Abstract. Some kinds of checking methods and principle of dissolved oxygen in water were summarized. Such as: iodometric method, current determination method (Clark dissolved oxygen electrode), conductance measurement and fluorescence quenching. The advantages and disadvantages of each method were compared, and fluorescence quenching was discussed.The method uses Ruthenium complex as fluoresce...

The detection of oxygen (O2) by optical sensors is growing importance, for example, in biology, life science, environmental and aerodynamics, where the composition gases crucial many applications. Purely organic O2 are very attractive monitoring food deterioration, biosensing, biomonitoring, as they can provide continuous, reversible, nondestructive sensing. However, purely reversible that work...

The electrode potential constitutes a dynamical variable whenever an electrode is resistively coupled to the electric circuit. We show that at the nanoscale, the discreteness and stochasticity of an electron transfer event causes fluctuations of the electrode potential that render all elementary electrochemical reactions to be faster on a nanoelectrode than predicted by the macroscopic (Butler-...

In this paper we study, analytically and numerically, the existence and blow up of solutions to two dimensional boundary value problems of the form ∆uλ = 0 in Ω, ∂uλ/∂n = Duλ + λf(uλ) on ∂Ω. We place particular emphasis on f(u) = sinh(u) = e u−e−u 2 , in which case the nonlinear flux boundary condition is frequently associated with the names of Butler and Volmer.

The Poisson-Nernst-Planck equations with generalized Frumkin-Butler-Volmer boundary conditions (PNP-FBV) describe ion transport Faradaic reactions, and have applications in a number of fields. In this article, we develop an adaptive time-stepping scheme for the solution PNP-FBV system based on two methods: fully-implicit (VSBDF2) method, semi-implicit (VSSBDF2) method. We present simulations un...

Conducting polymers (CPs) have contributed significantly to the field of sensing. The sensing nitroaromatic compounds by fluorescence has recently gained more attention due its sensitivity and selectivity. In this study, polyaniline (PANI) was functionalized forming a polyaniline-Ag (PANI-Ag) composite used as fluorophore for nitro groups present in (NACs) such 2,4,6-trinitrophenol (picric acid...

Two different metrics are used to assess Forster resonance energy transfer (FRET) between fluorophores in the steady state: (i) acceptor-quenching of donor fluorescence E (also known as transfer efficiency) and (ii) donor-excited acceptor fluorescence F(A) (Dex). While E is still more widely used, F(A) (Dex) has been gaining in popularity for practical reasons among experimentalists who study b...

Abstract Electrochemical hydrodynamic techniques typically involve electrodes that move relative to the solution. Historically, approaches involving rotating disc electrode (RDE) configurations have become very popular, as one can easily control electroactive species’ mass transport in those cases. The combination of cyclic voltammetry and RDE is nowadays standard characterization protocols ele...

Dual nucleophilic phosphine photoredox catalysis is yet to be developed due facile oxidation of the organocatalyst phosphoranyl radical cation. Herein, we report a reaction design that avoids this event and exploits traditional organocatalysis with allow Giese coupling ynoates. The approach has good generality, while its mechanism supported by cyclic voltametric, Stern–Volmer quenching, interce...