Field electrochemical contact angle measurment method based on micronano interface

Abstract

The on-site electrochemical contact angle measurement method based on the micro-nano interface can be used to detect the contact angle of samples or interfaces under in-situ electrochemical conditions. The method is: through the electrochemical contact angle detection system, the transient change of the contact angle under the control of the applied potential / current is detected online, that is, the glassy carbon or The gold electrode is used as the working electrode and the liquid-solid interface, and the sample droplet to be measured is dropped on it, and the reference electrode and the counter electrode are inserted into the sample droplet to be tested. While measuring the electrochemical signal of the sample at the electrochemical workstation, the contact The angle measuring instrument takes pictures to obtain the signal of the change of contact angle, and uses the contact angle measuring instrument to calculate the shape of the droplet on the photographed pictures, obtain the data, and further fit and analyze, analyze and compare the contact angle displayed in the pictures , to detect the change of the hydrophilicity and hydrophobicity of the sample under different voltage and current conditions, and finally obtain the result.

Description

technical field [0001] The invention relates to a method for measuring on-site spectroelectrochemical contact angle, which belongs to the technical field of chemical measurement. Background technique [0002] Nanomaterials science and engineering has become a worldwide research hotspot. When studying the surface modification of materials, the concept of wetting contact angle is often involved. The so-called contact angle refers to the droplet on the surface of the material, which is formed when the liquid phase is sandwiched between the two tangent lines of the gas-liquid interface and the solid-liquid interface at the solid-liquid-gas three-phase junction point on the surface. corner. It is the angle between the liquid surface tension and the liquid-solid interfacial tension. The size of the contact angle is determined by the relative size of the interfacial tension at the three-phase interface of gas, liquid and solid. From the value of the contact angle, it can be seen ...

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Problems solved by technology

[0003] The previous research on contact angle can only statically analyze the hydrophilic and hydrophobic properties of droplets, but under the influence of other physical factors such as light, electricity, magnetism and other physical quantities, the instrument can only measure the change of contact angle, and cannot analyze these physical quantities. The change of the test sample can be dynamically recorded, so it is impossible to quantitatively analyze the change of the sample to be tested with the external conditions.

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