Device for measuring droplet contact angle and rolling angle under temperature control, humidity control and pressure control condition

Abstract

The invention belongs to the technical field of chemical measurement and in particular relates to a device for measuring a droplet contact angle and a rolling angle under a temperature control, humidity control and pressure control condition. A temperature control system is used for accurately controlling the temperature in a specimen box within a range from -20 DEG C to +200 DEG C; a humidity control system is used for controlling the relative humidity range at 0-100%; a vacuum / pressure control system comprises a high pressure system and a vacuum system; the pressure control range is from 10-6 Pa to 8.5 MPa; an anti-fogging device is used for preventing the surface of a glass window from fogging; a high speed image pickup system is used for obtaining a testing droplet contour image; the image sampling speed can reach 1400 thousand frames per second; the highest resolution reaches 1280x800; image sampling data is transmitted to a computer system by a data wire; and the image is fitted by using software according to a Young-Laplace equation so as to the contact angle, rolling angle, advancing angle, backing angle and viscoelastic property of the droplet. The device provided by the invention has the advantages of high automatic degree, testing accuracy, good experiment result repeatability, suitability for a wide temperature range, broad humidity, high pressure and negative pressure system to measure the contact angle, rolling angle, advancing angle, backing angle and lag angle of the droplet.

Description

technical field [0001] The invention relates to a device for measuring droplet contact angle and rolling angle under the conditions of wide temperature range, wide humidity, high pressure and negative pressure, belonging to the technical field of chemical measurement. technical background [0002] Super-hydrophobic phenomena are widespread in nature. For example, the surface of lotus leaves has strong hydrophobicity and self-cleaning functions; the wings of butterflies, the feet of water striders, and the feathers of waterfowl all have super-hydrophobic properties. At present, through the research and imitation of natural plant leaves, a large number of bionic surfaces with excellent self-cleaning effects emerge in endlessly. If a deeper understanding of the mechanism of action of superhydrophobic surfaces can be obtained, it will undoubtedly have important guiding and practical value for the design and manufacture of new superhydrophobic and self-cleaning surfaces. The rol...

AI Technical Summary

Problems solved by technology

[0005] (1). It can only be tested under normal pressure, which limits the test range of contact angle and rolling angle, and cannot obtain contact angle and rolling angle under variable pressure conditions.

[0006] (2). Under very low temperature conditions such as -20°C, even the outer surface of double-layer quartz glass will form serious water mist, and it is necessary to wipe the window with a cotton ball dipped in antifreeze The surface, the wiping process will block the camera lens image shooting, and the water mist left on the quartz glass surface will change the direction of the optical path, distorting the captured image and causing errors in the results

[0007] (3). The maximum speed of the high-speed camera used is only 420 frames per second, which cannot track the freezing process of water droplets on superhydrophobic surfaces in real time or the bouncing and viscoelastic processes of water droplets on superhydrophobic surfaces in real time.

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