First Studies on the Influence of Methylated β-Cyclodextrin on the Rheological Behavior of 1-Ethyl-3-methyl Imidazolium Acetate
| Autor: | Martin W. Hetzer, Werner-Michael Kulicke, Nina Gonsior, Helmut Ritter |
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| Rok vydání: | 2010 |
| Předmět: |
Methylated β cyclodextrin
Rotation Electrolyte Physics::Fluid Dynamics symbols.namesake Rheology Materials Chemistry Shear stress Organic chemistry Physical and Theoretical Chemistry Arrhenius equation Shear thinning Oscillation Chemistry beta-Cyclodextrins Imidazoles Temperature Surfaces Coatings and Films Solutions Condensed Matter::Soft Condensed Matter symbols Thermodynamics Physical chemistry Gels Logarithmic form |
| Zdroj: | The Journal of Physical Chemistry B. 114:12468-12472 |
| ISSN: | 1520-5207 1520-6106 |
| DOI: | 10.1021/jp1036684 |
| Popis: | The rheology of solutions of randomly methylated (1.8) β-cyclodextrin (β-CD) in 1-ethyl-3-methyl imidazolium acetate ([EMIM][Ac]) was studied in detail by rotational and oscillatory shear measurements. It was found that a gel structure was formed even at a relatively low β-CD concentration, which induced intriguing results in oscillation experiments. The solutions showed abrupt changes of the structurally dependent rheological moduli and reproducible transitions from gel to sol state at specific shear stress. For all β-CD solutions, a non-Newtonian flow behavior including shear thinning was obtained. The influence of temperature and β-CD concentration on the flow behavior was studied for all solutions, and the flow activation energies were calculated from the logarithmic form of the Arrhenius equation for nonassociating electrolytes. |
| Databáze: | OpenAIRE |
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