Iontronics: Aqueous ion-based engineering for bioinspired functionalities and applications

Han, Soo-Boo; Oh, Min-Ah; Chung, Taek Dong

doi:10.1063/5.0089822

Cited by 16 publications

(19 citation statements)

References 159 publications

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“…Ionic transport near solid–liquid interfaces can differ drastically from that in bulk due to Coulombic interactions with the surface . Such interface effects can be used to tailor nanofluidic devices, finding applications in desalination, , ionic circuitry, , biochemical sensing, − energy harvesting, , and neuromorphic signaling. − A particularly useful element for directional control of ionic currents is a current rectifier, ,− also known as a diode. In fact, the phenomenon of ion current rectification (ICR) has been observed and extensively studied in nanochannels. − …”

Section: Introductionmentioning

confidence: 99%

Ion Current Rectification and Long-Range Interference in Conical Silicon Micropores

Aarts

Boon

Cuénod

et al. 2022

ACS Appl. Mater. Interfaces

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Fluidic devices exhibiting ion current rectification (ICR), or ionic diodes, are of broad interest for applications including desalination, energy harvesting, and sensing, among others. For such applications a large conductance is desirable, which can be achieved by simultaneously using thin membranes and wide pores. In this paper we demonstrate ICR in micrometer sized conical channels in a thin silicon membrane with pore diameters comparable to the membrane thickness but both much larger than the electrolyte screening length. We show that for these pores the entrance resistance is key not only to Ohmic conductance around 0 V but also for understanding ICR, both of which we measure experimentally and capture within a single analytic theoretical framework. The only fit parameter in this theory is the membrane surface potential, for which we find that it is voltage dependent and its value is excessively large compared to the literature. From this we infer that surface charge outside the pore strongly contributes to the observed Ohmic conductance and rectification by a different extent. We experimentally verify this hypothesis in a small array of pores and find that ICR vanishes due to pore−pore interactions mediated through the membrane surface, while Ohmic conductance around 0 V remains unaffected. We find that the pore−pore interaction for ICR is set by a long-ranged decay of the concentration which explains the surprising finding that the ICR vanishes for even a sparsely populated array with a pore−pore spacing as large as 7 μm.

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Section: Introductionmentioning

confidence: 99%

Ion Current Rectification and Long-Range Interference in Conical Silicon Micropores

Aarts

Boon

Cuénod

et al. 2022

ACS Appl. Mater. Interfaces

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“…Transport phenomena of charged species through channels in the nanometre and micrometre regime play a key role in a plethora of applications, such as desalination [1][2][3], energy conversion [4][5][6], sensing of (bio)molecules [7][8][9][10] and many more [11]. An exciting emerging direction of research is that of iontronics, the use of ion transport for signalling, offering the promise of integration with biological systems due to the ionic nature of many biological processes [12,13]. In particular conical channels have garnered significant interest for such applications [14][15][16][17][18], as they exhibit current rectification thereby acting as ionic diodes [9,14,[19][20][21].…”

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confidence: 99%

Iontronic neuromorphic signalling with conical microfluidic memristors

Kamsma¹,

Boon²,

Rele³

et al. 2023

Preprint

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Experiments have shown that the conductance of conical channels, filled with an aqueous electrolyte, can strongly depend on the history of the applied voltage. These channels hence have a memory and are promising elements in brain-inspired (iontronic) circuits. We show here that the memory of such channels stems from transient concentration polarization over the ionic diffusion time. We derive an analytic approximation for these dynamics which shows good agreement with full finite-element calculations. Using our analytic approximation, we propose an experimentally realisable Hodgkin-Huxley iontronic circuit where micrometer cones take on the role of sodium and potassium channels. Our proposed circuit exhibits key features of neuronal communication such as all-or-none action potentials upon a pulse stimulus and a spike train upon a sustained stimulus.

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“…A promising class of iontronic devices is the organic electronic ion pump (OEIP), an ionic chemical delivery system that uses ion-exchange membranes (IEMs). 129,130 The working principle of the OEIP is electrophoretic ion transport driven by an electric eld applied across a pair of electrodes that are situated in the source and target reservoirs, respectively. An IEM separates the source reservoir, which contains charged chemical species for delivery, and the target reservoir, where cells are located.…”

Section: Chemical Stimulation Of Neural Systems Via Iontronic Devicesmentioning

confidence: 99%

Streamlining the interface between electronics and neural systems for bidirectional electrochemical communication

2023

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Iontronics: Aqueous ion-based engineering for bioinspired functionalities and applications

Cited by 16 publications

References 159 publications

Ion Current Rectification and Long-Range Interference in Conical Silicon Micropores

Ion Current Rectification and Long-Range Interference in Conical Silicon Micropores

Iontronic neuromorphic signalling with conical microfluidic memristors

Streamlining the interface between electronics and neural systems for bidirectional electrochemical communication

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