Helsingfors universitet

Ionic liquids thesis. "Synthesis and applications of imidazolium-based ionic liquids and thei" by Woon Su Oh

We also like to use complex coacervate core micelles. For the shorter chain phosphonium ionic liquids with DMSO and GVL, upper critical solution temperature behaviour was observed and explored in more detail. Section 1 describes the modulating effect of the imidazolium based room temperature ionic liquids RTILs on the critical micelle concentrations CMC of surfactants. In this case the complexation of oppositely charged polyelectrolytes drives the self-assembly resulting in a polymer-rich core. The low volatility of the ionic liquids compared to amines, such as monoethanolamine MEA how to make a essay hook, which are currently used in CO2 gas capture technologies, make them an attractive area of research. It was found that these organic electrolyte solutions were very effective solvents for cellulose, with a high molar dissolution capacity. The phase behaviour of hydrophobic phosphonium ionic liquids, DMSO, and water was studied and applied to the recovery of the ionic liquid after cellulose dissolution in the electrolyte solutions.

Contents

Education & Programmes

Methods to make emulsions Ultratorax, micro-fluid devices Methods to determine the size and stability of emulsions light scattering, microscopy Methods to study emulsifiers Langmuir tough, Whilhelmy plate tensiometers. The phase behaviour of hydrophobic phosphonium ionic liquids, DMSO, and water was studied and applied to the recovery of the ionic liquid after cellulose dissolution in the electrolyte solutions.

Of course the oil company is only interested in the oil and is keen to separate the water from the oil. The results show a new methodology of eutectic mixtures acting as template delivery agents through the slow, in situ decomposition of the urea derivative of the eutectic mixture.

Research & Results

The ionic liquids were used to dissolve lignin, and were found only to dissolve cellulose upon addition of a polar aprotic molecular solvent, such as DMSO dimethylsulfoxide. In an attempt to squeeze out more oil from a reservoir, one nowadays considers to pump surfactants down in a well. The partitioning of cover letter sample for business visa application surfactants from the oil-water interface into the IL and replacing a co-ion from the IL, or incorporating a counter-ion effects in the coarsening of the oil-water emulsion.

An ionic liquid or eutectic mixture is to act as both the organic template and the solvent, hence eliminating the space filling effects in the reaction from the water.

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CMC values decrease with increasing alkyl chain-length and with fluorinated side chains on the imidazole moiety. At the greatest extent, only one mole of ionic liquid per glucose units in cellulose is needed to dissolve cellulose. The addition of cobalt into the aluminophosphate framework was investigated and resulted in three different cobalt-aluminophosphates being synthesised, including one new zeolite framework.

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The role of the cation and anion in the dissolution process is explored, with the aid of solvent parametisation techniques and NMR studies. The use of these anions resulted in the production of several different one and two-dimensional structures.

BSc & MSc - Ionic liquids for smart separations - WUR

In these solutions, cellulose is only soluble at high temperatures, and reforms human resources executive cover letter low temperatures to form a gel with a spherical literature review on cvt morphology. Divine comedy thesis last category of ionic liquids, are those which contain a phosphonium cation trioctyl quaternised with a number of groups containing different functionalities for different potential applications.

In particular a pyrrole functionalised quaternary phosphonium salt was successfully polymerised. Preliminary investigations have also been started into the effects of changing the ionic liquid anion from bromide to phosphorus hexafluoride and bis trifluoromethyl sulfonyl amide.

Helsingin yliopisto

The use of eutectic mixtures as solvent and template was also investigated as a cheaper, more easily synthesised solvent than the ionic liquids. For a mild but efficient extraction, small drops are desired. Through Grubbs' catalyst mediated ring opening metathesis polyhmerization ROMPwe were able to obtain oligomers of the polynorbornene-imidazolium salts, which are potentially useful critical thinking questions for high school english gel-polymer electrolytes in lithium ion batteries, ionic liquids thesis in the preparation of Ag nanowires and carbon nanotubes"--Abstract, page iii.

In the case of ionic surfactants, we are keen to strip the surfactants from the oil-water interface by confronting an oil-in-water emulsion with a IL-in-water emulsion. The first category consist of cations which contain two N-heterocyclic rings and these are combined with a range of conventional anions such as bis triflimide and dicyanamide.

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This synthesis method resulted in the formation of nine one and two-dimensional aluminophosphates. At present we are in the process of starting up a PhD project on this topic.

"Synthesis and applications of imidazolium-based ionic liquids and thei" by Woon Su Oh

At room temperature they are in the liquid state, because the charged groups are attached to low molar weight hydrophobic moieties. A preliminary operational evaluation was conducted to examine anionic and cationic effects, as well as temperature and ionic liquid content of the impregnated MCM silica.

The low volatility of the ionic liquids compared to amines, such as monoethanolamine MEAwhich are currently used in CO2 gas capture technologies, make them an attractive area of research. This is combined with a classical stopping mechanism, that is, uncharged polymer moieties accumulate in a corona brush that surrounds the sample application letter for deped coacervate core.

ILs have a solubility gap with many liquids, including both water and oil, and therefore can be used to extract components from such solutions.

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Breaking emulsions is not an easy task. Amino acid ionic liquids were immobilised onto a mesoporous silica MCM and their CO2 absorption capability was investigated. Experiments were carried out into the effect of altering the imidazolium cation alkyl chain.

Imidazolium ionic liquids containing conventional anions were immobilised onto a polymeric support, why i love him essay which gases which are found in flue gas systems such as CO2 and N2, are passed through the membrane.

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They may become involved in i the search of such emulsions. These preliminary comparative permeability studies were confined to the first category of ionic liquids due to their lower viscosity and previous literature precedent of these anion types being used for these systems.

Ionic Liquids and Electrolytes for Cellulose Dissolution

In contrast to the classical surfactant systems where hydrophobic interactions are the reason for self-assembly, the C3M's are more adaptive, as they can respond to pH and ionic strength. Three distinct categories of ionic liquids were synthesised, two of which are imidazolium based, with the latter category based on the phosphonium cations. It may also be important to know iii the phase behavior of ILs in the presence of oil or water.