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Method for preparing hydrophobic micro-structure on surface of organic glass through femtosecond laser

A technology of plexiglass and femtosecond laser, which is applied in the manufacture of microstructure devices, microstructure technology, microstructure devices, etc., can solve the problems of difficulty in obtaining hydrophobic surfaces and long time consumption, and achieve low material cost, high preparation efficiency, The effect of simple process

Inactive Publication Date: 2012-02-01
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this chemical etching method takes a long time and it is difficult to obtain a uniform hydrophobic surface

Method used

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  • Method for preparing hydrophobic micro-structure on surface of organic glass through femtosecond laser
  • Method for preparing hydrophobic micro-structure on surface of organic glass through femtosecond laser
  • Method for preparing hydrophobic micro-structure on surface of organic glass through femtosecond laser

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The laser pulse parameters emitted by the femtosecond laser are as follows: the pulse width is 120 fs, the wavelength is 800 nm, the pulse frequency is 1 kHz, and the single pulse energy is 3 mJ. These pulses are focused on the plexiglass surface by a 20X (N.A=0.45) objective lens, and the spot diameter of the femtosecond laser is 10 μm. When the femtosecond laser irradiates the plexiglass, the material in the laser irradiated area will be ablated, resulting in obvious structural changes, so that a periodic microstructure can be formed on the surface of the plexiglass through laser scanning.

[0031] refer to figure 2 As shown, (a) is the photo of the static contact angle of water droplets on the plexiglass surface that has not been irradiated by femtosecond laser, and the value is 79.5°. This result shows that the plexiglass surface is hydrophilic at this time; The micro-optical photo of the microstructure obtained by the second laser line scanning method on the surf...

Embodiment 2

[0033] This example is basically the same as Example 1, except that periodic fringes are first obtained by a line scan with a line width of 30 μm and a spacing of 30 μm. After completion, the sample is rotated 90°, and the scan is repeated once with the parameters just now. , forming an orthogonal structure, the result is as follows image 3 shown. (a) is the photograph of the static contact angle of water droplets on the plexiglass surface that has not been irradiated by femtosecond laser, and the value is 81.0°; (b) is the micro-optics of the microstructure obtained by the femtosecond laser surface scanning method on the plexiglass surface Photos; (c) and (d) the contact angle measurement results of the microstructured surface in two mutually perpendicular directions, (c) 133.3° and (d) 126.6°. Directly written orthogonal microstructure domains exhibit very uniform hydrophobicity.

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Abstract

The invention relates to a method for preparing a hydrophobic micro-structure on the surface of organic glass through a femtosecond laser, and the main process is as follows: a light beam transmitted by the femtosecond laser is irradiated to the surface of the organic glass after being focused by a microscope objective, as a light spot after focusing is very small and the power density is very high, and an ablation region which is equivalent to the scale of the light spot can be formed in an irradiation region; and furthermore, three-dimensional precision control can be further performed on a platform for placing a sample through a computer program, so that the periodic micron dimension micro-structure can be generated on the organic glass surface by utilizing the laser processing technology. Through the detection by a contact angle tester, the micro-structure has a very obvious hydrophobic characteristic; and furthermore, the wetness degree of water drops on the surface is related to the period and the type of the micro-structure. The manufacturing process of the invention is simple, raw materials are low in cost, the parameter selectivity and the controllability are very high, and the hydrophobic micro-structures in different sizes and patterns can be prepared on the surface of the organic glass.

Description

technical field [0001] The invention relates to a method for preparing a hydrophobic microstructure on the surface of plexiglass with a femtosecond laser, and belongs to the technical field of microstructure surface design and preparation and laser microprocessing. Background technique [0002] The wettability of solid surfaces is a very important research topic because it has many practical applications in industrial and agricultural production and scientific research. A direct measure of wettability is the measurement of the static contact angle of a liquid on a solid surface. Generally, if the contact angle is less than 90°, we consider the surface to be hydrophilic; otherwise, if the contact angle is greater than 90°, then the contact angle is hydrophobic. Especially for the hydrophobicity of solid surfaces, its main application value is reflected in its anti-pollution and self-cleaning, because these two characteristics have a wide range of application prospects, such...

Claims

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Application Information

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IPC IPC(8): B81C1/00B23K26/40B23K26/402
Inventor 戴晔任勇卞华栋
Owner SHANGHAI UNIV
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