Interfacial rheological testing method and apparatus by using liquid drop imagery

A test method and interface technology, applied in the direction of measurement device, flow characteristics, surface tension analysis, etc., can solve problems such as Young-lapalace equation fitting technology that is not mentioned

Active Publication Date: 2013-03-06
上海梭伦信息科技有限公司
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Problems solved by technology

[0008] 2) The patent does not mention Young-lapalace equation fitting technology, but only mentions the simplest numerical calculation technology of contact angle such as circle fitting, WH me

Method used

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  • Interfacial rheological testing method and apparatus by using liquid drop imagery
  • Interfacial rheological testing method and apparatus by using liquid drop imagery
  • Interfacial rheological testing method and apparatus by using liquid drop imagery

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Embodiment Construction

[0049] Below in conjunction with accompanying drawing and embodiment the present invention is further illustrated and described

[0050] The mechanical structure of the analytical instrument of the present invention is a universal structural design. In this patent, the improved instrument structure is adopted, and when the image analysis method is used to test the interface chemistry and interface rheological properties, the methods adopted include:

[0051] 1. Form a droplet and take an image of the droplet

[0052] Such as Figure 6 The shown test device or similar instrument includes a control sampling system or a centrifugal motor system (rotating drop), uses a CCD imaging system to obtain images of droplets, and saves the images in BMP or TIF format for use. The specific operation steps are as follows: :

[0053] (1) Suction liquid: fix the micro-sampler on the suction and liquid-feeding control parts of the rotary micro-sampler, and suck the liquid phase sample;

[00...

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Abstract

The invention discloses an interfacial rheological testing method and an interfacial rheological testing apparatus by using liquid drop imagery. According to the invention, after least squares fitting and secondary optimization by using a Newton iteration method are carried out on a discretized Young-lapalace equation theoretical calculated curve and an actual liquid drop contour boundary curve, interfacial chemical properties like surface tension, interfacial tension and a contact angle value, the volume, the area and the wetting line of liquid drops, etc. can be calculated; then interfacial rheological properties like interfacial dilational elasticity Epsilon d and interfacial dilational viscosity Eta d can be obtained through analysis by using an interfacial tension relaxation method; a set of liquid drop sample introduction system and a set of testing apparatus are provided, liquid drop oscillation is realized through corresponding control software so as to increase or reduce the amount of liquid drops and allow oscillation process to accord with sine, cosine, square wave and sawtooth changes. The apparatus provided by the invention enlarges the application field of optical interface chemical analysis apparatuses and meets requirements for high-precision automatic testing of dynamic/static contact angle values, dynamic/static surface tension values, interfacial tension values and interface rheological measurement values.

Description

technical field [0001] The invention relates to a measurement method and device for testing interface chemistry and interfacial rheological properties by using a droplet image analysis method, in particular to a droplet image method interface rheology test method and device. Background technique [0002] Indicators such as liquid-liquid interfacial tension, liquid-gas surface tension, solid-liquid contact angle, and interfacial rheological properties are the basic parameters to characterize the physical and chemical properties of substances; at present, the widely used methods are usually the DuNouy ring method and the platinum method. Surface chemical analysis instruments such as the Wilhelmy plate method, the largest bubble method, and the drop volume method, while the interface chemical analysis instruments based on the optical method have long been affected by the level of computer development, algorithm and software development difficulties, and the development speed is ...

Claims

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Application Information

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IPC IPC(8): G01N13/00G01N13/02G01N11/00
Inventor 施建辉
Owner 上海梭伦信息科技有限公司
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