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Collective Effects in Ionic Liquid [emim][Tf2N] and Ionic Paramagnetic Nitrate Solutions without Long-Range
Eni Kume1, Nicolas Martin1, Peter Dunne2
1Laboratoire Léon Brillouin (CEA-CNRS), Université Paris-Saclay, CEDEX, 91191 Gif-sur-Yvette, France.
Molecules (Basel, Switzerland)
|November 26, 2022
Summary
Ordinary liquids exhibit shear elasticity, a property also found in ionic liquids and nitrate solutions. These fluids resist shear stress, demonstrating collective effects under mechanical or magnetic fields.
Area of Science:
- Rheology
- Condensed Matter Physics
- Physical Chemistry
Background:
- Mesoscopic shear elasticity has been observed in ordinary liquids.
- This phenomenon is explained by reinforcing liquid/surface interfacial energy and nonextensive theoretical models.
- Elastic effects are being investigated in small molecules with strong electrostatic interactions.
Purpose of the Study:
- To examine shear elasticity in room temperature ionic liquids (RTILs) like [emim][Tf2N] and paramagnetic nitrate solutions.
- To determine if these charged fluids exhibit nonzero low-frequency shear elasticity.
- To understand the influence of magnetic properties on the structure of paramagnetic nitrate solutions.
Main Methods:
- Experimental investigation of shear elasticity at the submillimeter scale.
- Dynamic mechanical analysis (DMA).
- Neutron scattering studies.
Main Results:
- Room temperature ionic liquids and nitrate solutions exhibit nonzero low-frequency shear elasticity.
- These charged fluids demonstrate resistance to shear stress.
- Neutron scattering confirmed that magnetic properties do not induce structural formation in the paramagnetic nitrate solution.
Conclusions:
- Elastic correlations in liquids contribute to collective effects under external stress.
- This applies to both mechanical and magnetic fields, even in liquids not near phase transitions.
- Shear elasticity is a significant property in ionic liquids and paramagnetic solutions.
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