Interfacial rheological testing method and apparatus by using liquid drop imagery

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 ...

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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 method or θ / 2 method, and the content of the patent appeal is interfacial tension Or the mechanical structure design content of the interface chemical property test device such as contact angle

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