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Method for measuring liquid-drop contact angle on solid surface and device thereof

A solid surface and measurement method technology, applied in the field of measurement, can solve the problems of not considering the influence of gravity, not considering the influence, and not being able to give the contact angle well, so as to improve the measurement accuracy and expand the measurement range.

Active Publication Date: 2009-09-23
TSINGHUA UNIV
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  • Application Information

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Problems solved by technology

At present, even the most advanced contact angle measuring instrument in the world cannot give the value of the contact angle very well when the droplet is relatively large or the contact angle is relatively large (such as superhydrophobic materials). big error
One of the main reasons for the error is that the influence of gravity is not considered when measuring the contact angle, and the influence of the volume change on the droplet profile is not considered. Therefore, the measurement accuracy is not very good, and the measurement error ranges from 5 to 10°
However, the liquid droplets in the actual measurement are often affected by gravity. For liquid metals, even if the volume is small, the influence of gravity cannot be ignored.

Method used

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  • Method for measuring liquid-drop contact angle on solid surface and device thereof
  • Method for measuring liquid-drop contact angle on solid surface and device thereof
  • Method for measuring liquid-drop contact angle on solid surface and device thereof

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Experimental program
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Embodiment

[0035] Such as image 3 As shown, the specific implementation is divided into two parts: 1) establishing a database; 2) calculating the contact angle in real time. The specific operation of creating the database is as follows:

[0036] 1) The initial physical constants of the measured droplet are given: surface tension coefficient, density, volume. The initial boundary conditions are given in the process of numerical solution (the contact angle θ is given, in the specific calculation process w 0 = 0, the width r of any given adhesion area 0 | w＝0 and the pressure difference ΔP between the inside and outside of the droplet exiting the substrate 0 | w＝0 ).

[0037] 2) Solve by the shooting method (the formula of the shooting method is r i | w＝0 = r 0 +Δr,ΔP i | w＝0 =ΔP 0 +ΔP);

[0038] 3) Judging whether the final boundary condition is satisfied (that is, the condition of program termination V=V 0 , dw dr ...

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Abstract

The invention relates to a method for measuring a liquid-drop contact angle on a solid surface and a device thereof, which are used for measuring the contact angles of the liquid drops with different mediums and different sizes on the solid surface. The method comprises the following steps of: according to one-to-one correspondence between a liquid drop volume and a liquid drop contact angle, obtaining a plurality of liquid drop profiles which correspond to different contact angles, thus establishing a database used for storing different liquid drop profiles; when in measuring, fixing a sample on an earthquake isolation platform, and dropping the liquid with known volumes on the surface of the sample by utilizing a micro-injector; after the liquid drops achieve balance, acquiring a liquid drop image on the surface of the sample by utilizing an optical imaging system, a CCD camera and a computer; utilizing an image matching method to carry out processing and analyzing to the shapes of the liquid drops by computer software, and then carrying out calculation to obtain contact angles of the liquid drops; and matching the liquid drop profiles obtained by experimental measurements with the liquid drop profiles in the database so as to determine the corresponding contact angles. Compared with the existing method, the method takes the influence of volume and weight of the liquid drop in to consideration, thus improving the measuring precision.

Description

technical field [0001] The invention relates to a method for measuring the contact angle of liquid droplets, which is used for accurately measuring the contact angles of liquid droplets of different media and sizes on solid surfaces, and belongs to the technical field of measurement. Background technique [0002] The interfacial wetting properties characterized by various materials, including organic matter, inorganic substances, and liquid metals, are the focus of research in the field of modern physical chemistry, and the contact angle is an important parameter to characterize the interfacial wetting properties. At present, even the most advanced contact angle measuring instrument in the world cannot give the value of the contact angle very well when the droplet is relatively large or the contact angle is relatively large (such as superhydrophobic materials). A large error occurred. One of the main reasons for the error is that the influence of gravity is not considered w...

Claims

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Application Information

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IPC IPC(8): G01N13/00G01N21/85
Inventor 郑泉水吕存景郝鹏飞
Owner TSINGHUA UNIV
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