Investigation Of Facilitated Ions Transfer At The Liquid/Liquid Interface With Single Particle Electrochemistry Of Collision

Interface between two immiscible electrolyte solutions(ITIES),also known as the liquid/liquid interface(L/L interface).The ion transfer across ITIES is one of the most elementary physical chemistry processes,which involves important fields such as interface catalysis,ion transport across membranes,extraction,and drug release,and shows great value in fundamental research and practical applications.Recently,various methods were applied to the study of the ion trans-fer reaction at the liquid/liquid interface,including the four-electrode system,scanning electro-chemical microscope,spectroelectrochemistry,and microdroplet electrochemistry.However,some restrictions exist in these methods,such as difficulty in operation or the need for special instruments to assist,which impeded its application in other fields.In recent years,rapid progress in the field of single particle electrochemistry of collision has opened a novel exploratory area in the field of analytical and electrochemistry.Single particle electrochemistry of collision is a method of studying the behavior of particles at the single particle level,which yields important information on the diffusion coefficient,individual parti-cle size,size distribution,catalytic activity,collision frequency,and internal substances of the particles.The single particle electrochemistry of collision has been applied to a wide range of hard nanoparticles(metal,metal oxide,and polymers NPs)and soft particles(cells,proteins,viruses,liposomes,enzymes,vesicles,emulsion droplets,micelles,carbonaceous nanomateri-als,and others).At present,the investigation of facilitated ions transfer at the liquid/liquid in-terface with single particle electrochemistry of collision has been rarely reported.In this thesis,facilitated ions transfer at the liquid/liquid interface was investigated with single particle elec-trochemistry of collision.This work was supported by the funding of the National Science Foundation of China“Study on detection of soft particle collision by electrochemiluminescence analysis”(No.21675124,2017.01-2020.12).The full text is divided into four chapters,the main contents are summarized as follows:In Chapter 1,an overview was given on the electrochemical study of the liquid/liquid interface.Firstly,the basic structure and model of liquid/liquid interface,the development history and the classification of the charge reaction at the liquid/liquid interface were introduced.The principle and research progress of facilitated ion transfer reaction at the liquid/liquid interface were de-scribed.Secondly,the basic principle,development process and classification of the single par-ticle collision electrochemical detection method were presented.At last,the main content and significance of this study was concluded.In Chapter 2,the single particle collision electrochemistry was employed to investigate the fa-cilitated Na~+transfer reaction with three common organic solvents as ionophores at the wa-ter/nitrobenzene interface.Based on the electrochemical collision behavior of the water-in-oil emulsion particles on an ultramicroelectrode,the ability of three common organic solvents as ionophores to facilitate Na~+transfer at the water/nitrobenzene interface was analyzed.In Chapter 3,the K~+facilitated transfer reaction at the liquid/liquid interface composed of two different ionic liquids was investigated with single particle electrochemistry of collision.Based on the electrochemical behavior of water-in-oil emulsion particles colliding on ultramicroelec-trode,the effects of ionic liquid viscosity on the facilitated transfer reaction of K~+at the liquid/liquid interface were analyzed.In Chapter 4,the main conclusions of the work were summarized,and the further work direction was proposed.