Untersuchungen des Flüssig-Flüssig Phasenübergangs von Lösungen Ionischer Flüssigkeiten mit dem Trifluormethylsulfonat-Anion:
Ionic Liquids, phase diagrams, critical properties, Corresponding state,Cross-over, Viskosity,refractive index, Light scattering. - Phase separations of solutions of ionic liquids of the type Alkylmethylimidazolium Trifluoromethylsulfonate (Cnmimtfo) with different lengths of alkyl side chains (n=4,...
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| Format: | Abschlussarbeit Elektronisch E-Book |
| Sprache: | German |
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2011
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| Zusammenfassung: | Ionic Liquids, phase diagrams, critical properties, Corresponding state,Cross-over, Viskosity,refractive index, Light scattering. - Phase separations of solutions of ionic liquids of the type Alkylmethylimidazolium Trifluoromethylsulfonate (Cnmimtfo) with different lengths of alkyl side chains (n=4,5,6,7,8) were investigated in a large set of solvents. The investigations of liquid-liquid demixing were carried out in water, polar and non-polar organic solvents with the aim of finding systems with critical solution points at ambient conditionsCritical points in the range accessible with a water thermostat were found for solutions in water, dioxane and weakly polar arene-halides. Phase diagrams were measured for those systems. The phase diagrams were analyzed with a function that presumes Ising critical behavior and takes the asymmetry of the phase diagrams into account. The function describes the data very good with a minimal set of parameter, thus stating Ising criticality for the ionic solutions. The plot of all the phase diagrams in reduced variables is general agreement with the theorem of corresponding states. The phase diagrams were analyzed with model system of charged hard spheres in a dielectric continuum (restricted primitive model; RPM) The RPM critical temperatures of all investigated systems depend linearly on the dielectric constant of the solvents. After investigating the phase diagrams, two systems were selected (C6mimtfo-Chlorobenzene and C8mimtfo-4Chlortoluol) for precise studies of the critical behavior by measurements of viscosity, refractive index, the static and dynamic light scattering and theoretical analysis. Samples with critical composition were prepared and investigated with mK-accuracy. For both systems refractive index measurements were performed in the one-and two-phase region. From the refractive indices, the Lorentz-Lorenz functions w++ ere calculated and analyzed as function of the volume-, mole- and mass fraction and the RPM-densities. The analysis of the temperature dependence of the difference between the concentrations in the upper and lower phase shows for all variables Ising behavior with deviations indicating normal crossover to mean-field criticality. The analysis of the diameter shows the non-analytic behavior expected from the theory of "complete scaling". The temperature dependence of the viscosity also shows non-classical behavior, when approaching the critical point. To highlight the critical contributions to the viscosity, the measured viscosity was divided by the background viscosity. For correcting the influence of shear effects on the viscosity the theories of Oxtoby and Onuki were used. The corrected data were analyzed with the crossover theory of Bhattacharjee. The analysis showed for both systems Ising behavior with a normal crossover. In light-scattering experiments the scattering intensities and the intensity-correlation functions were measured as function of temperature and scattering angles. The scattering intensities (static light-scattering) were analyzed as function of temperature with the Ornstein-Zernike function, and as function of the scattering angle with the Ornstein-Zernike plot. The intensities were ... |
| Beschreibung: | 1 Online-Ressource |
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| 245 | 1 | 0 | |a Untersuchungen des Flüssig-Flüssig Phasenübergangs von Lösungen Ionischer Flüssigkeiten mit dem Trifluormethylsulfonat-Anion |c von Abdalla Omar O. Elshwishin |
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| 520 | 8 | |a Ionic Liquids, phase diagrams, critical properties, Corresponding state,Cross-over, Viskosity,refractive index, Light scattering. - Phase separations of solutions of ionic liquids of the type Alkylmethylimidazolium Trifluoromethylsulfonate (Cnmimtfo) with different lengths of alkyl side chains (n=4,5,6,7,8) were investigated in a large set of solvents. The investigations of liquid-liquid demixing were carried out in water, polar and non-polar organic solvents with the aim of finding systems with critical solution points at ambient conditionsCritical points in the range accessible with a water thermostat were found for solutions in water, dioxane and weakly polar arene-halides. Phase diagrams were measured for those systems. The phase diagrams were analyzed with a function that presumes Ising critical behavior and takes the asymmetry of the phase diagrams into account. The function describes the data very good with a minimal set of parameter, thus stating Ising criticality for the ionic solutions. The plot of all the phase diagrams in reduced variables is general agreement with the theorem of corresponding states. The phase diagrams were analyzed with model system of charged hard spheres in a dielectric continuum (restricted primitive model; RPM) The RPM critical temperatures of all investigated systems depend linearly on the dielectric constant of the solvents. After investigating the phase diagrams, two systems were selected (C6mimtfo-Chlorobenzene and C8mimtfo-4Chlortoluol) for precise studies of the critical behavior by measurements of viscosity, refractive index, the static and dynamic light scattering and theoretical analysis. Samples with critical composition were prepared and investigated with mK-accuracy. For both systems refractive index measurements were performed in the one-and two-phase region. From the refractive indices, the Lorentz-Lorenz functions w++ | |
| 520 | 8 | |a ere calculated and analyzed as function of the volume-, mole- and mass fraction and the RPM-densities. The analysis of the temperature dependence of the difference between the concentrations in the upper and lower phase shows for all variables Ising behavior with deviations indicating normal crossover to mean-field criticality. The analysis of the diameter shows the non-analytic behavior expected from the theory of "complete scaling". The temperature dependence of the viscosity also shows non-classical behavior, when approaching the critical point. To highlight the critical contributions to the viscosity, the measured viscosity was divided by the background viscosity. For correcting the influence of shear effects on the viscosity the theories of Oxtoby and Onuki were used. The corrected data were analyzed with the crossover theory of Bhattacharjee. The analysis showed for both systems Ising behavior with a normal crossover. In light-scattering experiments the scattering intensities and the intensity-correlation functions were measured as function of temperature and scattering angles. The scattering intensities (static light-scattering) were analyzed as function of temperature with the Ornstein-Zernike function, and as function of the scattering angle with the Ornstein-Zernike plot. The intensities were ... | |
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| spelling | Elshwishin, Abdulla Omar O. Verfasser (DE-588)1021287954 aut Untersuchungen des Flüssig-Flüssig Phasenübergangs von Lösungen Ionischer Flüssigkeiten mit dem Trifluormethylsulfonat-Anion von Abdalla Omar O. Elshwishin 2011 1 Online-Ressource txt rdacontent c rdamedia cr rdacarrier Bremen, Univ., Diss., 2011 Ionic Liquids, phase diagrams, critical properties, Corresponding state,Cross-over, Viskosity,refractive index, Light scattering. - Phase separations of solutions of ionic liquids of the type Alkylmethylimidazolium Trifluoromethylsulfonate (Cnmimtfo) with different lengths of alkyl side chains (n=4,5,6,7,8) were investigated in a large set of solvents. The investigations of liquid-liquid demixing were carried out in water, polar and non-polar organic solvents with the aim of finding systems with critical solution points at ambient conditionsCritical points in the range accessible with a water thermostat were found for solutions in water, dioxane and weakly polar arene-halides. Phase diagrams were measured for those systems. The phase diagrams were analyzed with a function that presumes Ising critical behavior and takes the asymmetry of the phase diagrams into account. The function describes the data very good with a minimal set of parameter, thus stating Ising criticality for the ionic solutions. The plot of all the phase diagrams in reduced variables is general agreement with the theorem of corresponding states. The phase diagrams were analyzed with model system of charged hard spheres in a dielectric continuum (restricted primitive model; RPM) The RPM critical temperatures of all investigated systems depend linearly on the dielectric constant of the solvents. After investigating the phase diagrams, two systems were selected (C6mimtfo-Chlorobenzene and C8mimtfo-4Chlortoluol) for precise studies of the critical behavior by measurements of viscosity, refractive index, the static and dynamic light scattering and theoretical analysis. Samples with critical composition were prepared and investigated with mK-accuracy. For both systems refractive index measurements were performed in the one-and two-phase region. From the refractive indices, the Lorentz-Lorenz functions w++ ere calculated and analyzed as function of the volume-, mole- and mass fraction and the RPM-densities. The analysis of the temperature dependence of the difference between the concentrations in the upper and lower phase shows for all variables Ising behavior with deviations indicating normal crossover to mean-field criticality. The analysis of the diameter shows the non-analytic behavior expected from the theory of "complete scaling". The temperature dependence of the viscosity also shows non-classical behavior, when approaching the critical point. To highlight the critical contributions to the viscosity, the measured viscosity was divided by the background viscosity. For correcting the influence of shear effects on the viscosity the theories of Oxtoby and Onuki were used. The corrected data were analyzed with the crossover theory of Bhattacharjee. The analysis showed for both systems Ising behavior with a normal crossover. In light-scattering experiments the scattering intensities and the intensity-correlation functions were measured as function of temperature and scattering angles. The scattering intensities (static light-scattering) were analyzed as function of temperature with the Ornstein-Zernike function, and as function of the scattering angle with the Ornstein-Zernike plot. The intensities were ... (DE-588)4113937-9 Hochschulschrift gnd-content https://nbn-resolving.org/urn:nbn:de:gbv:46-00102457-18 Verlag kostenfrei Volltext |
| spellingShingle | Elshwishin, Abdulla Omar O. Untersuchungen des Flüssig-Flüssig Phasenübergangs von Lösungen Ionischer Flüssigkeiten mit dem Trifluormethylsulfonat-Anion |
| subject_GND | (DE-588)4113937-9 |
| title | Untersuchungen des Flüssig-Flüssig Phasenübergangs von Lösungen Ionischer Flüssigkeiten mit dem Trifluormethylsulfonat-Anion |
| title_auth | Untersuchungen des Flüssig-Flüssig Phasenübergangs von Lösungen Ionischer Flüssigkeiten mit dem Trifluormethylsulfonat-Anion |
| title_exact_search | Untersuchungen des Flüssig-Flüssig Phasenübergangs von Lösungen Ionischer Flüssigkeiten mit dem Trifluormethylsulfonat-Anion |
| title_full | Untersuchungen des Flüssig-Flüssig Phasenübergangs von Lösungen Ionischer Flüssigkeiten mit dem Trifluormethylsulfonat-Anion von Abdalla Omar O. Elshwishin |
| title_fullStr | Untersuchungen des Flüssig-Flüssig Phasenübergangs von Lösungen Ionischer Flüssigkeiten mit dem Trifluormethylsulfonat-Anion von Abdalla Omar O. Elshwishin |
| title_full_unstemmed | Untersuchungen des Flüssig-Flüssig Phasenübergangs von Lösungen Ionischer Flüssigkeiten mit dem Trifluormethylsulfonat-Anion von Abdalla Omar O. Elshwishin |
| title_short | Untersuchungen des Flüssig-Flüssig Phasenübergangs von Lösungen Ionischer Flüssigkeiten mit dem Trifluormethylsulfonat-Anion |
| title_sort | untersuchungen des flussig flussig phasenubergangs von losungen ionischer flussigkeiten mit dem trifluormethylsulfonat anion |
| topic_facet | Hochschulschrift |
| url | https://nbn-resolving.org/urn:nbn:de:gbv:46-00102457-18 |
| work_keys_str_mv | AT elshwishinabdullaomaro untersuchungendesflussigflussigphasenubergangsvonlosungenionischerflussigkeitenmitdemtrifluormethylsulfonatanion |