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Engineering surface for improving underwater bubble locking capacity and preparation method thereof

A bubble-capable, super-hydrophobic surface technology, applied in special surfaces, pre-treatment surfaces, devices for coating liquids on surfaces, etc., can solve the problems of loss of super-hydrophobic properties, easy loss of underwater bubbles, etc., and achieve stable super-hydrophobic properties , The preparation process is simple and easy to implement, and the practicability is strong.

Active Publication Date: 2018-08-10
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problem that the underwater bubbles on the surface of the existing superhydrophobic materials are easy to lose, thereby losing the superhydrophobic performance, the present invention designs a brand new superhydrophobic / superhydrophilic array distribution surface, which greatly improves the underwater solid / liquid / gas three The energy barrier of the phase interface forces the three-phase line to not move, and realizes the tight "locking" effect of the microbubbles spontaneously captured in the superhydrophobic region, and finally enables the entire surface to tightly seal a certain number of microbubbles

Method used

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  • Engineering surface for improving underwater bubble locking capacity and preparation method thereof
  • Engineering surface for improving underwater bubble locking capacity and preparation method thereof
  • Engineering surface for improving underwater bubble locking capacity and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0026] The construction method of the superhydrophobic / superhydrophilic array surface of the present invention that can greatly improve the ability to "lock" bubbles underwater is as follows:

[0027] The first step is to use aluminum alloy as the base material, wire-cut it into a size of 10cm×10cm×1mm, use No. 1 to No. 6 metallographic sandpaper to polish the surface of the aluminum alloy, and then ultrasonically in acetone, absolute ethanol and deionized water After washing for 15 minutes, dry it for later use;

[0028] In the second step, using the electrochemical etching method, the aluminum sheet is used as the anode, the platinum sheet is used as the cathode, the NaCl electrolyte concentration is 0.1mol / L, the voltage is 6V, and the etching time is 2h to obtain a microstructure on the surface of the substrate.

[0029] In the third step, the superhydrophobic shape of the design unit is a square with a side length of 1cm, and the distance between each square is 0.2cm. Wa...

Embodiment 2

[0033] The construction method of the superhydrophobic / superhydrophilic array surface of the present invention that can greatly improve the ability to "lock" bubbles underwater is as follows:

[0034] The first step is to use aluminum alloy as the base material, wire-cut it into a size of 10cm×10cm×1mm, use No. 1 to No. 6 metallographic sandpaper to polish the surface of the aluminum alloy, and then ultrasonically in acetone, absolute ethanol and deionized water After washing for 20 minutes, dry it for later use;

[0035] In the second step, using the electrochemical etching method, the aluminum sheet is used as the anode, the platinum sheet is used as the cathode, the NaCl electrolyte concentration is 0.1mol / L, the voltage is 6V, and the etching time is 2h to obtain a microstructure on the surface of the substrate.

[0036] In the third step, the super-hydrophobic shape of the design unit is a circle with a diameter of 1 cm, and the distance between the centers of two adjacen...

Embodiment 3

[0040] The construction method of the superhydrophobic / superhydrophilic array surface of the present invention that can greatly improve the ability to "lock" bubbles underwater is as follows:

[0041] The first step is to use aluminum alloy as the base material, wire-cut it into a size of 10cm×10cm×1mm, use No. 1 to No. 6 metallographic sandpaper to polish the surface of the aluminum alloy, and then ultrasonically in acetone, absolute ethanol and deionized water After washing for 10 minutes, dry it for later use;

[0042] The second step is to use the method of electrochemical etching, using the aluminum sheet as the anode and the platinum sheet as the cathode, the concentration of the NaCl electrolyte is 0.1mol / L, the voltage is 8V, and the etching time is 2h to obtain the microstructure on the surface of the substrate.

[0043]In the third step, the super-hydrophobic shape of the design unit is a circle with a diameter of 1 cm, and the distance between the centers of two adj...

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Abstract

The invention discloses an engineering surface for improving underwater bubble locking capacity and a preparation method thereof. The preparation method comprises the steps that a metal or composite is adopted as a matrix; a microstructure with certain roughness is established on the surface through a conventional superhydrophobic surface microstructure establishing method; a designed superhydrophilic region is sealed through a waterproof adhesive tape; then, a sample is modified through a low-surface energy modifier; the adhesive tape prevents low-surface free energy functional groups in themodifier from being in contact with the surface, so that a superhydrophilic characteristic is presented in the region sealed by the adhesive tape, and a superhydrophobic property is presented in a region not sealed by the adhesive tape due to the synergistic effect of the microstructure and the low surface free energy; and finally, the adhesive tape on the surface is removed, the superhydrophobic / superhydrophilic array distribution surface is obtained, and relatively high underwater bubble locking capacity is presented. According to the method provided by the invention, a technology is simple,stability of microbubbles when a superhydrophobic surface is underwater is improved, and the method has important practical meaning for improving industrial application of a superhydrophobic material.

Description

technical field [0001] The invention belongs to the technical field of surface treatment of metal substrates, in particular to a superhydrophobic engineering surface capable of greatly improving the ability to "lock" bubbles underwater and a preparation method thereof. Background technique [0002] Due to the special microstructure and low surface energy, the superhydrophobic surface exhibits excellent water repellency, which has broad application prospects in the fields of self-cleaning, anti-corrosion, fluid drag reduction, anti-biological adhesion, and underwater oil pollution treatment. . The microstructure of the superhydrophobic surface has a very important influence on the wettability. On a superhydrophobic surface with a certain rough structure, the droplets cannot completely fill the grooves in the microstructure, and there will be gaps between the droplets and the grooves. A large amount of air is trapped, so that the actual contact interface between the solid sur...

Claims

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Application Information

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IPC IPC(8): B05D5/00B05D7/14B05D7/02B05D3/10B05D3/02B05D1/32
CPCB05D1/325B05D3/0254B05D3/101B05D3/102B05D3/107B05D5/00B05D7/02B05D7/14B05D2202/10B05D2202/25B05D2202/35B05D2350/35B05D2504/00
Inventor 陶杰沈一洲金明明许杨江山
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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