Method for improving stability of super-hydrophobic surface underwater air layer

A super-hydrophobic surface and air layer technology, which is applied in the process, coating, gaseous chemical plating and other directions for producing decorative surface effects, can solve the problems of complex methods, high cost, complex equipment, etc., and achieve simple equipment and reliable The effect of good control and wide substrate selectivity

Active Publication Date: 2020-01-17
DALIAN MARITIME UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] According to the above-mentioned existing design routes for improving the stability of the underwater air layer, there are technical problems such as comp

Method used

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  • Method for improving stability of super-hydrophobic surface underwater air layer
  • Method for improving stability of super-hydrophobic surface underwater air layer
  • Method for improving stability of super-hydrophobic surface underwater air layer

Examples

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Embodiment 1

[0037] This embodiment provides a method for stabilizing the underwater air layer on an aluminum sheet as a substrate.

[0038] The aluminum sheet is selected as the substrate, and the rough surface is obtained by chemical etching. The aluminum sheet was corroded with 3 mol / L hydrochloric acid for 10 minutes, ultrasonically cleaned in deionized water for 5 minutes, and blown dry with nitrogen gas. Afterwards, it was modified with perfluorodecyltrichlorosilane and dried in an oven at 120°C for 2 hours to obtain a superhydrophobic surface. The superhydrophobic surface was immersed in 0.1 mol / L Tris-dopamine buffer solution for 10 minutes, and then dried at room temperature to obtain a rough structure superhydrophobic surface modified by the top hydrophilic substance-polydopamine. SEM photographs of the surface (eg figure 1 ) indicates that the surface has a micro-nano composite structure, and its size is from 10 nanometers to 10 microns. X-ray photoelectron spectroscopy (such...

Embodiment 2

[0040] This embodiment provides a method for stabilizing the underwater air layer on a superhydrophobic surface with polystyrene as the substrate.

[0041] Polystyrene is selected and the rough structured surface is obtained by phase separation method. Chloroform is used as a solvent to prepare a polystyrene solution with a weight fraction of 20%. The solution is spin-coated on a polystyrene substrate at a humidity of 80%, and then dried at 25°C for 24 hours to obtain a superhydrophobic surface. . The superhydrophobic surface was soaked in 0.15 mol / L Tris-dopamine buffer solution for 8 minutes, and then dried at room temperature to obtain a rough-structured superhydrophobic surface modified with hydrophilic substances at the top.

Embodiment 3

[0043] This embodiment provides a method for stabilizing the underwater air layer on a superhydrophobic surface using polydimethylsiloxane as a substrate.

[0044] Polydimethylsiloxane was selected to obtain rough structured surface by template method. Prepare dimethylsiloxane and curing agent in a weight ratio of 10 / 1, stir evenly and remove air bubbles. Select 800 mesh sandpaper and drop-coat trimethylchlorosilane as an anti-adhesive agent. Then pour the prepared mixture onto the sandpaper surface treated with the anti-adhesive agent above, vacuumize in the vacuum container, and then transfer to an oven with a temperature of 60° C. for curing for 4 hours. The cured polydimethylsiloxane film and sandpaper are peeled off to obtain a micro-nano composite rough structure polydimethylsiloxane surface with a reverse structure of sandpaper. The surface is treated with a weight fraction of 0.1% methyltrichlorosilane- Hydrophobic modification was carried out in toluene solution, an...

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Abstract

The invention provides a method for improving the stability of an underwater air layer on a super-hydrophobic surface, and belongs to the field of super-hydrophobic surfaces. The method is achieved bysoaking a super-hydrophobic surface in a dopamine buffer solution, so that the top end of the obtained super-hydrophobic surface microstructure is modified by a hydrophilic substance-polydopamine, and other parts are still hydrophobic; the Laplace pressure of an underwater air layer on the super-hydrophobic surface is improved through hydrophilicity at the top end of the super-hydrophobic surfacemicrostructure, and then the stability of the underwater air layer on the super-hydrophobic surface is improved. The method has the characteristics of simple equipment, good controllability, wide substrate selectivity, capability of being implemented on any super-hydrophobic surface and the like.

Description

technical field [0001] The invention relates to the technical field of super-hydrophobic surfaces, in particular to a method for improving the stability of an underwater air layer on a super-hydrophobic surface. Background technique [0002] Superhydrophobic surfaces have important applications in the fields of antifouling, drag reduction, and anti-icing of underwater hulls, among which the stability of the underwater air layer on superhydrophobic surfaces is the most critical factor for its function. When the superhydrophobic surface is underwater, fluid flow, static pressure and immersion time will accelerate the diffusion or even loss of the air layer. Therefore, the stability of the underwater air layer on the superhydrophobic surface is particularly important. [0003] At present, the methods to improve the stability of the underwater air layer mainly take the following routes: [0004] 1. Build a multi-level microstructure on the surface of the substrate. For example...

Claims

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Application Information

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IPC IPC(8): B81C1/00B63B1/40B63B59/04C08J7/12C08J7/16B82Y40/00C08L25/06C08L83/04
CPCB81C1/00642B81C1/00349B81C1/00023B63B1/40B63B59/045C08J7/16C08J7/12B82Y40/00C08J2325/06C08J2383/04Y02T70/10
Inventor 金美花张雨柔周凯
Owner DALIAN MARITIME UNIVERSITY
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