Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 22 for “"green solvents"”.
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Synthesis and enzymatic resolution of amino acid esters in "green" solvents -- ionic liquids
… amino acids by enzymatic resolution using a "green" solvent, named an ionic liquid. Ionic liquids, a new type of "green" solvents, have been used in many organic reactions and other chemical processes (such as liquid-liquid extraction) with improved performance. This is mainly due to their …
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Synthesis of Chemically Stable VO2 Particles Using Green Solvents and their Application as Smart Coatings
… polymeric smart coatings using an economical and green chemistry approach, while examining the assemblies optical and thermal properties for potential application in smart windows. Water as a “green” solvent was examined in Ch. 2 using ammonium metavanadate as a low toxicity VO2 source, which was …
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Development of new visible-light mediated reactions
… impact methodologies and technologies (using green solvents and oxidants, one-pot reactions, visible light as an energy source, etc.). The research project focused on developing new methods for synthesizing amides and esters. These two functional groups are very important in organic chemistry …
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Investigation of Dibenzothiophene Removal from I Organic Phase: Enzymatic Approach vs. Ionic Liquids
… ionic liquids have emerged as attractive “green” solvents. Enzymes have also been reported previously for oxidation of organic sulfur compounds. In this study, two approaches were adopted for sulfur removal; first an enzymatic approach was attempted for sulfur oxidation. This approach was …
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Design and synthesis of new processable materials for application in organic devices.
… featuring ability to be processed from green solvents including alcohol or water. In the synthesis of semiconductor materials, the well-known diketopyrrolopyrrole (DPP) unit was used as main building block for its features as excellent electron-acceptor unit in compounds with low …
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Synthesis of α, β-Substituted Alkenylphosphonates from α-Phosphonovinyl Triflates: I) Palladium Catalyzed Suzuki-Miyaura Cross-coupling with Aryl Boronic Acids II) Palladium Catalyzed Reduction
… were completed using simple reaction conditions, green solvents (isopropyl alcohol/H<sub>2</sub>O), a heterogeneous catalyst with a very low mole loading (0.007%), and a benign base. The 1-aryl-1-alkenyl phosphonates were prepared in 72-98% yield after purification. Part II of this thesis …
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CHARACTERIZATION OF BIOLOGICALLY ACTIVE MOLECULES OFPHARMACOLOGICAL INTEREST EXTRACTED FROM MICROALGAE BYBIOSUSTAINABLE PROCESSES
… based on environmentally harmful organic solvents—limit their potential for large-scale industrial exploitation. In this context, the research carried out during my PhD program aimed to develop integrated strategies for the sustainable extraction of microalgal bioactive molecules, …
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Carbon-nitrogen bond-forming reactions in supercritical and expanded-liquid carbon dioxide media : green synthetic chemistry with multiscale reaction and phase behavior modeling
… syntheses and processing with cost-efficient, green solvents. The thermodynamics and reaction engineering characteristics associated with the synthesis of several model C-N bond-forming reactions were examined both experimentally and theoretically. Operating conditions and engineering …
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Environmentally friendly baths for Cu-Sn co-electrodeposition: cyanide-free aqueous bath and deep eutectic solvents
… It regards preparation of copper-tin alloys from green solvents for decorative purposes. Actual industrial process involves cyanide based complex bath in order to produce white bronze layers and they often contain lead as brightener and whitener. The aim of the thesis is to develop a more …
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Linker-based Lecithin Microemulsions as Transdermal Drug Delivery Systems
… co-surfactants. Recently, microemulsion-base “green solvents” were formulated with lecithin and linker molecules. The main objective of this dissertation was to test this concept of linker-based lecithin microemulsions in transdermal delivery. In the first part of this study, linker-based …
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Poliaspartiniai dažai metalinių ir medinių paviršių dangoms /
… are labeled as "VOC-free", a minimal amount of "green" solvents was used. Wood coatings should be more elastic, matte and soft, as well as sufficiently permeable to water so that the moisture in the wood can escape. Anti-corrosion coatings, on the contrary, must be as least permeable to water as …
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Phase behaviour of multicomponent systems from computer simulations
… biomolecular solutions and deep eutectic solvents, each having their own distinct characteristics and complexities. Firstly, we explore the process of biomolecular phase separation to form multicomponent biomolecular condensates, which are ubiquitous in cells and are crucial for the …
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Smart Re-Manufacturing of Recycled Plastics and Polymers using Sensor-based and High-throughput Experimentation Formats
… a need to identify environmentally benign (i.e., green) material formulations and processes for sustainable re-manufacturing based on smart manufacturing principles of sensing, automation, and data analytics. However, traditional approaches for process monitoring of plastic re-manufacturing …
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Deep Eutectic Solvents Synthesis, Characterization and Applications in Pretreatment of Lignocellulosic Biomass
<p>There has been an increased interest in green solvents and biofuels with the growing environmental awareness across the globe. Conventional methods of biofuel production involve the use of large quantities of molecular solvents and ionic liquids (ILs), but they have the drawbacks of high vapor …
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Dry milling characteristics and polyphenolic contents of adapted colored corn varieties and polyphenol extraction by combining deep eutectic solvents and ultrasound
… from plant matrices using a wide array of solvents. However, conventional extraction methods involve the use of organic solvents, which are of concern due to their adverse environmental impacts and generation of waste streams. Therefore, there is a growing demand for green solvents that are …
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On the fundamental mechanisms & optimisation of ultrasonic assisted liquid phase exfoliation of two dimensional nanomaterials
… (2D) materials. As of this date, toxic solvents such as N-Methyl-2-pyrrolidone (NMP) are commonly used for the production of graphene and other 2D layers. This research was intended to find a suitable eco-friendly liquid media alternative to NMP, such as water or water-based solutions …
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Multi-techniques Characterization of Mechanochemically Synthesized Deep Eutectic Solvents
… eutectic solvent (DES) is the alternative and greener solvent in which two compounds, usually a hydrogen bond acceptor (HBA) and a hydrogen bond donor (HBD), are used. Two components form a complex network with strong intermolecular forces and show a lower melting point than those of the …
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Application of physicochemical and biological pretreatments to enhance volatile fatty acids production via Dark Fermentation from agri-food waste
In the field known as the Green Economy, one of the most important pillars for developing a future, more sustainable production model is the incorporation of sustainable production processes as substitutes for conventional ones. In this regard, Volatile Fatty Acids (VFAs) constitute the so-called …
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