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Stable superhydrophobic metal surface with three-dimensional three-stage micro-nano structure and preparation method thereof

A technology of micro-nano structure and metal surface, applied in metal material coating process, nanotechnology for materials and surface science, nanotechnology, etc. The problems of low-level structure and Cassie state stability of superhydrophobic surface are achieved, and the effect of good structural stability and mechanical durability, increasing complexity and roughness can be achieved.

Active Publication Date: 2019-06-14
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent documents CN101216406A, CN101256132A, CN101819125A and CN105550476A have proposed the structural design of the superhydrophobic surface to maintain a stable Cassie state from the perspective of theoretical calculations, and have theoretically predicted the superhydrophobic stability of the surface with a micron structure, but these patented technologies are all It is limited to the analysis of single-level micro-structures (such as micro-grating structures, micro-column array structures, etc.), and does not involve nano-structures and micro-nano multi-level structures, and the above patented technologies are still in the theoretical research stage, and do not involve super-hydrophobic surfaces. Experiment preparation
[0007] From the above research status, it can be seen that there are relatively few studies on the stability of Cassie states on superhydrophobic surfaces, and they mainly focus on single-level structures or simple micro-nano double-level structures. The stability of the Cassie state on the hydrophobic surface is low and needs to be further improved

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  • Stable superhydrophobic metal surface with three-dimensional three-stage micro-nano structure and preparation method thereof
  • Stable superhydrophobic metal surface with three-dimensional three-stage micro-nano structure and preparation method thereof
  • Stable superhydrophobic metal surface with three-dimensional three-stage micro-nano structure and preparation method thereof

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preparation example Construction

[0030] Concrete preparation method of the present invention comprises the steps:

[0031] 1) Pretreatment of the metal substrate: make the surface smooth and smooth, remove the oxide layer, and perform ultrasonic cleaning in absolute ethanol and acetone solutions in turn;

[0032] 2) Preparation of dense micro-cone structure base on the surface of the metal substrate: using a high-power ultrafast pulsed laser to perform selective patterned ablation on the metal surface to process the required three-dimensional dense micro-cone structure base; the high-power Ultrafast pulsed lasers are picosecond or femtosecond lasers;

[0033] 3) Preparation of nanostructures and microspheres or microflowers on the surface of the dense microcone structure base: the above-mentioned sample whose surface is the basis of the three-dimensional dense microcone structure is placed in the prepared oxidation reaction system, and the oxidation reaction system has a concentration of A mixed aqueous solu...

Embodiment 1

[0037] 1) Using metal copper as the base material, first use mechanical cutting to obtain a block copper-based sample with a size of 10mm × 10mm × 6mm, and then use 200#, 400#, 800#, 1000# and 1500# metallographic sandpaper to sand the copper The surface of the base sample was ground and polished step by step, and finally placed in absolute ethanol and acetone for ultrasonic cleaning for 10 to 20 minutes, and then dried in a gentle nitrogen stream after taking it out.

[0038] 2) Perform periodic patterned ablation on the surface of the copper-based sample by using a high-power ultrafast laser. The laser wavelength is 1030nm, the pulse width is 800fs, the pulse repetition frequency is 200kHz, and the laser power is 15W. Processing, the distance between adjacent scanning lines is 60 μm, the scanning speed is 700 mm / s, and the height of the three-dimensional microcone unit is 90 μm, the diameter of the bottom is about 60 μm, and the period is 60 μm. After the ablation is complete...

Embodiment 2

[0043] 1) Using metal copper as the base material, first use mechanical cutting to obtain a block copper-based sample with a size of 10mm×10mm×6mm, and then use 200#, 400#, 800#, 1000# and 1500# metallographic sandpaper to The surface of the copper-based sample was ground and polished in sequence, and finally ultrasonically cleaned in absolute ethanol and acetone for 10 to 20 minutes, and then dried in a gentle nitrogen stream after taking it out.

[0044] 2) Periodic patterned ablation is performed on the surface of the copper-based sample by using a high-power ultrafast laser. The laser wavelength is 532nm, the pulse width is 10ps, the pulse repetition frequency is 600kHz, and the laser power is 20W. Scanning processing, the distance between adjacent scanning lines is 20 μm, the scanning speed is 100 mm / s, and the height of the three-dimensional microcone unit is 20 μm, the bottom diameter is about 30 μm, and the period is 30 μm. After the ablation is completed, the sample is p...

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Abstract

The invention discloses a stable superhydrophobic metal surface with a three-dimensional three-stage micro-nano structure and a preparation method thereof, and belongs to the technical field of structuring functional surfaces. The metal surface contains the three-stage micro-nano structure, the structure is based on a three-dimensional micron cone structure distributed on the surface of a metal substrate, one-dimensional nanorods, nanotubes or two-dimensional nanosheets densely growing radially are distributed on the surfaces of the micron cones, and micron balls or micron flowers are distributed on the surfaces of the micron cones and among the micron cones. The preparation method adopts a composite method combining ultra-fast laser ablation and chemical oxidation for preparation, and then through chemical modification of the surface with low free energy, the high-stable super-hydrophobic self-cleaning function is realized, and the contact angle can be still larger than 150 degrees when bearing the Laplace pressure being up to 1400Pa. The method has the advantages of high efficiency, capable of being controlled and large-area preparation, and can be widely used in the applicationfields of superhydrophobic self cleaning, anti-icing, anti-corrosion, anti-pollution, anti-bacterial, water collection, resistance reduction, oil and water separation and the like.

Description

technical field [0001] The invention relates to a three-dimensional three-level micro-nano structure highly stable super-hydrophobic metal surface and its preparation method, in particular to a super-hydrophobic metal surface with three-level micro-nano structure complexity, architecture controllability and high Cassie state stability Structure and its composite preparation method of ultrafast laser ablation combined with chemical oxidation, belonging to functional materials and its preparation technology field. Background technique [0002] The magical nature has formed many strange phenomena in the long-term biological evolution, one of which is the super-hydrophobic phenomenon. Common natural super-hydrophobic surfaces include lotus leaves, mosquito compound eyes, butterfly wings, etc. Water droplets present a Cassie state on these superhydrophobic surfaces, that is, they exhibit a contact angle greater than 150° and a rolling angle less than 10°, and can roll freely on ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/63C23C22/78C23C22/83B82Y30/00B82Y40/00
Inventor 钟敏霖张红军潘瑞
Owner TSINGHUA UNIV
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