Local amperometric detection of K+ in aqueous solution using scanning electrochemical microscopy ion-transfer voltammetry

Evans, Nicholas; Gonsalves, Marylou; Gray, Nicola J.; Barker, Anna; Macpherson, Julie V.; Unwin, Patrick R.

doi:10.1016/s1388-2481(99)00169-1

Cited by 25 publications

(26 citation statements)

References 23 publications

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“…Micropipettes for the electrochemical measurement were prepared as described previously [9]. The pipette was filled by drawing solution through the tip using a syringe attached at the other end.…”

Section: Microinterface Preparationmentioning

confidence: 99%

Amperometric method for determining the degree of complexation of polyelectrolytes with cationic surfactants

Hakkarainen¹,

Gilbert²,

Kontturi³

et al. 2004

Journal of Colloid and Interface Science

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Section: Microinterface Preparationmentioning

confidence: 99%

Amperometric method for determining the degree of complexation of polyelectrolytes with cationic surfactants

Hakkarainen¹,

Gilbert²,

Kontturi³

et al. 2004

Journal of Colloid and Interface Science

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“…This type of probe also enables the amperometric detection of ions which cannot be determined by conventional electrolysis at solid electrodes, e.g., K + [85,86]. Such probes have been used in SECM [83,122,227,228]. 91 Figure 27 (a) Block schematic of the typical instrumentation for SECM with an amperometric UME tip.…”

Section: Probesmentioning

confidence: 99%

Microelectrochemical Techniques for Probing Kinetics at Liquid/Liquid Interfaces

Guo

Unwin

Whitworth

et al. 2004

Progress in Reaction Kinetics and Mechanism

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We provide an overview of recent advances in microelectrochemical approaches to investigate the kinetics of various physicochemical processes that occur at the interface between two immiscible electrolyte solutions (ITIES). To place the advances in context, background material on the structure of the ITIES, derived from both experimental studies and computer simulation, is also provided. The main focus of the article is micro-ITIES techniques, single droplet measurements, microelectrochemical measurements at expanding droplets (MEMED) and scanning electrochemical microscopy (SECM). Recent developments in a combined SECM-Langmuir trough technique for probing diffusion processes across Langmuir monolayers at the water/air (W/A) interface are also highlighted, by considering an organic monolayer at a water surface as a special case of a liquid/liquid interface.

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“…3 Recently, a nano/micro pipet filled with a solution immiscible with an outer solvent was employed as a probe in SECM measurements. [4][5][6][7] Probing the concentration and/or flux of a non-electroactive ion such as potassium, sodium or calcium is important since these species are employed in various physiological activities.…”

Section: Introductionmentioning

confidence: 99%

“…8 A micropipette filled with a solution of an ionophore, such as valinomycin or one of several crown ether derivatives, dissolved in an organic solvent has been used to probe non-electroactive ions in SECM. [5][6][7] To accurately image the concentration/flux change of these ions at an interface, such as would be found in biological cells, control of the distance between the tip of the probe and the sample is crucial. SICM has proven to be one of the most promising tools for non-contacting tip/sample distance control.…”

Section: Introductionmentioning

confidence: 99%

A Potassium-sensitive Micro/Sub-micro-electrode for Shear Force-based Scanning Electrochemical Microscopy

Haraguchi

Yasunaga

Yamada

2016

Trans. Mat. Res. Soc. Japan

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A micro/sub-micrometer-sized potassium-sensitive electrode was fabricated and used as a probe for shear force-based scanning electrochemical microscopy (SECM) in standing approach mode, and the pores of a membrane filter were imaged as a model of living cells. In general, the electrode was prepared by silanizing the walls of a capillary with octadecyltriethoxysilane (ODS) to prevent penetration of aqueous solution into the capillary, and then filling with a solution of an ionophore. When this electrode approached the surface, the ionophore solution slightly protruded from the tip and contacted the sample surface. Therefore, the hydrophobic layer, at the tip of the capillary only, was removed. Because of this treatment, a very small amount of the aqueous solution penetrated the tip of the capillary when the electrode was immersed in aqueous solution. Using this capillary, SECM and topographic images of a polycarbonate membrane filter having 5 m pores were successfully obtained.

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Local amperometric detection of K+ in aqueous solution using scanning electrochemical microscopy ion-transfer voltammetry

Cited by 25 publications

References 23 publications

Amperometric method for determining the degree of complexation of polyelectrolytes with cationic surfactants

Amperometric method for determining the degree of complexation of polyelectrolytes with cationic surfactants

Microelectrochemical Techniques for Probing Kinetics at Liquid/Liquid Interfaces

A Potassium-sensitive Micro/Sub-micro-electrode for Shear Force-based Scanning Electrochemical Microscopy

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