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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
121

Characterizing Interactions of Ionic Liquid Based Electrolytes with Electrospun Gas Diffusion Electrode Frameworks by 1H PFG NMR

Merz, Steffen, Jakes, Peter, Tempel, Hermann, Weinrich, Henning, Kungl, Hans, Eichel, Rüdiger-A., Granwehr, Josef 11 September 2018 (has links)
Pulsed field gradient (PFG) 1H NMR was used to characterize the mobility of ionic liquid cations in porous gas diffusion electrode (GDE) frameworks for metal–air electrochemical systems. The carbon GDE frameworks were produced by electrospinning. It was found that the motion of ionic liquids in the highly porous hosts is more complex than what is commonly exhibited by conventional fluids, which makes a multimodal investigation essential for an adequate description of mobility and wetting of GDEs. Observed NMR diffraction-like patterns cannot be linked to the tortuosity limit but may serve as a proxy for structural features in the fibrous material. While the observed data were interpreted using standard theoretical models, alternative explanations and causes for artifacts are discussed.
122

Viologen-nucleobase derivatives: building blocks for functional materials

Ciobanu, Marius 04 May 2015 (has links)
The main subject of this thesis is the synthesis and investigation of the properties and potential applications of a new class of hybrid compounds consisting of a rigid, electroactive 4,4’-bipyridinium core capped by nucleobase terminal groups with hydrogen bonding abilities. A new series of small molecules consisting in a 4,4’-bipyridinium unit carrying thymine or/and adenine as capping groups was synthetized. The synthesis strategy implied the regioselective alkylation of thymine and adenine bases respectively, followed by coupling of the alkylated precursors to 4,4’-bipyridine unit via Menschutkin reaction. Electrochemical, spectroelectrochemical and optical investigations revealed an intramolecular charge transfer (CT) relationship between nucleobases as donors and 4,4’-bipyridinium unit as acceptor which is accompanied by a change in color and a shift of the reduction potentials (approx. 60 mV). The viologen-nucleobase derivatives, particularly viologens capped by thymine, were used as building blocks to create self-assembled functional nanostructures in the presence of complementary templates such as oligonucleotides or ssPNA analogues via thymine-adenine interactions. The viologen-thymine derivatives were found to partially precipitate oligonucleotides or plasmid DNA by mean of coulombic interactions and form stable polyplexes that could be used as potential gene delivery vectors. It was found that the number of positive charges, as well as the number of thymine units per viologen-thymine derivative determines whether the interaction with DNA is dominated by electrostatic or by hydrogen bonding interactions. New electroactive ionic liquid crystals were prepared by ion pairing of viologen-nucleobase dicationic species with amphiphilic 3,4,5-tris(dodecyloxy)benzene sulfonate anion. The nucleobases with ability to self-associate by hydrogen bonding were found to influence not just the thermotropic behavior, by decreasing transition temperature from crystalline to mesophase state, but also the supramolecular arrangement in solution. A versatile approach to functionalize mesoporous TiO2 film with viologen-nucleobase derivatives was developed consisting of hydrogen bonding layer-by-layer deposition of viologen-nucleobase derivatives on TiO2 surface using the thymine-adenine molecular recognition as driving force for immobilization. This method is promising and represents an easy way to construct optoelectronic device components as was demonstrated with the construction of a switchable electrochromic device.
123

Introduction of Ionic Liquids into Metal-Organic Frameworks and Their Phase Behavior and Ionic Conductivity / 金属有機構造体へのイオン液体の導入およびその相挙動とイオン伝導性

Fujie, Kazuyuki 23 March 2016 (has links)
京都大学 / 0048 / 新制・論文博士 / 博士(理学) / 乙第12997号 / 論理博第1553号 / 新制||理||1604(附属図書館) / 32925 / (主査)教授 北川 宏, 教授 竹腰 清乃理, 教授 有賀 哲也 / 学位規則第4条第2項該当 / Doctor of Science / Kyoto University / DGAM
124

A Study on Sodium Secondary Batteries Using Ionic Liquid as Electrolytes / イオン液体を電解質に用いたナトリウム二次電池に関する研究

Fukunaga, Atsushi 23 March 2016 (has links)
京都大学 / 0048 / 新制・課程博士 / 博士(エネルギー科学) / 甲第19821号 / エネ博第327号 / 新制||エネ||66(附属図書館) / 32857 / 京都大学大学院エネルギー科学研究科エネルギー基礎科学専攻 / (主査)教授 萩原 理加, 教授 佐川 尚, 教授 野平 俊之 / 学位規則第4条第1項該当 / Doctor of Energy Science / Kyoto University / DFAM
125

A study on tin-based negative electrode materials for sodium secondary batteries using Na[FSA]-K[FSA] inorganic ionic liquid / Na[FSA]-K[FSA]無機イオン液体を用いたナトリウム二次電池用スズ系負極材料に関する研究

Yamamoto, Takayuki 23 March 2016 (has links)
京都大学 / 0048 / 新制・課程博士 / 博士(エネルギー科学) / 甲第19822号 / エネ博第328号 / 新制||エネ||66(附属図書館) / 32858 / 京都大学大学院エネルギー科学研究科エネルギー基礎科学専攻 / (主査)教授 萩原 理加, 教授 佐川 尚, 教授 野平 俊之 / 学位規則第4条第1項該当 / Doctor of Energy Science / Kyoto University / DGAM
126

ION SOLVATION, MOBILITY AND ACCESSIBILITY IN IONIC LIQUID ELECTROLYTES FOR ENERGY STORAGE

Huang, Qianwen 23 May 2019 (has links)
No description available.
127

Membrane Drying of Ionic Liquid

Du, Xi January 2012 (has links)
No description available.
128

Biochemical Saccharification of Ionic Liquid Pretreated Biomass: an Examination of Treatment Parameters and Enzyme Requirements

Barr, Christopher James 26 November 2013 (has links)
No description available.
129

Microwave Assisted Chemical Etching of β-Ga2O3

Sowers, Elizabeth Ann 15 May 2023 (has links)
No description available.
130

Structural feature based computational approach of toxicity prediction of ionic liquids: Cationic and anionic effects on ionic liquids toxicity

Salam, M.A., Abdullah, B., Ramli, A., Mujtaba, Iqbal M. 01 October 2016 (has links)
yes / The density functional theory (DFT) based a unique model has been developed to predict the toxicity of ionic liquids using structural-feature based quantum chemical reactivity descriptors. Electrophilic indices (ω), the energy of highest occupied (EHOMO) and lowest unoccupied molecular orbital, (ELUMO) and energy gap (∆ E) were selected as the best toxicity descriptors of ILs via Pearson correlation and multiple linear regression analyses. The principle components analysis (PCA) demonstrated the distribution and inter-relation of descriptors of the model. A multiple linear regression (MLR) analysis on selected descriptors derived the model equation for toxicity prediction of ionic liquids. The model predicted toxicity values and mechanism are very consistent with observed toxicity. Cationic and side chains length effect are pronounced to the toxicity of ILs. The model will provide an economic screening method to predict the toxicity of a wide range of ionic liquids and their toxicity mechanism.

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