Nonlinear ion transport in liquid and solid electrolytes

Roling, Bernhard; Patro, L.N.; Burghaus, Olaf; Gräf, Melanie

doi:10.1140/epjst/e2017-70073-9

Cited by 10 publications

(12 citation statements)

References 42 publications

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“…Changing the character of the disorder in the surrounding matrix, and the interactions between mobile particles when their concentration increases, and between particle species of strongly different mobility, the relevant time-dependent correlation functions and susceptibilities are determined in simulations and analytical models. This provides insights into the transport of binary mixtures studied by confocal microscopy [2] and to (transient) conductivity measurements [6]. Micro-rheology in dense granular fluids also records spatial correlations around pulled intruders [5].…”

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confidence: 91%

“…Glass transitions in confinement are also analyzed extending mode-coupling theory, which adds to the picture about anomalous transport in confined systems. Nonlinear conductivities, already considered by theoretical approaches in reference [4], are picked up in the the report by Roling and coworkers from the experimental perspective [6]. Comparing to the well-understood phenomena in diluted electrolyte solutions, novel investigations of the nonlinear ionic conductivity of supercooled ionic liquids are presented and discussed.…”

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confidence: 99%

“…Therefore all manuscripts collected here relate to this issue. It has a particular importance for the experimental nonlinear spectroscopy performed using mechanical [1,2] and electrical fields [6,9]. The leading higher-harmonic contributions in large amplitude oscillatory shearing in the dielectric susceptibility and the conductivity are measured experimentally as a function of the magnitude of the external field, which has to be controlled accurately.…”

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confidence: 99%

“…The motion of an intruder in a two-dimensional dense granular fluid is analyzed, which is also addressed using a continuous-time random-walk analysis and simulations in reference [4] of this issue. Conductivity measurements in ionic liquids under an applied dc field require careful tuning of the experimental parameters in order to prevent electrochemical degrading the sample [6]. The results can be interpreted using computer simulations on ionic transport in model systems of disordered media [7] and simulations of binary charged mixtures [4].…”

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Recent advances on glass-forming systems driven far from equilibrium

Fuchs

2017

Eur. Phys. J. Spec. Top.

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Abstract. The nature of the glass transition is one of the frontier questions in Statistical Physics and Materials Science. Highly cooperative structural processes develop in glass-forming melts exhibiting relaxational dynamics which is spread out over many decades in time. While considerable progress has been made in recent decades towards understanding dynamical slowing-down in quiescent systems, the interplay of glassy dynamics with external fields reveals a wealth of novel phenomena yet to be explored.This special issue focuses on recent results obtained by the Research Unit FOR 1394 'Nonlinear response to probe vitrification' which was funded by the German Science Foundation (DFG). In the projects of the research unit, strong external fields were used in order to gain insights into the complex structural and transport phenomena at the glass transition under far-fromequilibrium conditions. This aimed inter alia to test theories of the glass transition developed for quiescent systems by pushing them beyond their original regime. Combining experimental, simulational, and theoretical efforts, the eight projects within the FOR 1394 measured and determined aspects of the nonlinear response of supercooled metallic, polymeric, and silica melts, of colloidal dispersions, and of ionic liquids. Applied fields included electric and mechanic fields, and forced active probing ('micro-rheology'), where a single probe is forced through the glass-forming host. Nonlinear stressstrain and force-velocity relations as well as nonlinear dielectric susceptibilities and conductivities were observed. While the physical manipulation of melts and glasses is interesting in its own right, especially technologically, the investigations performed by the FOR 1394 suggest to use the response to strong homogeneous and inhomogeneous fields as technique to explore on the microscopic level the cooperative mechanisms in dense melts of strongly interacting constituents.Questions considered concern the (de-)coupling of different dynamical degrees of freedom in an external field, and the ensuing state a

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confidence: 99%

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Recent advances on glass-forming systems driven far from equilibrium

Fuchs

2017

Eur. Phys. J. Spec. Top.

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“…In this nonlinear regime higher-order conduction effects start playing a significant role. 17 Although nonlinear effects in viscous liquids have recently gained a large interest in the glass community, 18 their investigation for the case of conducting materials is scarce, with a focus on ionic liquids 19,20,21,22,23 and solid (glassy) ionic conductors 24,25 These studies reveal fascinating phenomena, not accessible via linear investigations: dynamically heterogeneous charge transport, 24 compliance with the reverse calorimetry concept, 19 accessibility of effective ionic jump lengths, 20 the emergence of "hump" features in the third-order conductivity spectra, 23 and anomalous Wien effects 22,26 for ionic liquids. To the best of our knowledge, such investigations are lacking for the scientifically and technologically highly relevant polymeric materials.…”

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Transient Nonlinear Response of Dynamically Decoupled Ionic Conductors

et al. 2018

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The present study demonstrates that large electric fields progressively enhance the conductivity of ionic systems up to timescales corresponding to those on which their structural rearrangements take place. Yet, in many ionic materials, some regarded as candidates for electrical energy storage applications, the structural relaxation process can be tremendously slower than (or highly decoupled from) the charge fluctuations. Consequently, nonlinear dielectric spectroscopy may be employed to access rheological information in dynamically decoupled ionic conductors, whereas the combination of large electric power density and good mechanical stability, both technologically highly desired, imposes specific experimental constraints to reliably determine the steady-state conductivity of such materials.

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