Direct Analyses of an Electrochemically Induced Dye Formation Reaction across a Single-Microdroplet/Water Interface

Nakatani, Kiyoharu; Suto, Toshihide; Wakabayashi, Mari; Kim, Haeng‐Boo; Kitamura, Noboru

doi:10.1021/j100013a051

Cited by 28 publications

(38 citation statements)

References 5 publications

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“…The lowest solid experimental curve was obtained in the absence of TCNQ in the DCE phase and the corresponding dashed curve is the theory for negative feedback [194]. www.scilet.com 130 oxidation process. In contrast, the ET rate increased with driving force when this was adjusted via the redox potential of the aqueous oxidant.…”

Section: Oxidation Of Organic-phase Decamethylferrocene By Aqueous Oxmentioning

confidence: 94%

“…LASER-TRAPPED DROPS Electrochemical measurements have been performed at microdroplets trapped by a laser beam to facilitate positioning on [124][125][126][127][128] or adjacent to [129][130][131][132][133] an UME. Compared to stirred tank techniques [3] which only allow g) Si-Xuan Guo, Patrick R. Unwin, Anna L. Whitworth and Jie Zhang www.scilet.com 60 measurements of the average behaviour of droplets dispersed in a solution, the ability to focus on a single droplet, opens up the possibility of investigating sizedependence effects on the kinetics of chemical processes [134].…”

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confidence: 99%

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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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Section: Oxidation Of Organic-phase Decamethylferrocene By Aqueous Oxmentioning

confidence: 94%

mentioning

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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“…25,26,32 Other important effects are from the accelerated electron transfer and molecular configuration of chemicals at the interface with asymmetric environment on each side. 22,33 The interfacial molecules are activated from solvation with lower energy barrier for the reaction and faster kinetics. 34,35 Though multiple possible mechanisms were proposed to interpret the accelerated kinetics, however, the quantitative analysis based on tracing in-situ droplet reaction is still missing.…”

Section: Introductionmentioning

confidence: 99%

Size Effect on Reaction Rate of Surface Nanodroplets

Li¹,

Kiyama²,

Zhang³

et al. 2021

Preprint

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Compartmentalizing reagents within small droplets is promising for highly efficient conversion and simplified procedures in many biphasic chemical reactions. In this work, surface nanodroplets (i.e., less than 100 nm in their maximal height) were employed to quantitatively understand the size effect on the chemical reaction rate of droplets.In our systems, a surface-active reactant in pure or binary nanodroplets reacted with the reactant in the bulk flow. Meanwhile, the product was removed from the droplet surface. The shrinkage rate of the nanodroplets was characterized by analyzing the lateral size as a function of time, where the droplet size was solely determined by chemical reaction rate at a given flow condition for the transport of the reactant and the product. We found that the overall kinetics increases rapidly with the decrease of droplets lateral radius R, as dR/dt ∼ R −2 . The faster increase in the concentration of the product in smaller droplets contributes to accelerating reaction kinetics. The enhancement of reaction rates from small droplet sizes was further confirmed when a

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“…Nakatani and coworkers found that electron transfer was accelerated at droplet surface. [26][27][28] Furthermore, Fallah-Araghi et al 22 demonstrated that the reaction rate is inversely proportional to the droplet radius, related to the preference of product adsorption and desorption at the droplet interface that accelerates the rate and shifts the balance of the chemical reaction. 22 The active energy barrier was found to be negligible for the reactions within droplets, possibly due to the molecular configuration of reactants at the droplet surface.…”

mentioning

confidence: 99%