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

Autores: 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
Afiliações:
1. IAI RAS
Edição: Nº 5 (2023)
Páginas: 65-72
Seção: Articles
URL: https://bakhtiniada.ru/1028-0960/article/view/137756
DOI: https://doi.org/10.31857/S1028096023050102
EDN: https://elibrary.ru/KVIJJZ
ID: 137756

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Resumo

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.

Palavras-chave

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

Bibliografia

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