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Soakage controllable zinc oxide single crystal surface modification method

A zinc oxide single crystal, surface modification technology, applied in chemical instruments and methods, crystal growth, diffusion/doping, etc., can solve problems such as poor stability of organic matter, complex preparation methods, limited application, etc., to achieve stable performance and operation. Simple process, fully utilized effect

Active Publication Date: 2013-06-05
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The array is mainly by changing the chemical composition of the array surface, such as by controlling the density of the zinc oxide nanorod array, but the preparation method is relatively complicated and takes a long time
The other is chemical modification, such as fatty acid modification with different carbon chain lengths, but the stability of organic matter is relatively poor, and ultraviolet light irradiation can cause organic matter to decompose
Therefore, the application of these methods is limited

Method used

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  • Soakage controllable zinc oxide single crystal surface modification method
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  • Soakage controllable zinc oxide single crystal surface modification method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] After the He-Ne laser is collimated, place the thermal paper on the workbench and determine the proper workbench position. The measured spot area is 1.45×0.6=0.87cm 2 , to calculate the required energy. The sample is placed on the sample stage, the laser pulse frequency is set to 3 Hz, and the number of pulses is 1800. Irradiated at different energy densities, the energy density is 100mJ / cm 2 、200mJ / cm 2 、300mJ / cm 2 、400mJ / cm 2 、500mJ / cm 2 、600mJ / cm 2 , 700mJ / cm 2 , 800mJ / cm 2 The modified sample surface was measured by OCA video optical contact angle measuring instrument. See the experimental results figure 1 , the results show that when the laser energy density is 200-600mJ / cm 2 It is a better preparation range, and the energy exceeds 600mJ / cm 2 The post-irradiated surface is less uniform.

[0027] The above-mentioned irradiated energy density is 300mJ / cm 2 Put the sample after laser irradiation with a frequency of 3Hz and a pulse number of 1800 into the ...

Embodiment 2

[0029] After the He-Ne laser is collimated, place the thermal paper on the workbench and determine the proper workbench position. The measured spot area is 1.45×0.6=0.87cm 2 , set the output energy to 174mJ, that is, the energy density is 200mJ / cm 2 . The sample is placed on the sample stage, the laser pulse frequency is set to 3Hz, and the laser is turned on for irradiation under different pulse numbers, respectively 0, 50, 100, 200, 300, 400, 500, 600, 900, 1200, 1800 The surfaces of the modified samples were measured by OCA video optical contact angle measuring instrument. See the experimental results figure 2 , the results show that when the number of pulses reaches 50, the surface turns into a hydrophobic surface, and the highest hydrophobic angle is 121°.

[0030] The above irradiated energy density is 200mJ / cm 2 Put the sample after laser irradiation with a frequency of 3 Hz and a pulse number of 1800 into the crucible, push it into the center of the annealing furn...

Embodiment 3

[0032] After the He-Ne laser is collimated, place the thermal paper on the workbench and determine the proper workbench position. The measured spot area is 1.45×0.6=0.87cm 2 , set the output energy to 174mJ, that is, the energy density is 200mJ / cm 2 . The sample is placed on the sample stage, the number of laser pulses is set to 900, and the laser is turned on at different frequencies for irradiation, respectively 1, 3, and 10. The surface of the modified sample is measured by an OCA video optical contact angle measuring instrument . The experimental results are shown in Table 1. If the pulse frequency is too high, the prepared surface will be uneven. If the pulse frequency is too low, the surface prepared will have poor hydrophobicity. The general frequency is preferably 3-5 Hz.

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Abstract

The invention relates to a soakage controllable zinc oxide single crystal surface modification method, belonging to the technical field of zinc oxides. The modification method comprises the followings: 1, laser irradiation and hydrophobization: determining an irradiation position and making the laser energy density be 200-600mJ / cm <2> and the laser frequency be 3-5Hz, selecting a zinc oxide single crystal smaller than a light spot, and placing the zinc oxide single crystal in the light spot region to carry out the laser irradiation, wherein the pulse number of the laser is at least 50; and 2,annealing and hydrophilization processing: cleaning and drying surface-hydrophobization zinc oxide single crystal, and then placing into a crucible, pushing into a vacuum cavity of an annealing furnace, closing a gas value after introducing oxygen of 0.5Mpa into the furnace, carrying out the annealing process, and firstly heating up for 3-8 hours at a temperature rise speed of 100 DEG C / h and then carrying out heat preservation for 1h, and finally cooling to the room temperature at a cooling speed of 100 DEG C / h. The soakage controllable zinc oxide single crystal surface modification method can be applied to the fields of transportation of intelligent micro fluids and controllable drugs, self-cleaning of surfaces and the like; in addition, the full utilization of zinc oxides is realized and resources are saved.

Description

technical field [0001] The invention belongs to the technical field of zinc oxide, in particular to a method for modifying the surface of zinc oxide, in particular to a method for modifying the surface of a zinc oxide single crystal with controllable wettability. Background technique [0002] Wettability is one of the very important properties of solid surfaces. It is widely used in daily life and industrial and agricultural production. For a solid surface, a contact angle of less than 90° is a hydrophilic surface, and a contact angle greater than 90° is a hydrophobic surface. In recent years, more and more attention has been paid to controlling the wettability of solid surfaces, which mainly depends on two factors: surface free energy and surface roughness. In 1997, researchers published an article in Nature, first reporting that the wettability of titanium dioxide changed to a super-hydrophilic surface after ultraviolet irradiation, which can realize self-cleaning and an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B31/20C30B33/02
Inventor 蒋毅坚谢思静赵艳
Owner BEIJING UNIV OF TECH