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Method and device for measuring advancing contact angle, receding contact angle and retention force of liquid on solid surface

A receding contact angle, solid surface technology, applied in the direction of measuring devices, surface/boundary effects, instruments, etc., can solve problems such as poor repeatability, influence of wettability measurement results, droplet asymmetry, etc., to achieve the measurement device Simplicity, high measurement accuracy and repeatability, and easy-to-operate results

Active Publication Date: 2018-06-15
NINGBO NB SCI INSTR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is generally only applicable to systems with relatively large contact angles, and it is often accompanied by various problems in the actual operation process (such as the droplet presents serious asymmetry); in addition, when measuring the receding contact angle The wettability of the capillary will affect the measurement results, resulting in poor repeatability of this value

Method used

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  • Method and device for measuring advancing contact angle, receding contact angle and retention force of liquid on solid surface
  • Method and device for measuring advancing contact angle, receding contact angle and retention force of liquid on solid surface
  • Method and device for measuring advancing contact angle, receding contact angle and retention force of liquid on solid surface

Examples

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Embodiment 1

[0036] Example 1: A device for measuring the advancing contact angle, receding contact angle and retention force of a liquid on a solid surface, as shown in the appendix. figure 1 As shown, a base 1 is included, a mobile platform 2 is arranged in the base 1, the mobile platform 2 includes a vertical mobile platform 3 fixed on the base 1, a horizontal mobile platform 4 is provided on the vertical mobile platform, and a machine is provided on the horizontal mobile platform 4. Frame 14, a motor 5 is fixed in the frame 14, the motor 5 is connected with a rotating shaft 6 through a transmission belt, the rotating shaft is erected in the center of the frame 14, and a rotary encoder 7 is connected below the rotating shaft 6, and the rotary encoder emits A Phase pulse, B-phase pulse and Z-phase pulse, A-phase pulse and B-phase pulse are used to detect the rotation speed of the rotating plane in real time, Z-phase pulse is used to detect the rotation displacement of the rotating plane i...

Embodiment 2

[0048] Example 2: A device for measuring the advancing contact angle, receding contact angle and retention force of a liquid on a solid surface, as shown in the appendix. figure 2 As shown, a base 1 is included, a mobile platform 2 is arranged in the base 1, the mobile platform 2 includes a vertical mobile platform 3 fixed on the base 1, a horizontal mobile platform 4 is provided on the vertical mobile platform, and a machine is provided on the horizontal mobile platform 4. A frame 14, a motor 5 is fixed in the frame 14, the motor is a stepping motor, the motor 5 is connected with a rotating shaft 6 through a transmission belt, the rotating shaft is erected in the center of the frame 14, and a shading disc 17 is fixed below the rotating shaft 6, A photoelectric sensor 15 is fixed at the corresponding position of the shading disc 17 in the frame 14. During the rotation of the photoelectric sensor 15, a cyclic pulse signal is sent to the controller. After receiving the pulse sig...

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Abstract

The invention discloses a method and a device for measuring the advancing contact angle, receding contact angle and retention force of a liquid on a solid surface. In the present invention, the rotating plane is placed between the background light source and the camera lens, the solid sample to be tested is fixed on the rotating plane, and a unit liquid droplet is dropped on the surface of the solid sample to be tested. When the rotating plane rotates to the trigger position, the camera gets The trigger signal is used to capture the droplet; the advancing contact angle, receding contact angle and retention force of the droplet on the surface of the fixed sample are calculated according to the image of the droplet captured by the camera. The present invention has the characteristics of simple structure, convenient operation, wide application range, high measurement accuracy and good repeatability; in addition, the present invention can be easily integrated into an ordinary optical contact angle measuring instrument to complete traditional tilting table measurement A variety of measurements cannot be accomplished by the method and the droplet volume increase and decrease method.

Description

technical field [0001] The present invention relates to a method and device for measuring liquid / fluid / solid-interface parameters of a liquid on a solid surface, in particular to measuring the advancing contact angle, receding contact angle, wettability, adhesive force and Method and device for measuring liquid / fluid / solid-interface parameters such as retention / retentive force. Background technique [0002] The wettability of liquid on solid surface, contact angle and its hysteresis (CAH), as well as the phenomenon of droplet adhesion and retention on solid surface are important liquid / fluid / solid-interface parameters , involving many aspects of basic theoretical research and practical applications (Geoff Mercer et al., ProcessDriven Models for Spray Retention by Plants. In Wake, G. (Ed.) Proceedings of the2006 Mathematics-In-Industry Study Group, 30January-3February 2006 , New Zealand, Auckland), such as the spraying of pesticides on the surface of plant leaves, the conden...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N13/00
Inventor 宋碧海宋少佩
Owner NINGBO NB SCI INSTR CO LTD