitride- and silica-based materials to help researchers to understand the efficiency and nature of these catalysts/supports based on their chemical structure. In the book readers will also find: • A brief account of the history, challenges, and recent advances in the field • Detailed discussion of advantages and disadvantages of solvent-free techniques for nanocatalyst preparation • Treatment of important solvent- and catalyst-free organic transformations (i.e. oxidation, coupling and multicomponent reactions) • A chapter on supported ionic liquids for solvent-free catalysis Written by leading researchers in the field, Solvent-Free Methods in Nanocatalysis is a useful reference for researchers and students working in organic synthesis, catalysis, and nanomaterials science. © 2023 WILEY-VCH GmbH, Boschstr. 12, 69469 Weinheim, Germany. All rights reserved.Publication Metadata only Nitride-based nanostructures for solvent-free catalysis(Wiley-Vch Verlag, 2023) Arlan, Fatemeh Majidi; El-Amir, Ahmed A.M.; El-Maddah, Amira A.; Torad, Nagy L.; Department of Chemistry; Doustkhah, Esmail; Department of Chemistry; Koç University Tüpraş Energy Center (KUTEM) / Koç Üniversitesi Tüpraş Enerji Merkezi (KÜTEM); College of SciencesNitride-based materials are the second most abundant binary materials after oxide materials. However, nitrides have more fascinating features and unexpected optical, electrical, mechanical, and even catalytic properties than oxides. In this chapter, we have reviewed and discussed the general properties, catalytic activities, and synthetic methods of some representative nitrides that have been utilized as catalysts in solvent-free organic reactions. Furthermore, we have elucidated the solvent-free and modification techniques of nitrides and their crystal structures, which play a key role in analyzing the materials' surface chemistry and stability. © 2023 WILEY-VCH GmbH.Publication Metadata only Preface(Wiley-Vch Verlag, 2023) Gawande, Manoj B.; Goswami, Anandarup; Luque, Rafael; Department of Chemistry; Doustkhah, Esmail; Department of Chemistry; Koç University Tüpraş Energy Center (KUTEM) / Koç Üniversitesi Tüpraş Enerji Merkezi (KÜTEM); College of SciencesPublication Metadata only Single-atom SN-loaded exfoliated layered titanate shows photocatalytic activity in hydrogen generation(NLM (Medline), 2023) Ide, Yusuke; Matsumoto, Hiroaki; Igarashi, Keisuke; Department of Chemistry; Üstünel, Tuğçe; Doustkhah, Esmail; Kaya, Sarp; Department of Chemistry; Koç University Tüpraş Energy Center (KUTEM) / Koç Üniversitesi Tüpraş Enerji Merkezi (KÜTEM); Graduate School of Sciences and Engineering; College of SciencesN/APublication Metadata only A novel magnetomechanical pump to actuate ferrofluids in minichannels(Begell House, Inc, 2011) Bilgin, Alp; Kurtoglu, Evrim; Erk, Hadi Cagdas; Sesen, Muhsincan; Kosar, Ali; Department of Chemistry; Acar, Havva Funda Yağcı; Faculty Member; Department of Chemistry; College of Sciences; 178902An improvement in the current methods of ferrofluid actuation was presented in this paper. A novel magnetomechanical microfluidic pump design was implemented with a ferrofluid as the active working fluid. Obtained flow rates were comparable to previous results in this research line. It was also seen that the basic pump architecture, which the subject pump is based on, enables much more room for further development.Publication Metadata only An experimental study on heat transfer performance of iron oxide based ferrofluids(ASME, 2012) Kaya, Alihan; Kurtoglu, Evrim; Kosar, Ali; Department of Chemistry; Acar, Havva Funda Yağcı; Faculty Member; Department of Chemistry; College of Sciences; 178902Nanofluids are colloidal compounds, where the solid phase material is composed of nano sized particles, and the liquid phase can potentially be any fluid but aqueous media are common. As a common nanofluid type, ferrofluids are formed by holding solid nanoparticles in suspension by weak intermolecular forces and may be produced from materials with different magnetic properties. Magnetite is one of the materials used for its natural ferromagnetic properties. Heat transfer performance of ferrofluids is one of the crucial properties among many others that should be analyzed and considered for their wide range of applications. For this purpose, experiments were conducted in order to characterize heat transfer properties of ironoxide based ferrofluids flowing through a microchannel. Promising results were obtained from this study, which are suggesting the use of ferrofluids for heat transfer applications can be advantageous.Publication Metadata only A coarse graining approach in molecular simulations: fuzzy potentials(Istanbul Technical University, 2003) Department of Chemistry; Department of Chemistry; Yurtsever, İsmail Ersin; Eşsiz, Şebnem; Faculty Member; Undergraduated Student; Department of Chemistry; College of Sciences; College of Sciences; 7129; 191615A new representation for interaction potential functions is presented. Unlike the orthodox approaches, the potential function is not a fixed function in terms of internuclear coordinates but a probabilistic one which contains information over a wide range of angular degrees of freedom. It is shown that such approaches can provide practical solutions for bulk systems of high density.Publication Metadata only Polyurethane synthesis revisited: effect of solvent and reaction conditions on prepolymer formation and polymer properties(American Chemical Society (ACS), 2014) N/A; Department of Chemistry; Department of Chemistry; Yıldırım, Armen; Yılgör, Emel; Yılgör, İskender; Master Student; Researcher; Faculty Member; Department of Chemistry; Koç University Surface Science and Technology Center (KUYTAM) / Koç Üniversitesi Yüzey Teknolojileri Araştırmaları Merkezi (KUYTAM); Koç University Surface Science and Technology Center (KUYTAM) / Koç Üniversitesi Yüzey Teknolojileri Araştırmaları Merkezi (KUYTAM); Koç University Surface Science and Technology Center (KUYTAM) / Koç Üniversitesi Yüzey Teknolojileri Araştırmaları Merkezi (KUYTAM); Graduate School of Sciences and Engineering; College of Sciences; College of Sciences; College of Sciences; College of Sciences; College of Sciences; N/A; 40527; 24181N/APublication Metadata only Influence of competitive hydrogen bonding between hard and soft segments on the properties of siloxane and polyether-based segmented copolymers.(Amer Chemical Soc, 1999) Department of Chemistry; Department of Chemistry; N/A; Yılgör, İskender; Burgaz, Engin; Metin, Burak; Yurtsever, İsmail Ersin; Yılgör, Emel; Faculty Member; Undergraduate Student; Undergraduate Student; Faculty Member; Researcher; Department of Chemistry; College of Sciences; College of Sciences; N/A; 24181; 17956; N/A; N/A; 40527N/A