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    Home > New progress in the measurement of molecular adsorption free energy at solid-liquid interface by Hong Wenjing / Yang Yang team of Xiamen University

    New progress in the measurement of molecular adsorption free energy at solid-liquid interface by Hong Wenjing / Yang Yang team of Xiamen University

    • Last Update: 2019-09-17
    • Source: Internet
    • Author: User
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    Recently, the research group of Professor Hong Wenjing, School of chemistry and chemical engineering, Xiamen University, has developed a new method to measure the adsorption energy of molecules by using the single molecule electrical measuring instrument independently developed Relevant research results were published in the Journal of German Applied Chemistry (DOI: 10.1002 / anie 201907966) under the title of "single molecular measurement of absorption free energy at the solid liquid interface" Adsorption behavior plays an important role in the chemical and biological processes of solid-gas and solid-liquid interface For example, in the heterogeneous catalysis process, the adsorption of molecules is often the first step or even the decisive step Adsorption energy is an important parameter in the description of adsorption process Its measurement results have important guiding significance for the development of high-efficiency catalyst, the design of sensor and the characterization of material properties The measurement of the adsorption heat of molecules at the solid-liquid interface at the single molecular scale can not only eliminate the influence of neighboring molecules on the adsorption process of target molecules, so that the adsorption process of molecules can be understood at a deeper level, but also conform to the adsorption behavior of molecules to design and develop more effective molecular structure construction However, due to the limitation of the small size of the target molecule and the weak electrical signal of the target molecule, there is no method to measure the adsorption heat of the molecule at the solid-liquid interface at the single molecular scale The research team has developed a statistical data analysis method for single molecule events Using this method, researchers can get the formation probability of molecular knots in the experimental system (NAT Commun 2017.8.15436) The researchers measured the coalescence probability of three model molecules under a series of gradient concentrations through the idea of "single molecule counting", and found that the trend of the coalescence probability under different concentrations follows the classical model in adsorption Langmuir model; according to Langmuir adsorption model, the adsorption energy of three molecules at the solid-liquid interface is calculated; the experimental value of the adsorption energy is compared with the theoretical value, which has a high consistency The research work was completed under the guidance of Professor Hong Wenjing of Xiamen University and associate professor Yang Yang of sabendong micro nano Research Institute Dr Zhan Chao, Center for collaborative innovation of energy materials chemistry, and Wang Gan, master student of sabendong micro nano Research Institute, are the co first authors of the paper Dr Zhang Xiaguang has completed the work of theoretical calculation, and the doctoral student Li Zhihao and the master student Wei Junying have also participated in part of the work Professor Tian Zhongqun participated in the discussion of the research work and gave important guidance This work is supported by NSFC, national key R & D program, President's fund of Xiamen University, National Key Laboratory of solid surface physics and chemistry, collaborative innovation center of energy materials chemistry and other platforms.
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