Implementation method for persistent super-hydrophilicity of sapphire surface

A realization method, sapphire technology, applied in the field of laser processing to prepare super-hydrophilic materials, to achieve the effect of wide application range and long-lasting super-hydrophilic performance

Active Publication Date: 2022-03-01
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, no research has found how to further reduce the contact angle of the material surface and maintain the superhydrophilic performance for a long time.

Method used

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  • Implementation method for persistent super-hydrophilicity of sapphire surface
  • Implementation method for persistent super-hydrophilicity of sapphire surface
  • Implementation method for persistent super-hydrophilicity of sapphire surface

Examples

Experimental program
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Effect test

Embodiment 1

[0047] The realization method of the sapphire surface durable superhydrophilicity provided by the embodiment of the present invention 1 comprises the following steps:

[0048] S0, putting the sapphire into an ethanol solution for ultrasonic cleaning.

[0049] S1. A femtosecond laser is used to ablate the surface of sapphire to form a periodic micron-scale groove structure on the surface of sapphire and simultaneously generate hydrophilic γ-phase alumina.

[0050] After cleaning the sapphire, use an optical lens with a focal length of 100mm to focus and irradiate the femtosecond laser on the sapphire surface, and ablate at equal intervals with a space period of 35 μm to form a micron-scale groove structure.

[0051] When the laser power of the femtosecond laser is 200mW and the scanning speed is 0.1mm / s, the depth of the micron-scale groove structure is 92.31μm, and the opening width is 32.44μm. The surface morphology is as follows: figure 2 In (a) shown.

[0052] S2. Spin-c...

Embodiment 2

[0061] The difference between embodiment 2 and embodiment 1 is that the scanning speed of the femtosecond laser is 0.3 mm / s, the depth of the formed micron-scale groove structure is 30.77 μm, and the opening width is 34.15 μm, such as figure 2 Shown in (b) among, other steps are identical with embodiment 1.

[0062] After high-temperature annealing, the anatase titanium dioxide crystal coating partially fills the micron-scale groove structure, such as image 3 As shown in (b), the surface morphology of the anatase titanium dioxide crystal coating formed in Example 1 is different.

[0063] At this time, the contact angle of the sapphire surface was measured to be 0°, and the super-hydrophilic state could be maintained for 60 days. After 60 days, the contact angle began to increase gradually. The results are as follows Figure 4 In (b) shown.

Embodiment 3

[0065] The difference between embodiment 3 and embodiment 2 is that the scanning speed of the femtosecond laser is 0.5 mm / s, the depth of the formed micron-scale groove structure is 28.26 μm, and the opening width is 34.49 μm, such as figure 2 Shown in (c), other steps are identical with embodiment 2.

[0066] After high-temperature annealing, the anatase titanium dioxide crystal coating is basically filled into the micron-scale groove structure, such as image 3 As shown in (c), the anatase-type titanium dioxide crystal coating formed in Example 2 is partially filled in the micron-scale groove structure, so it can be seen that the anatase-type titanium dioxide formed in Example 3 and Example 2 The surface morphology of the crystal coating is different.

[0067] At this time, the contact angle of the sapphire surface was measured to be 0°, and the superhydrophilic state could be maintained for 27 days. After 27 days, the contact angle began to increase gradually. The results...

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Abstract

The invention provides a method for realizing persistent super-hydrophilicity of a sapphire surface, which comprises the following steps of: S1, ablating the sapphire surface by femtosecond laser to form a periodic micron-sized notch groove structure on the sapphire surface and generate hydrophilic gamma-phase aluminum oxide at the same time; s2, spin-coating a titanium dioxide precursor solution on the sapphire surface of the formed micron-sized notch groove structure and the gamma-phase aluminum oxide; and S3, after the titanium dioxide precursor solution is dried, putting the sapphire into a muffle furnace, and carrying out high-temperature annealing, so that the lasting super-hydrophilicity of the surface of the sapphire is realized. The femtosecond laser is combined with the anatase type titanium dioxide crystal coating, the contact angle between the sapphire surface and water can be 0 degree, and the contact angle can be kept for more than 180 days in the super-hydrophilic state.

Description

technical field [0001] The invention relates to the technical field of preparing superhydrophilic materials by laser processing, in particular to a method for realizing durable superhydrophilicity on a sapphire surface. Background technique [0002] The surface of sapphire material with superhydrophilic properties has functions such as self-cleaning and anti-fog. Improved anti-fog function. At present, although the biomimetic micro-nanostructure prepared by laser on the surface of sapphire material can form a super-hydrophilic surface with a contact angle of 0°, and this method is flexible in operation, its super-hydrophilic performance usually only appears in a short period of time. It is difficult to obtain long-term maintenance and continuation. Therefore, how to achieve long-term maintenance of laser-processed super-hydrophilic surfaces is a key problem to be solved in this field. [0003] In order to improve the persistence of superhydrophilicity on the surface of ma...

Claims

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Application Information

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IPC IPC(8): C04B41/00C04B41/50
CPCC04B41/0036C04B41/50C04B41/4535
Inventor 杨建军闫丹丹邹婷婷
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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