Method for inducing wettability changes of super-hydrophobic film through solvent and application

A super-hydrophobic and wettability technology, which is applied in the field of solvent-induced wettability changes of super-hydrophobic films, can solve problems such as unevenness, poor repeatability of deposited film structures, and inability to effectively control the position, and achieve the effect of diverse structures and uniform scales

Inactive Publication Date: 2016-10-12
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] But so far, solvent-induced wettability changes and methods for inducing droplet motion in responsive wettable materials to various external stimuli have not been reported.
[0004] In addition, when electrodes with micro-nano-structured films are used for electrodeposition, due to the difference in wettability of the substrate to the electrolyte, the position of electrodeposition on the surface of each micro-nano array structural unit of the film cannot be effectively controlled, and the deposited film usually obtained Structure repeatability is poor and uneven

Method used

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  • Method for inducing wettability changes of super-hydrophobic film through solvent and application
  • Method for inducing wettability changes of super-hydrophobic film through solvent and application
  • Method for inducing wettability changes of super-hydrophobic film through solvent and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The micro-nano array structure film is selected to be a zinc oxide nanorod array structure with a rod diameter of 50 nm and a rod length of 0.3 μm. After 2 hours of hydrophobization treatment in a fluorosilane atmosphere, it is taken out to obtain a super-hydrophobic film.

[0028] Such as figure 1 As shown, a 5 μl water droplet is dropped on the superhydrophobic film. At this time, the water droplet presents a superhydrophobic state (CA=155°). After the solvent evaporates naturally, the water droplets assume a hydrophilic state (CA=90°), and the wettability of the film changes by 65° during this process.

[0029] Such as figure 2 As shown, a 5 μl water droplet is dropped on the superhydrophobic film. At this time, the water droplet presents a superhydrophobic state (CA=155°). , so that after the solvent is naturally volatilized, the water droplet presents a hydrophilic state (CA=78°), and the droplet drive is realized. During this process, the wettability of the fil...

Embodiment 2

[0034] The micro-nano array structure film is selected as a zinc oxide micro-tube array structure. The diameter of the micro-tube is 200 μm, and the tube length is 500 μm. It is taken out after 2 hours of hydrophobization treatment in a fluorosilane atmosphere, and a super-hydrophobic film is obtained.

[0035] Such as figure 1 As shown, a 5 μl water droplet is dropped on the superhydrophobic film. At this time, the water droplet presents a superhydrophobic state (CA=155°). Under normal conditions, after the solvent volatilized naturally, the water droplets showed a hydrophobic state (CA = 136°), and the wettability of the film changed slightly during this process, with a change of 19°.

[0036] Such as figure 2 As shown, drop 5 μl of water droplets on the obtained superhydrophobic film. At this time, the water droplets present a superhydrophobic state (CA=155°). Under this condition, after the solvent evaporates naturally, the water droplet presents a hydrophilic state (CA...

Embodiment 3

[0040] The micro-nano array structure film is selected as a silica nanotube array structure. The diameter of the nanotubes is 200nm and the length of the tube is 1μm. It is taken out after hydrophobization treatment in a fluorosilane atmosphere for 2 hours, and a superhydrophobic film is obtained.

[0041] Such as figure 1 As shown, a 5 μl water droplet is dropped on the superhydrophobic film. At this time, the water droplet presents a superhydrophobic state (CA=155°). , so that after the solvent evaporates naturally, the water droplet assumes a hydrophilic state (CA=88°), and the wettability of the film changes by 67° during this process.

[0042] see figure 2 , drop 5 μl of water droplets on the super-hydrophobic film. At this time, the water droplets are in a superhydrophobic state (CA=155°). After using 6 μl of n-hexane to drop on one side of the water droplets, under the interaction between the water droplets and the solvent, the to-be After the solvent evaporates natu...

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Abstract

The invention discloses a method for inducing the wettability changes of a super-hydrophobic film through a solvent. The method comprises the steps that a film is subjected to hydrophobization treatment to obtain the super-hydrophobic film; a water drop is dropwise added on the super-hydrophobic film, and the solvent for inducing the wettability changes of the prepared super-hydrophobic film is dropwise added over or at one side the water drop; after the solvent is naturally volatilized, the water drop is in a hydrophilic or hydrophobic state, and then the wettability of the super-hydrophobic film changes, wherein one of volatile organic solvents such as dichloromethane, dichloroethane, n-hexane and tetrahydrofuran is adopted as the solvent for inducing the wettability changes of the prepared super-hydrophobic film. The method that the wettability changes is induced by the solvent can be applied to liquid drop driving and has the important significance on the aspect of regulating the contact mode of liquid and electrodes in electro-deposition.

Description

technical field [0001] The invention relates to a method for changing the wettability of a superhydrophobic thin film induced by a solvent, and the application of the liquid droplet driven by the wettability change method in adjusting the contact mode of the liquid and the electrode in electrodeposition. Background technique [0002] The study of responsive materials, especially the driving and transportation regulation of liquids by smart surfaces / interfaces, is of great significance, and has a very broad application prospect in the fields of transfer, separation, and micro-testing. Wettability control is achieved by changing the properties of responsive materials through external stimuli, such as the molecular structure, chemical composition, and surface morphology of materials. Recently, researchers have realized that the responsive material surface is stimulated by external field, such as light (reference [1]: X.J.Feng, J.Zhai, L.Jiang, Angew.Chem.Int.Ed.2005,44,5115), ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/46C08J9/40C08J7/12C08J7/02C08L25/06C08L83/04C08L33/12C08L69/00C08L23/06C08L23/12C08L27/06C08L77/00
CPCC04B41/46C04B41/466C08J7/02C08J7/12C08J9/40C08J2323/06C08J2323/12C08J2325/06C08J2327/06C08J2333/12C08J2369/00C08J2377/00C08J2383/04
Inventor 田东亮张娜张孝芳何琳琳江雷
Owner BEIHANG UNIV
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