The influence of energetic surface heterogeneity on proton desorption during capillary filling of silica nanochannels

We developed a theoretical model which describes the influence of the applied potential to the wall of an oxide nanochannel on the diffuse layer potential in the solution filling the nanopore. It was assumed that the surface of oxide is energetically heterogeneous and electrolyte ions from the solution can adsorb on channel walls. We performed calculations for two oxides: SiO 2 and Al 2 O 3 . It was found that energetically heterogeneous oxide surfaces strongly suppress gating potential. Moreover, taking into account ion adsorption considerably increased the electrokinetic potential and reduced the influence of applied potential on the electric double layer in the solution. The density of surface sites is the key parameter in the modeling of oxide nanochannels. Low density of surface hydroxyl groups significantly increases susceptibility on electrofluidic gating.

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“…The factors f i depend on pH and electrolyte ion activities a C and a A , and can be expressed in the following way (Piasecki and Charmas 2013):…”

Section: Theorymentioning

confidence: 99%

The influence of surface energetic heterogeneity on electrofluidic gating of a metal oxide surfaces

Piasecki

Charmas

2016

Adsorption

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Exploring new scaling regimes for streaming potential and electroviscous effects in a nanocapillary with overlapping Electric Double Layers

Das

Guha

Mitra

2013

Analytica Chimica Acta

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Biphasic concentration patterns in ionic transport under nanoconfinement revealed in steady-state and time-dependent properties

Queralt-Martín

Perez-Grau

Alvero-González

et al. 2023

The Journal of Chemical Physics

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Ion permeation across nanoscopic structures differs considerably from microfluidics because of strong steric constraints, transformed solvent properties and charge-regulation effects revealed mostly in diluted solutions. However, little is known about nanofluidics in moderately concentrated solutions, which are critically important for industrial applications and living systems. Here we show that nanoconfinement triggers general biphasic concentration patterns in a myriad of ion transport properties using two contrasting systems: a biological ion channel and a much larger synthetic nanopore. Our findings show a low concentration regime ruled by classical Debye screening and another one where ion-ion correlations and enhanced ion-surface interactions contribute differently to each electrophysiological property. Thus, different quantities (e.g., conductance vs noise) measured under the same conditions may appear contradictory because they belong to different concentration regimes. In addition, non-linear effects that are barely visible in bulk conductivity only in extremely concentrated solutions become apparent in nanochannels around physiological conditions.

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The influence of energetic surface heterogeneity on proton desorption during capillary filling of silica nanochannels

Cited by 3 publications

References 13 publications

The influence of surface energetic heterogeneity on electrofluidic gating of a metal oxide surfaces

The influence of surface energetic heterogeneity on electrofluidic gating of a metal oxide surfaces

Exploring new scaling regimes for streaming potential and electroviscous effects in a nanocapillary with overlapping Electric Double Layers

Biphasic concentration patterns in ionic transport under nanoconfinement revealed in steady-state and time-dependent properties

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