Method for driving self-assembly coating to be rapidly prepared based on evaporation induced tension gradient

Abstract

The invention provides a method for driving a self-assembly coating to be rapidly prepared based on the evaporation induced tension gradient. The method includes the steps that a colloidal solution isprepared, wherein the colloidal solution includes a solvent and colloidal particles dispersed in the solvent, the solvent comprises first liquid and second liquid, the second liquid is dissolved in the first liquid, the boiling point of the second liquid is lower than that of the first liquid, and the surface tension of the second liquid is lower than that of the first liquid; a substrate with apreset temperature is immersed in the colloid solution vertically according to the preset speed, the second liquid is evaporated, the concentration gradient is generated in the colloidal solution, then the tension gradient is caused, and the colloidal particles are driven to move towards the substrate and are adsorbed to the substrate; and the substrate is taken out and dried. The method has the beneficial effects that the technology is simple and convenient, the preparing speed is high, the cost is low, control is easy, and the colloidal film coating can be rapidly prepared with large area.

Description

technical field [0001] The invention relates to a method for rapid preparation of an evaporation-induced tension gradient-driven self-assembly coating, in particular to a method with simple process, low cost, no need for surface modification of particles or substrates in colloidal solution, suitable for different particles, and can be applied A method for rapid self-assembly of colloidal particles on substrate surfaces such as flat, curved, and mesh surfaces. Background technique [0002] A coating is a solid film that covers a substrate. The purpose of applying a coating can be decorative, functional, or both. The substrate can be metal, fabric, plastic, etc. Functional coatings can be used to change the surface properties of substrates, such as adhesion, wettability, corrosion resistance, wear resistance, thermal conductivity, electrical conductivity, magnetic permeability, etc. The function exhibited by the coating depends mainly on the nature of the coating applied. Fo...

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Problems solved by technology

The pulling method is sensitive to environmental factors and requires specialized precision pulling equipment. The most important thing is that the method requires a very low pulling speed, so it cannot be prepared in a large area, making it difficult to be widely used in industrial production

The electrostatic force method usually needs to chemically modify the surface of the substrate or particle with charged groups, thereby changing its surface charge, which will affect the physicochemical properties of the substrate or particle and cause chemical reagents to remain in the self-assembled coating, and the method The operation process is cumbersome and random, and the movement of particles to the range of electrostatic forces near the wall or direct collision with the substrate itself is a thermodynamic random process, so it takes a long time to assemble

The two-phase interface method requires colloidal particles to form a film at the liquid-air interface or liquid-liquid interface, so the particles need to be modified to obtain a suitable contact angle, which will affect the physical and chemical properties of the substrate or particles, and then the substrate needs to be used to form a film. The film is transferred from the interface to the substrate surface, and the operation is more cumbersome

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