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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 69: Focus: Fundamentals of molecular liquids, ionic liquids and mixtures II

CPP 69.2: Vortrag

Mittwoch, 18. März 2020, 15:30–15:45, ZEU 222

Dynamic Properties of Ion Jelly Studied by Dynamic Light Scattering and Dielectric Spectroscopy — •Jennifer Kraus, Florian Pabst, and Thomas Blochowicz — TU Darmstadt, Institut für Physik kondensierter Materie, Hochschulstr. 6, 64289, Darmstadt, Germany

Room temperature ionic liquids (RTILs) are molten salts liquid at room temperature, which are promising candidates for electrolytes in various electrochemical devices. For these electrolytes, however, a solid state would be desirable in terms of mechanical properties. Thus, the gelation of ionic liquids induced by polymers is one way to obtain a material with high conductivity despite a good mechanical strength, which is called ion jelly.

Mixing the ionic liquid 1-butyl-3-methylimmidazolium dicyanamide ([BMIM]⁺ [DCA]⁻) with gelatin and water, we study the dynamic properties of ion jelly by depolarized dynamic light scattering (DDLS) and broadband dielectric spectroscopy (BDS). While BDS is sensitive to ion conductive dynamics, DDLS measures the rotational dynamics of the optical anisotropic ions. By combining both methods we can disentangle the translational and rotational dynamics in neat [BMIM][DCA] and show that this dynamics is present nearly unchanged in the matrix of the ion jelly. However, DDLS measurements show that additional slow dynamic modes arise in the ion jelly which we tentatively ascribe to ions, which are slowed down in the proximity of the gelatin matrix.