Field electrochemical contact angle investigating method based on micronano interface

Abstract

The invention is a micro-nano interface-based field electrochemical contact angle measuring method, able to be applied to sample or interface contact angle detection on field electrochemical condition. And the method: using electrochemical contact angle detecting system to on-line detect instantaneous contact angle change condition under the control of external potential / current, i.e. using the glass-carbon or gold electrodes of an electrochemical workstation with a working electrode, reference electrode and counter electrode three-electrode system as working electrodes and liquid-solid interface, dropping the sample liquid drops on the working electrode, inserting the reference electrode and counter electrode into the sample liquid drops, measuring electrochemical signals of the sample in the electrochemical workstation and simultaneously using contact angle measurer to shoot pictures and obtaining contact angle variation signals and using he contact angle measurer to calculate shapes of the liquid drops on the shot pictures and obtaining data, further fitting and analyzing, and making analysis and comparison on the contact angles shown by the pictures to detect variation of hydro-phobicity and hydro-philicity of the sample at different voltages and currents and obtaining the final 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 ...

AI Technical Summary

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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