Charging dynamics of an individual nanopore

Tivony, Ran; Safran, S. A.; Pincus, P.; Silbert, Gilad; Klein, Jacob

doi:10.1038/s41467-018-06364-1

Cited by 53 publications

(66 citation statements)

References 50 publications

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“…Measurement of the surface force in response to a suddenly applied voltage has been performed by Tivony et al [20] in a similar surface force balance. They investigate the charging dynamics of a dilute electrolyte in the case of very narrow electrode separation, mimicking charging in nanopores.…”

Section: Comparison To Experimentsmentioning

confidence: 99%

“…They attribute the increased time scale to ion migration from the reservoir outside the thin gap between the two charged surfaces in their apparatus. This transport process, therefore, involves ionic fluxes that are not solely normal to the electrode surfaces and is represented as a transmission line model in [20]. We consider a closed, one-dimensional system, where there is no transport of ions beyond the gap between the electrodes.…”

Section: Comparison To Experimentsmentioning

confidence: 99%

“…State of the art experimental techniques [4,11] use it to analyze measurements of the force between charged surfaces. The DLVO theory needs * bbalu@andrew.cmu.edu modification to account for dynamic interactions that may arise due to charge regulation [12][13][14], electrokinetic particle motion [15][16][17], and external charging of electrochemical cells [7,[18][19][20]. Research on charge regulation models focuses on systems in quasiequilibrium; i.e., the ions in the electrolyte reach their equilibrium distribution much faster than a charge regulating reaction on the surface.…”

Section: Introductionmentioning

confidence: 99%

“…Recent surface force apparatus experiments by Perez-Martinez and Perkin [7] externally apply an oscillating voltage and simultaneously measure the time-dependent surface force between two electrodes across an electrolyte solution. Tivony et al [20] measure the time-dependent surface force due to a suddenly applied, or step, voltage in a similar apparatus. Motivated by these recent studies, here we develop a theoretical model for the "dynamic double layer force" between two surfaces whose potential difference oscillates in time.…”

Section: Introductionmentioning

confidence: 99%

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Dynamic double layer force between charged surfaces

Balu

Khair

2020

Phys. Rev. Research

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We develop a theory for the "dynamic double layer force" between charged surfaces in an electrolyte under a time-dependent voltage. Specifically, the force between two planar surfaces is calculated within the Poisson-Nernst-Planck framework for dilute electrolytes, accounting for unequal ionic diffusivities. Due to the inherent nonlinear dependence of the force on the electric potential, a sinusoidal voltage oscillating with frequency ω gives rise to a nonzero time-averaged force, along with a component oscillating with frequency 2ω. The timeaveraged force is always attractive, as expected for surfaces of opposite polarity. However, the instantaneous force switches between attractive and repulsive over an oscillation cycle at certain frequencies. Next, the force is quantified for suddenly applied and pulsed voltages. In the former case, the force approaches its long-time limit exponentially: on a resistor-capacitor or bulk diffusion time scale for an electrolyte with equal or unequal ionic diffusivities, respectively. The long-time decay of the force for a pulsed voltage also decays exponentially on the same timescales. The theory developed here is a dynamic generalization of the equilibrium double layer force, with potential applications to electrochemical devices, force-based spectroscopy, and colloidal directed assembly.

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Section: Comparison To Experimentsmentioning

confidence: 99%

Section: Comparison To Experimentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Dynamic double layer force between charged surfaces

Balu

Khair

2020

Phys. Rev. Research

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“…Considering all of the known mechanisms at the same time is not possible, especially in experimental [15][16][17][18] and analytical 11 studies. Because of that, there are different methods invented and used for EDLS simulations such as Molecular dynamics (MD) [19][20][21][22] , Monte-Carlo 23,24 , lattice model 7 , density functional theory (DFT) 13,25 , mixed DFT with MD and post-HartreeFock calculation 6 , and machine-learning [26][27][28] .…”

mentioning

confidence: 99%

The effects of slit-pore geometry on capacitive properties: a molecular dynamics study

Biagooi

Oskoee

2020

Sci Rep

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Ionic-liquids (IL) inside conductive porous media can be used to make electrical energy storage units. Many parameters such as the shape of the pores and the type of IL affect the storage performance. In this work, a simple IL model inside two geometrically different slit-pores is simulated and their capacitive properties are measured. The pores were of finite length, one of them was linear and the other had a convex extra space in the center. The molecular dynamics simulations are done for two, qualitatively, low and high molarities. The pores have been simulated for both initially filled or empty conditions. Differential capacitance, induced charge density, and IL dynamics are calculated for all of the systems.

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Enabling Superior Sodium Capture for Efficient Water Desalination by a Tubular Polyaniline Decorated with Prussian Blue Nanocrystals

et al. 2020

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The application of electrochemical energy storage materials to capacitive deionization (CDI), a low‐cost and energy‐efficient technology for brackish water desalination, has recently been proven effective in solving problems of traditional CDI electrodes, i.e., low desalination capacity and incompatibility in high salinity water. However, Faradaic electrode materials suffer from slow salt removal rate and short lifetime, which restrict their practical usage. Herein, a simple strategy is demonstrated for a novel tubular‐structured electrode, i.e., polyaniline (PANI)‐tube‐decorated with Prussian blue (PB) nanocrystals (PB/PANI composite). This composite successfully combines characteristics of two traditional Faradaic materials, and achieves high performance for CDI. Benefiting from unique structure and rationally designed composition, the obtained PB/PANI exhibits superior performance with a large desalination capacity (133.3 mg g−1 at 100 mA g−1), and ultrahigh salt‐removal rate (0.49 mg g−1 s−1 at 2 A g−1). The synergistic effect, interfacial enhancement, and desalination mechanism of PB/PANI are also revealed through in situ characterization and theoretical calculations. Particularly, a concept for recovery of the energy applied to CDI process is demonstrated. This work provides a facile strategy for design of PB‐based composites, which motivates the development of advanced materials toward high‐performance CDI applications.

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Charging dynamics of an individual nanopore

Cited by 53 publications

References 50 publications

Dynamic double layer force between charged surfaces

Dynamic double layer force between charged surfaces

The effects of slit-pore geometry on capacitive properties: a molecular dynamics study

Enabling Superior Sodium Capture for Efficient Water Desalination by a Tubular Polyaniline Decorated with Prussian Blue Nanocrystals

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