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Method for calculating static contact angle of hydrophobic material

A static contact angle and calculation method technology, applied in the direction of analyzing materials, measuring devices, instruments, etc., can solve the problems of inaccurate calculation of static contact angle and low calculation efficiency, and achieve the goal of low programming difficulty, high efficiency and guaranteed accuracy Effect

Inactive Publication Date: 2015-01-07
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
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Problems solved by technology

[0004] The purpose of the present invention is to propose a method for calculating the static contact angle of hydrophobic materials, which can solve the problems of inability to accurately calculate the static contact angle and low calculation efficiency in the above-mentioned technology

Method used

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  • Method for calculating static contact angle of hydrophobic material
  • Method for calculating static contact angle of hydrophobic material
  • Method for calculating static contact angle of hydrophobic material

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Embodiment 1

[0153] A bead edge was generated based on the Young-Laplace equation with a contact angle of 120.13 degrees and a volume of 2.02 microliters. Figure 4 Shown are the original water drop edge and the corresponding contact angle based on the Young-Laplace equation, the water drop edge and the calculated contact angle obtained by the present invention, the water drop edge and the ADSA-P algorithm obtained under two kinds of initial value situations corresponding contact angle.

[0154] attached by Figure 4 It can be seen that the droplet edge and the corresponding contact angle of the Young-Laplace equation, that is, the droplet edge and the corresponding contact angle in the real situation, the real value of the contact angle is 120.13 degrees.

[0155] The contact angle obtained by the present invention is 119.98 degrees, and the difference with the real value is only 0.15 degrees, which is very small.

[0156] The result of ADSA-P algorithm and the initial value [b; c; α; X...

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Abstract

The invention discloses a method for calculating the static contact angle of a hydrophobic material in the technical field of material surface energy detection. The invention adopts the technical scheme that the method comprises the following steps: deducing to obtain the approximate solution of a Young-Laplace equation satisfied by the edge of a liquid drop on the plane, shooting by a camera perpendicular to the surface of a base material to obtain a liquid drop image, and extracting to obtain the edge of the liquid drop; determining the theoretical edge of the liquid drop according to the density and surface tension of the liquid and the maximum radius of the liquid drop obtained by extraction, and calculating the static contact angle by a bisection method according to the height of the liquid drop. According to the method, the complicated iterative computation is not required, the efficiency is relatively high, and the accuracy is guaranteed when the volume of the liquid drop is small.

Description

technical field [0001] The invention belongs to the technical field of material surface energy detection, and in particular relates to a method for calculating a static contact angle of a hydrophobic material. Background technique [0002] Hydrophobicity is an important property of the material surface, which can be reflected by the contact angle. The static contact angle usually refers to the corresponding contact angle when the droplet is in a horizontal static state, which satisfies the Young-Laplace equation. [0003] The most commonly used measurement method for static contact angle is the sessile drop method, and the key part of contact angle measurement is the calculation of contact angle. Theoretically, regardless of the droplet volume and contact angle, the edge of the droplet on the image after the droplet imaging on the plane satisfies the Young-Laplace equation, the axisymmetric shape analysis method (axissymmetric drop shape analysis-profile, ADSA-P) through Ne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N13/00
Inventor 徐志钮
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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