Behavior Features of the Approach Curve of a Scanning Ion-Conductance Microscope

S. Yu. Lukashenko; Лукашенко С. Ю.; O. M. Gorbenko; Горбенко О. М.; M. V. Zhukov; Жуков М. В.; S. V. Pichahchi; Пичахчи С. В.; I. D. Sapozhnikov; Сапожников И. Д.; M. L. Felshtyn; Фельштын М. Л.; A. O. Golubok; Голубок А. О.

doi:10.31857/S1028096023050102

Behavior Features of the Approach Curve of a Scanning Ion-Conductance Microscope

Authors: Lukashenko S.Y.¹, Gorbenko O.M.¹, Zhukov M.V.¹, Pichahchi S.V.¹, Sapozhnikov I.D.¹, Felshtyn M.L.¹, Golubok A.O.¹
Affiliations:
1. IAI RAS
Issue: No 5 (2023)
Pages: 65-72
Section: Articles
URL: https://rjdentistry.com/1028-0960/article/view/664567
DOI: https://doi.org/10.31857/S1028096023050102
EDN: https://elibrary.ru/KVIJJZ
ID: 664567

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Abstract
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Abstract

The operation of a scanning ion-conductance microscope is based on the assumption that the ion current I(z) flowing in an electrolyte solution through the narrow aperture of a probe in the form of a glass nanopipette has a maximum saturation value away from the sample under study and decreases as the probe approaches the surface. The value of the scanning ion-conductance microscope operating current is usually chosen near the saturation current I ~ 09I_sat. However, in some cases there is an unusual behavior of the I(z) approach curve near the surface when the ion current increases as the nanopipette approaches the sample surface. The appearance of a peak on the I(z) curve as the nanopipette approaches the sample surface is what we call the “peak effect”. It is obvious that the peak effect can lead to a failure in the operation of the scanning ion-conductance microscope servo system and noise at the images getting by scanning ion-conductance microscope. In this work the appearance of a peak on the approach curve have been studied experimentally. Considering the nanopipette near the sample surface as a microfluidic system in the form of a T – shaped channel the I(z) dependence using the finite element method and the СOMSOL software package have been calculated.

Keywords

scanning ion conductance microscopy, nanopipette, surface charge, polymers, approach curve, microfluidic system.

References

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