Research On The Solid-Liquid Interface Based On Confocal Scanning Principle

With the rapid development of micro-nano mechanical and electronic manufacturing technology,the size of micro-nano devices is constantly decreasing.In the field of micro-nano fluid devices,their scale effects have become an urgent problem to be solved.Under microscopic conditions,the presence of fluid resistance at the solid-liquid interface in the microchannel affects the transport efficiency of the liquid,thus becoming a bottleneck restricting its development.It depends on the development of interface science,especially the interpretation of the mechanism of action of the microscopic characteristics of the solid-liquid interface on surface wettability.Under macroscopic conditions,the study of the state mechanism of the solid-liquid interface can become a feasible solution for the problem that the performance improvement of surface wettability is limited in applications such as aerospace,biological materials,and construction pipes.Due to the difficulty of detecting the solid-liquid interface,only two-dimensional structures can be obtained by using traditional X-ray detection methods.In this paper,the spectral confocal chromatography scanning technology is introduced into the exploration of solidliquid interface morphology,and the three-dimensional geometric parameters of the solid-liquid interface are obtained,and the high-precision solid-liquid interface profile is constructed on this basis.The specific research work of the paper is as follows:(1)The wettability model of the three-phase contact state of the solid-liquid interface is proposed,the influence of microstructure profile parameters on the stability of the three-phase contact state is discussed,and different types of superhomonic microstructures are designed.At the same time,a superhydrophobic sample was prepared by combining lithography etching and jet coating.(2)A three-dimensional geometric parameter measurement device for the threephase contact state is constructed by using a spectral confocal sensor and a highprecision two-dimensional displacement platform.Aiming at the problem of difficult identification of liquid-gas interface,a solution for liquid staining is proposed.Writing control software,using continuous scanning,software-triggered scanning scheme,a scanning method of solid-liquid interface is designed,so as to obtain the three-dimensional geometric parameters of the three-phase contact state,so as to achieve the purpose of intuitively studying the three-phase contact state of solidliquid-gas at the microscopic scale.At the same time,the scanning device is verified through experiments to meet the accuracy requirements of the scanning.(3)After scanning the 3-D contour dataset of three-phase contact state,aiming at the noise and data holes generated during the measurement process,the parameter adaptive bilateral filter method is used to filter the data,which solves the influence of the error on the fitting accuracy.The moving least squares fitting algorithm is used to smooth the image,and the 3-D morphology of the solid-liquid interface in threephase contact state is reconstructed.The experimental results show that the typical shape of the three-phase contact state unit is generated on the sample surface,and the three-phase contact state three-dimensional geometry parameter measuring device can obtain the three-dimensional contour of the solid-liquid interface.The research results of this paper can improve the theoretical model of solid-gas interface and liquid-gas interface state on Super-sparse liquid surface,which can make the description of solid-liquid-gas three-phase contact state and evolution rule more accurate.It is helpful to study the influencing factors and mechanism of the size of the three-phase contact state of solid-liquid interface,so as to further study the theory of surface wetting performance,promote the cross-fusion and wide application of Super-sparse liquid surface in many fields such as modern mechanical science,which has important theoretical significance and engineering application value.