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Control method of liquid drop bounce direction based on surface wetting gradient

A control method and droplet technology, which are applied in the process of producing decorative surface effects, manufacturing microstructure devices, gaseous chemical plating, etc., can solve the problems of high cost, unstable performance, and many steps, and achieve low cost. , the effect of easy operation

Inactive Publication Date: 2019-05-03
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to propose an integrated molding method of polymer-based composite materials with anti-icing function to solve the problems of high cost, many steps and unstable performance in the preparation of composite materials with anti-icing function in the current technology

Method used

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  • Control method of liquid drop bounce direction based on surface wetting gradient
  • Control method of liquid drop bounce direction based on surface wetting gradient
  • Control method of liquid drop bounce direction based on surface wetting gradient

Examples

Experimental program
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Effect test

Embodiment 1

[0032] A control method for controlling the bouncing direction of a droplet based on a surface wetting gradient, comprising the following steps:

[0033] (1) with Ti 6 al 4 V titanium alloy is the base material, and the base material is processed into a sample block with a size of 50mm×10mm×1mm by wire cutting, and then the surface of the sample block is polished with 0~5# metallographic sandpaper until there is no scratch on the naked eye, and then mechanically Polish until there are no scratches under metallographic microscope observation, then use acetone, alcohol and distilled water to ultrasonically clean for 10 minutes, dry to obtain the pretreated sample block, and store it in alcohol for later use;

[0034] (2) Use the sandblasting method to construct the primary micron-scale concave-convex structure. The specific process parameters of the sandblasting method are pressure 0.5MPa and sandblasting time 10s; after that, the sample block processed by the sandblasting meth...

Embodiment 2

[0038] A control method for controlling the bouncing direction of a droplet based on a surface wetting gradient, comprising the following steps:

[0039] (1) with Ti 6 al4 V titanium alloy is the base material, and the base material is processed into a sample block with a size of 60mm×10mm×1mm by wire cutting, and then the surface of the sample block is polished with 0~5# metallographic sandpaper until no scratches are observed with the naked eye, and then mechanically polished Until no scratches are observed under the metallographic microscope, then use acetone, alcohol and distilled water to ultrasonically clean for 10 minutes, and dry to obtain the pretreated sample block, which is stored in alcohol for later use;

[0040] (2) Use the sandblasting method to construct the primary micron-scale concave-convex structure. The specific process parameters of the sandblasting method are pressure 0.5MPa and sandblasting time 10s; after that, the sample block processed by the sandbla...

Embodiment 3

[0044] A control method for controlling the bouncing direction of a droplet based on a surface wetting gradient, comprising the following steps:

[0045] (1) Using aluminum alloy as the base metal, use wire cutting to process the base material into a sample block with a size of 100mm×20mm×1mm, and then use 0~5# metallographic sandpaper to polish the surface of the sample block until no scratches are observed with the naked eye, and then Perform mechanical polishing until no scratches are observed under the metallographic microscope, then use acetone, alcohol and distilled water to ultrasonically clean for 10 minutes, and dry to obtain the pretreated sample block, which is stored in alcohol for later use;

[0046] (2) Use the sandblasting method to construct the primary micron-scale concave-convex structure. The specific process parameters of the sandblasting method are pressure 0.5MPa and sandblasting time 10s; after that, the sample block processed by the sandblasting method i...

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Abstract

The invention provides a control method of a liquid drop bounce direction based on a surface wetting gradient. A surface free energy gradient is established on the surface with a uniform structure, and thus, liquid drops are controlled to bounce to an area with low non-wettability from an area with high non-wettability. The control method of the liquid drop bounce direction based on the surface wetting gradient has the following advantages that the operation is simple and convenient, no exact requirement is on base body materials, and the cost is low; contact bouncing time of surface dynamic impacting liquid drops in a liquid drop impacting experiment is shortened to 11.6ms; the liquid drops can directionally bounce to the area with the low non-wettability from the area with the high non-wettability, and rapidly leave the surface of a finished product; and the wetting gradient surface of the prepared controllable impacting liquid drop bounce direction has important practical significance to industrial application of the super-hydrophobic surface.

Description

technical field [0001] The invention belongs to the technical field of metal material surface treatment, and in particular relates to a method for controlling the bouncing direction of a droplet based on a surface wetting gradient. Background technique [0002] The simulated superhydrophobic surface with an apparent contact angle greater than 150° and a rolling angle less than 10° has great application potential in the fields of waterproofing, self-cleaning, fluid drag reduction, anti-icing and anti-corrosion, and has been favored by researchers in recent years. Pay attention to. Among them, the contact behavior between the impacting droplet on the material surface and the solid surface, including contact time, energy conversion during bouncing, etc., is considered to be extremely important, which directly determines the heat between solid-liquid under practical application conditions. and the degree of energy conversion. [0003] In recent years, on the basis of reducing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/26C23C26/00C25D11/16C25D11/18B81C1/00B82Y40/00
Inventor 陶杰沈一洲卢阳江家威吴正维
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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