Single Nanoparticle Detection in Ionic Liquids

Tanner, Eden E. L.; Batchelor‐McAuley, Christopher; Compton, Richard G.

doi:10.1021/acs.jpcc.5b10745

Cited by 13 publications

(12 citation statements)

References 44 publications

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“…1b). These stochastic events are similar to previously reported results of nanoparticles oxidation where discrete events expressed as current spikes are seen during voltammetric [27] and chronoamperometric scans and reflect the electrochemistry of an individual colloid. Thus the spikes likely signal the arrival of new droplet at the interface via diffusion from bulk solution.…”

supporting

confidence: 89%

Electrochemistry of single droplets of inverse (water-in-oil) emulsions

Zhang

Sepunaru

Sokolov

et al. 2017

Phys. Chem. Chem. Phys.

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We demonstrate the feasibility of electrochemically detecting individual water droplets dispersed in an oil phase (inverse emulsions) via the use of a redox probe confined in the droplet phase. The water droplets were tagged with potassium ferrocyanide, and were injected into an electrolyte cyclohexene/dichloromethane oil solution. Via simple cyclic voltammetry scans it is shown that single water droplets from a water-in-oil emulsion can be detected provided that rapid anion transfer from the oil to the water phase maintains electro-neutrality in the droplet.

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supporting

confidence: 89%

Electrochemistry of single droplets of inverse (water-in-oil) emulsions

Zhang

Sepunaru

Sokolov

et al. 2017

Phys. Chem. Chem. Phys.

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“…An aliquot of ionic liquid containing silver nanoparticles was then mixed in, and another chronoamperogram was recorded at 1 V (Figure 7). The chronoamperogram showed a number of spikes in the current, which, when integrated, provided consistent sizing with Dynamic Light Scattering and transmission electron microscopy [27].…”

Section: Resultssupporting

confidence: 57%

“…Electrochemical experiments (chronoamperometry) were conducted using a low noise potentiostat that was built in-house [13] and has been described fully previously [27]. All experiments were conducted inside a temperature controlled Faraday cage [28].…”

Section: Electrochemical Apparatusmentioning

confidence: 99%

Destructive nano-impacts: What information can be extracted from spike shapes?

Kätelhön

Tanner

Batchelor‐McAuley

et al. 2016

Electrochimica Acta

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100

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The fast-advancing method of nano-impacts is a powerful approach for the immediate detection and characterisation of nanoparticles. During the measurement particles stochastically impact on a biased electrode immersed in a colloidal solution, where they may enable an electrochemical reaction. In the case of a destructive impact, particles electrodissolve at the electrode surface, which can be seen as a spike in the electrode current. While these spikes are successfully used to measure particle concentrations and to determine size distributions via the overall charge transferred per spike, the spike shape is however usually not included in the analysis. In this work, we explore in which ways spike shapes can be exploited to gain additional information on the investigated particle system. To this end, the limiting cases of two reaction models are introduced and discussed in the context of the opportunities and limitations imposed by hardware filters. In particular, we demonstrate that Bessel-type filters conserve the overall charge transferred during an impact event, even if the bandwidth of the signal is far beyond the passband of the filter. Our findings are further compared to experimental data obtained from measurements in aqueous solutions and ionic liquids.

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“…Fundamental aspects and potential applications have been reviewed previously [1][2][3][4][5][6]. The technique involves a conventional three-electrode setup for an electrochemical analysis with a working electrode held at a suitable potential to observe an electrochemical reaction at, or of, individual particles that are suspended in an aqueous or other solutions such as ionic liquids [7]. Collisions of the particles with the electrode occur by virtue of their Brownian motion which may result in a charge transfer between the colliding particle and the stationary electrode.…”

Section: Introductionmentioning

confidence: 99%

In situ Detection of Microplastics: Single Microparticle‐electrode Impacts

et al. 2017

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Particle‐impact electrochemistry is employed to study spherical polyethylene microparticles suspended in an aqueous solution. This electrochemical method detects polyethylene microparticles impacting on a carbon fiber electrode generating a transient current response or “spike”. We interpret the physio‐chemical origin of the spikes and accurately identify particle size distributions and concentrations for microparticles of sizes 1–10 μm.

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Single Nanoparticle Detection in Ionic Liquids

Cited by 13 publications

References 44 publications

Electrochemistry of single droplets of inverse (water-in-oil) emulsions

Electrochemistry of single droplets of inverse (water-in-oil) emulsions

Destructive nano-impacts: What information can be extracted from spike shapes?

In situ Detection of Microplastics: Single Microparticle‐electrode Impacts

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