A high-efficiency spreading agent that promotes the complete spreading of water droplets impacting on superhydrophobic surfaces

Abstract

The invention discloses a class of high-efficiency spreading agent that promotes the complete spreading of water droplets impacting on a super-hydrophobic surface. The spreading agent is composed of an ionic single-chain surfactant and a small molecule opposite to the charge of the surfactant. For anionic surfactants, the content of surfactants is 0.25%-2.00%, and the concentration of small molecules is 0.10%-1.00%; for cationic surfactants, the content of surfactants is 0.50%-2.00%, and the concentration of small molecules The concentration is 0.25%‑1.00%. The present invention utilizes the electrostatic interaction between charged small molecules and surfactants, thereby significantly reducing the critical aggregation concentration of surfactants, balancing surface tension and dynamic surface tension, and utilizing small molecules to induce abundant aggregates formed by surfactants, The hydrodynamic properties of the solution are changed to realize the complete spreading of water droplets when they hit the superhydrophobic surface, while suppressing the ejection and sputtering behavior of water droplets.

Description

technical field [0001] The invention belongs to the field of surfactant science and application, in particular to a high-efficiency spreading agent based on surfactants. Background technique [0002] The phenomenon of collision between liquid and solid surface widely exists in the fields of power machinery, chemical industry, material science and agricultural production. The state of the liquid after the drop hits the solid surface is a key factor affecting the efficiency of various work. A superhydrophobic surface is a surface with special wettability. There are many such surfaces in nature, such as the leaves of food crops rice and wheat, and the leaves of cabbage, peanuts, cauliflower, taro, and dogtail grass. As we all know, droplets are prone to ejection when they hit the superhydrophobic surface at low speed, and sputtering when they hit at high speed. This behavior of ejection and sputtering will cause a lot of waste of effective substances, which seriously affects th...

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Problems solved by technology

In addition, printing on superhydrophobic surfaces can efficiently prepare high-precision electronic devices and biological arrays for disease detection. The realization of both requires a very regular and controllable spreading area of ​​droplets when they hit superhydrophobic surfaces, but So far, there are few inks that can be directly printed on superhydrophobic surfaces and spread regularly

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