Investigation Of Facilitated Ions Transfer At The Liquid/Liquid Interface With Scanning Electrochemical Microscopy And Micro-droplet

Ion transfer has been the common process such as in the phase transfer catalysis, extraction process, electrodialysis, and bioscience an so on. The pioneering work by Gavach and Koryta made the charge transfer at the interface between two immiscible electrolyte solutions (ITIES) to the extensive research. At the same time , they opend up a new field for electrochemistry. The electrochemical process of Liquid/Liquid interface(L/L interface) have been study for charge transfer (electron transfer, ET and ion transfer, IT) at the interface between two immiscible electrolyte solutions and the chemical reactions followed with the charge transfer process. The charge transfer at the interface between two immiscible electrolyte solutions was one of the most basic process in physical chemistry, moreover the liquid/liquid (L/L) interface has been considered as the simplest model for biological membranes, and had the Significant Relationship with chemistry and Biomedical system. Therefore, the research of ion transfer on biomembrane is meaning for us to realize and understand many important physiological processes, and to open the secret of substance and energy metabolism in biological systems.With the accelerated development of scientific technology and the mutual infiltration among various disciplines, investigation of interfacial electrochemistry may encounter more and more chance and challenge. However, recent precise technologies and more reasonable methods will be destined to exploit the broad foreground of nature. The thesis applied scanning electrochemical microscopy (SECM) which was developed by Bard and co-workers in 1989 and micro-drop method and the micro-tube technology which was developed by Girault to investigate the ion transfer across interface. There are four parts in this paper, and the main contents are as follows:1. A short review was given on the progress of the liquid/liquid interface electrochemistry, introduced the liquid/liquid interface model and research method. Meanwhile, the fundamental theory and the application in the interface chemistry of facilitated ion transfer was elaborated clearly.2. We have developed the L/L-AAO interface. More important is that, in virtue of the interface, not only the lifelikeness of ion channels can be recurred easily, but also both the process and the energy of ion through the ion channels are obtained commendably simultaneously. Furthermore, the experimental results show the relationship between rate constant and the driving force. The constant of the ion controlled how the ion channels open or closed. The driving force is an important factor of how fast the ion through the ion channels.3. IT processes of Li⁺ and Na⁺ were studied by SECM and micro-drop method across the simulative membrane, and calculated theâ–³_o^wΦ_i^o(V) andâ–³_o^wG_tr,i^o,w→o, studied the force of interface. The different substitutes of crown ether has been sutdied at the L/L interface, and compared the different substitutes with effect about the ion transfer. The experiment results showed that the crown ether and the porphyrin made the conjugation effect which made for ion teansfer reaction.4. The Ni⁺ and Co⁺ facilitated by TCNQ has been studied by SECM and micro-drop method. Then sutdied the complexation reaction at the L/L intreface. Results demonstrated that the ion transfer reaction controlled by the diffuse of TCNQ, The reaction mechanism was happened a complexation reaction for 2:1 interface transfer process. We infered that Co²⁺ or Ni²⁺ in two sides of resultant which is a symmetrical structure.