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Zinc Electrochemical Deposition from Ionic Liquids and Aqueous Solutions Onto indium tin oxide.
摘要： Ionic Liquids (ILs) are classified as green solvents and in this context, ILs offer the possibility to improve the electrodeposition processes of several metals or alloys, without involve the use of hazardous chemicals. In this work, we study the electrodeposition process of metallic zinc from the protic ionic liquid 2-hydroxyethyl ammonium propionate (2-HEAP) and from acidic aqueous solutions on indium tin oxide (ITO) as substrate. Electrodeposits obtained from 2-HEAP by using different zinc salts as a source of metallic ions are compared with electrodeposits obtained from aqueous solutions. Results show the influence of zinc salt and of the reaction media (2-HEAP or aqueous solutions) on the electrochemical reduction process and on the morphological properties of the deposits.
关键词： Zinc electrodeposition,Zn coatings,ITO,protic ionic liquids
更新于2025-09-10 09:29:36
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Modeling the Temperature Dependent Material Dispersion of Imidazolium Based Ionic Liquids in the Vis-NIR
摘要： A thorough analysis of the refractive index of eleven 1-alkyl-3-methylimidazolium based ionic liquids with three different anions, tetrafluoroborate BF4, bis(trifluoromethylsulfonyl)imide NTf2 and trifluoromethanesulfonate OTf, is reported. Refractive indices were estimated, in the temperature interval from 298.15 K to 323.15 K, using an Abbe refractometer to determine the value at the sodium D line and white light spectral interferometry to obtain dispersion in the range of wavelengths from 400 to 1000 nm. The first part of the manuscript is focused on the dependence of refractive index with wavelength, temperature, cation alkyl chain length and anion nature. Once the main features are detailed, and in order to explain the experimental trends, a model for the refractive index is considered where its square is expressed by a single resonance Sellmeier dispersion formula. This formula has two coefficients, the first one identifies the position of the resonance in the spectral axis, and the second one specifies its strength. It was found that, for a given compound, the resonance's position is independent of temperature, while the strength varies linearly with it. This model reproduces successfully the experimental data within the refractive index uncertainty. Furthermore, the model allows calculating the thermo-optic coefficient and its wavelength dependence.
关键词： ionic liquids,refractive index,thermo-optic coefficient
更新于2025-09-10 09:29:36
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Photopolymerization of Ionic Liquids – A Mutually Beneficial Approach for Materials Fabrication
摘要： Photopolymerization is a convenient fabrication technique with the power to control the polymerization in both time and space, be solvent free, and use simple equipment to initiate the polymerization reaction. These features are conditional on use of liquid monomers and crosslinkers that do not require solvent for processing. One class of compounds that provides these opportunities are ionic liquid (IL) monomers, which possess negligible vapour pressure and are free-flowing liquids at room temperature. For these reasons, ILs and photopolymerization are complementary to each other towards the fabrication of electrolyte materials by circumventing the innate difficulty in processing PILs as melts. Instead, the electrolyte polymer is formed as a crosslinked material directly where it will be used. In this review, we outline recent work demonstrating the key benefits of this unlikely marriage, including formulation design, applications in coatings, membranes, and others.
关键词： ionic liquids,membranes,coatings,UV-curing,Photopolymerization
更新于2025-09-09 09:28:46
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[Ceramic Transactions Series] Proceedings of the 12th Pacific Rim Conference on Ceramic and Glass Technology (Ceramic Transactions) || Dielectric Properties of Confined Ionic Liquids
摘要： Ionic liquids, as solvent free electrolytes, are promising materials improving the energy density of future storage devices. Two key requirements for such an application are a broad electrochemical window and a high ionic mobility of ionic liquids. A thorough measurement of the dielectric properties in a broad temperature and frequency regime allows analyzing the latter one in detail. Ionic mobility is influenced by intrinsic relaxations. These relaxations are influenced by correlation between the molecules. Confining the molecules allows to access this correlation length and to address the fundamental questions regarding supercooled liquids. We demonstrate this by confining the ionic liquid 1-butyl-3-methyl-imidazolium chloride in a metal-organic-framework, namely MFU-4. The preliminary results of an enhanced rotational motion compared to the bulk ionic liquid point towards a temperature, where the correlation length corresponds to the pore diameter of the confining host.
关键词： Ionic liquids,confinement,metal-organic-framework,BMIM-Cl,MFU-4,dielectric properties
更新于2025-09-04 15:30:14