Measuring analyzer for dynamic characteristics of liquid surface and interface based on high speed image processing

Abstract

The related liquid surface and interface dynamic behavior test and analysis device based on high-speed image process comprises: with a general platform, arranging an optical system, a video imaging system, a control system for locating and feeding, a rotating platform, a LED monochromatic cold light source, and a computer-control light modulation system. This invention has well effect and reliability.

Description

technical field [0001] The invention relates to the fields of scientific analysis instruments and detection instruments, in particular to a liquid surface interface dynamic characteristic measurement analyzer based on high-speed image processing. Background technique [0002] In the field of surface and interface science, it is very important to measure liquid / fluid surface interfacial tension, free energy, contact angle, and analyze properties such as wettability, viscosity, and adsorption process, which can be widely used in scientific research, professional research and development, and manufacturing, Different fields such as surface treatment and quality control: For example, nanomaterial science and engineering have become a worldwide research hotspot. When studying the surface modification of nanomaterials, the concept of wetting contact angle is often involved. [0003] At present, the most common experimental methods for measuring properties such as surface tension c...

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Problems solved by technology

[0004] ①. Balance method: Calculate the surface interfacial tension by measuring the force acting on a certain solid surface (thin plate, ring, cylinder and other geometric shapes). The advantage of this method is that it does not need to measure the density of the liquid separately. The disadvantage is that all The amount of liquid required is large (more than tens of milliliters), and the stability and accuracy of the data will be poor; the solid surface must be cleaned before each measurement, and the instrument needs to be calibrated frequently. It must be ensured that the measured liquid can completely wet the solid surface (that is, the contact angle is 0), due to the high precision of the balance used, it often takes a long time to stabilize; it is difficult to achieve measurement under high temperature and high pressure, and is not suitable for some high-viscosity liquids (such as high molecular weight and high viscosity) binder and polymer melt)

[0005] ②. Pressure measurement method: These methods include capillary height method, maximum bubble pressure method, etc. The former is generally limited to teaching and demonstration at present, and the latter is often used to measure the dynamic surface tension of low-viscosity liquids (such as aqueous solutions). The advantages of both are also The density value of the liquid to be tested is not required. The disadvantage of the latter is that it is only suitable for very low viscosity liquids, and the amount of liquid required is also large. The stability and accuracy of the data are poor, so it is generally only used for low viscosity liquids. Measurement of the dynamic surface tension of liquids

[0007] At present, domestic surface tensiometers are mostly based on the above-mentioned methods ① and ②. The defects of these methods have been stated before, mainly because the data stability and accuracy are relatively poor, and they are not suitable for some high-viscosity liquids and some The measurement and analysis of specific requirements (such as high temperature and high pressure) conditions also have obvious defects in the degree of automation of measurement and the convenience of operation; there are very few units in the third category of development based on computer image processing technology in China, and the current products in this area are due to There are not many developments, and the development history is not long. Compared with similar foreign products, there are still obvious gaps in many aspects, mainly reflected in the three levels of measurement technology, computer image analysis software, and instrument hardware, which leads to the convenience of instrument measurement and analysis. Reliable, Versatile Has Flaws:

[0009] (2) The hardware design of the instrument is relatively fixed, not based on modular design, and cannot be flexibly combined and configured according to the measurement requirements of different users, which wastes the inherent functions and resources of the instrument

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