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Novel aluminum material with microscale self-driven dropwise condensation function and preparation method thereof

A droplet condensation and self-driven technology, applied in the field of material science, can solve the problems of micro-droplets detached from the surface, and the research has not been reported yet, and achieve the effect of short cycle, good reproducibility, and excellent superhydrophobic performance

Active Publication Date: 2013-06-26
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in practical applications (such as air-conditioning heat exchange fins), it is often necessary for micro-droplets to detach from the surface quickly, and related research has not yet been reported.

Method used

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  • Novel aluminum material with microscale self-driven dropwise condensation function and preparation method thereof
  • Novel aluminum material with microscale self-driven dropwise condensation function and preparation method thereof
  • Novel aluminum material with microscale self-driven dropwise condensation function and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] (1) Remove the organic grease and inorganic impurities on the surface of the aluminum foil by cleaning or grinding, or use the aluminum foil directly without any treatment.

[0042] (2) With aluminum foil as the anode and platinum electrode as the cathode, the distance between the two electrodes was controlled to be 4 cm, and the phosphoric acid solution with 2 volume fraction was used as the electrolyte to carry out variable voltage oxidation in a constant temperature water bath at 30 °C (control the appropriate rise The pressure rate increases the voltage from 25 V to 110 V, such as 0.5 V / 10s), and the oxidation continues for 100s after the current rises to 1.0 A.

[0043] (3) Electrochemically anodized aluminum foil with N 2 blow dry.

[0044] (4) Then put it into a covered container, drop a drop of fluorosilane in the container, cover the container and put it in an oven at 150 °C for 2 hours. After 2 hours, take the sample out of the oven and cool it to room temper...

Embodiment 2

[0046] (1) Remove organic grease and inorganic impurities on the surface of aluminum foil by cleaning or grinding;

[0047] (2) With the aluminum foil as the anode and the platinum electrode as the cathode, the distance between the two electrodes was controlled to be 5 cm, and 0.3 M oxalic acid solution was used as the electrolyte to carry out constant current oxidation in a constant temperature water bath at 30 °C for 30 min, and the current was kept at 0.4 About A, oxidized for 500 s.

[0048] (3) Put the electrochemically anodized aluminum foil into a covered container, drop a drop of fluorosilane in the container, cover the container and put it in an oven at 100 °C for 2 h, and remove it from the oven after 2 h Take out the sample and cool it down to room temperature, and you can get the aluminum foil with excellent superhydrophobic properties on the surface.

Embodiment 3

[0050] (1) Remove organic grease and inorganic impurities on the surface of aluminum foil by cleaning or grinding.

[0051] (2) Using aluminum foil as the anode and platinum electrode as the cathode, the distance between the two electrodes was controlled to be 4 cm, and 0.3 M sulfuric acid solution was used as the electrolyte to carry out variable voltage oxidation in a constant temperature water bath at 30 °C (control the appropriate boost rate Make the voltage rise from 25 V to 110 V, such as 0.5 V / 5s), and oxidize for 60 s.

[0052] (3) Put the electrochemically anodized aluminum foil into a covered container, drop a drop of FAS in the container, cover the container and put it in an oven at 150 °C for 1 h, take it out of the oven after 1 h The aluminum foil with excellent superhydrophobic properties on the surface can be obtained after the sample is cooled to room temperature.

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Abstract

The invention discloses a novel aluminum material with a microscale self-driven dropwise condensation function and a preparation method thereof. A plurality of nanopores are distributed on the surface of the novel aluminum material; nano protuberance structures are distributed on the tops of the nanopores; and the pores at the nano protuberances are communicated with one another. The preparation method comprises the following steps: placing a cathode and an anode mainly formed by the aluminum material in an electrolyte, thereby forming an oxidation system; applying a scheduled dynamic oxidation process between the cathode and the anode, thereby dynamically regulating the formation and the corrosion degrees of alumina pore walls on the surface of the aluminum material according to the changes of the time, the voltage and the current, i.e., realizing the formation of pore channels and the local over-corrosion of the pore walls on the top of the pores by one step, thus forming composite array structures with nano protuberances on the top of the nanopores. The composite array structures have the excellent the microscale self-driven dropwise condensation function after being decorated by chemical substances with the low surface energy. The preparation method is simple in process and short in period, and is favorable for large-scale production.

Description

technical field [0001] The invention particularly relates to an aluminum or aluminum alloy surface functional nanostructure and a preparation process thereof, belonging to the field of material science. Background technique [0002] As we all know, the growth and retention of dew droplets on the surface of the device greatly reduces the thermal conductivity, and leads to a decrease in the insulation performance of the device, causing short-circuit failures, and also aggravates the corrosion and microbial contamination of the metal surface, shortening the working life of the device. Studies have shown that the above-mentioned hazards caused by condensation can be suppressed or eliminated by changing the wettability of the material surface to form film condensation or drop condensation during condensation. At present, film condensation has been widely used in industrial production. It makes the material surface and condensate have good wettability, and makes the condensate flo...

Claims

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Application Information

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IPC IPC(8): C25D11/06B05D5/08
Inventor 高雪峰陈诚李娟张秀丽
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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