Temperature Sensitivity of Nanochannel Electrical Conductance

Taghipoor, Mojtaba; Bertsch, Arnaud; Renaud, Philippe

doi:10.1021/acsnano.5b01196

Cited by 35 publications

(37 citation statements)

References 32 publications

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“…All of these changes can affect the conductance of the nanofluidic channels/pores. 11 As the temperature increases, the surface charge density of the silica mesopores increases, [12][13][14][15] and thus the concentration of the counter-ions in the electrical double layer (EDL) increases. In addition, as the temperature increases, the liquid viscosity decreases and the ion diffusivity increases, 16 and thus the ion mobility increases ( Fig.…”

Section: Introductionmentioning

confidence: 99%

Thermal dependence of nanofluidic energy conversion by reverse electrodialysis

et al. 2017

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The thermal dependence of salinity-gradient-driven energy conversion by reverse electrodialysis using a mesoporous silica thin film with pores ca. 2-3 nm in diameter was studied in a temperature range of 293-333 K. As the temperature increases, the surface charge density of mesopores increases owing to an increase in the zeta potential of the pore walls, which in turn increases the concentration of counter-ions in the electrical double layer. The ion mobility also increases with increasing temperature owing to a decrease in the liquid viscosity. As a result, the temperature increase improves the ion conductance of mesopores both in the surface-charge-governed regime at low ion concentrations and in the bulk regime at high ion concentrations. However, further increases in temperature induce bubble nucleation. In particular, in highly concentrated salt solutions, hydrophobic patches appear on the pore surfaces because of the salting-out effect and mask the surface charge. The weakened polarity in mesopores allows more co-ions to enter them, decreasing the potential difference across the film, resulting in a serious deterioration of the energy conversion efficiency. The thermal dependence of the performance characteristics of mesoporous-silica-based nanofluidic devices was also evaluated.

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Section: Introductionmentioning

confidence: 99%

Thermal dependence of nanofluidic energy conversion by reverse electrodialysis

et al. 2017

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“…[24][25][26][27][28][29][30][31][32][33][34] However, the effect of temperature of ion transport in nanoscale domains has not been investigated in detail with the exception of the recent work published by Taghipoor and co-workers. 35 These researchers examined the temperature dependence of ion transport through uniform (35 nm height) nanochannels.…”

Section: Introductionmentioning

confidence: 99%

“…at 25 °C) 35. An equation for the dependence of the surface charge on temperature was extracted from values reported in this work to study the effect of temperature on E A .…”

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confidence: 99%

Effect of the Electric Double Layer on the Activation Energy of Ion Transport in Conical Nanopores

et al. 2015

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Measured apparent activation energies, E A , of ion transport (K + and Cl -) in conical glass nanopores are reported as a function of applied voltage (-0.5 to 0.5 V), pore size (20 -2000 nm) and electrolyte concentration (0.1 -50 mM). E A values for transport within an electrically charged conical glass nanopore differ from the bulk values due to the voltage and temperature-dependent distribution of the ions within the double layer. Remarkably, nanopores that display ion current rectification also display a large increase in E A under accumulation mode conditions (at applied negative voltages versus an external ground) and a large decrease in E A under depletion mode conditions (at positive voltages). Finite element simulations based on the Poisson-Nernst-Planck model semi-quantitatively predict the measured temperature-dependent conductivity and dependence of E A on applied voltage. The results highlight the relationships between the distribution of ions with the nanopore, ionic current, and E A , and their dependencies on pore size, temperature, ion concentration, and applied voltage.

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“…The electrochemical properties of the EDL can be manipulated by means of several parameters, such as ion concentration, solution pH, metaloxide surface site density, chemical equilibrium constants [9,10], and solution temperature [11][12][13], where the former parameters have been extensively studied through large body of literature [1,[14][15][16]. Quite surprisingly, temperature effects on structure of EDL at the vicinity of a chemically active solid surface have drawn less attention or ignored to expedite the analysis while it emerges as a determinative factor in many microand nanofluidics applications [17][18][19][20][21][22][23][24][25][26][27]. Several experimental works have shown that the zeta potential of solid-aqeuous interface is not only a function of bulk ion concentration and solution pH but also solution temperature [13,26,[28][29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

Temperature effects on electrical double layer at solid‐aqueous solution interface

Alizadeh

Wang

2020

Electrophoresis

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Despite the significant influence of solution temperature on the structure of electrical double layer, the lack of theoretical model intercepts us to explain and predict the interesting experimental observations. In this work, we study the structure of electrical double layer as a function of thermochemical properties of the solution by proposing a phenomenological temperature dependent surface complexation model. We found that by introducing a buffer layer between the diffuse layer and stern layer, one can explain the sensitivity of zeta potential to temperature for different bulk ion concentrations. Calculation of the electrical conductance as function of thermochemical properties of solution reveals the electrical conductance not only is a function of bulk ion concentration and channel height but also the solution temperature. The present work model can provide deep understanding of micro‐ and nanofluidic devices functionality at different temperatures.

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Temperature Sensitivity of Nanochannel Electrical Conductance

Cited by 35 publications

References 32 publications

Thermal dependence of nanofluidic energy conversion by reverse electrodialysis

Thermal dependence of nanofluidic energy conversion by reverse electrodialysis

Effect of the Electric Double Layer on the Activation Energy of Ion Transport in Conical Nanopores

Temperature effects on electrical double layer at solid‐aqueous solution interface

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