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Preparation method of composite structure film with unidirectional fog collection function and application thereof

A composite structure and fog collection technology, applied in the field of chemical bionics, can solve problems such as unsatisfactory needs, complex preparation process, and low water collection efficiency, and achieve increased collision probability and collection speed, strong operability, and good outdoor stability Effect

Active Publication Date: 2019-03-08
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the defects of the existing one-dimensional materials and two-dimensional materials that the water collection efficiency is not high, cannot meet the water needs of the vast water shortage areas, the preparation process is complicated and the cost is high, the present invention proposes a composite structure membrane with one-way fog collection function The preparation method and its application can efficiently collect tiny water droplets in the air to turn them into fresh water, and can realize the unidirectional transport of droplets from the hydrophobic side to the hydrophilic side

Method used

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  • Preparation method of composite structure film with unidirectional fog collection function and application thereof
  • Preparation method of composite structure film with unidirectional fog collection function and application thereof
  • Preparation method of composite structure film with unidirectional fog collection function and application thereof

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preparation example Construction

[0033] A kind of preparation method of the composite structure film with one-way fog collection function that the present invention proposes, such as figure 1 As shown, it specifically includes the following steps:

[0034] Step 1: Cleaning of copper mesh:

[0035] Put the copper mesh into ethanol, acetone and deionized water in turn, and ultrasonically clean them for 30 minutes respectively to remove the oil stains and impurities attached to the copper mesh. The aperture size of the selected copper mesh is about 72 μm, and the diameter of the copper wire is about 50 μm.

[0036] Step 2: Prepare a polymer solution with a mass fraction of 10-20%, and a potassium hydroxide solution with a concentration of 1.0-3.0mol / L:

[0037] Adding the polymer to the solvent and stirring for more than 5 hours to obtain a polymer solution with a mass fraction of 10-20%; adding potassium hydroxide particles to deionized water to obtain a potassium hydroxide solution with a concentration of 1....

Embodiment 1

[0050] Step 1: Cleaning of copper mesh:

[0051] Cut the copper mesh into a shape of 7cm×10cm, put it into ethanol, acetone, and deionized water in turn, and ultrasonically clean it for 30 minutes respectively to remove oil stains and impurities attached to the copper mesh.

[0052] Step 2: Prepare a polymer solution with a mass fraction of 10%, and a potassium hydroxide solution with a concentration of 1.0mol / L:

[0053] Put 10 parts by weight of polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP) into 90 parts by weight of a solvent, and stir for 8 hours to turn it into a polymer solution. The solvent components and mass ratio are acetone (Ac):N,N-dimethylacetamide (DMAc)=9:4, and polyvinylidene fluoride-hexafluoropropylene (PVDF- HFP) solution.

[0054] Put solid potassium hydroxide into deionized water to prepare a 1.0 mol / L potassium hydroxide aqueous solution.

[0055] Step 3: Spinning, covering a layer of polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP) fibe...

Embodiment 2

[0061] Step 1: Cleaning of copper mesh:

[0062] Cut the copper mesh into a shape of 7cm×10cm, put it into ethanol, acetone and deionized water in turn, and ultrasonically clean it for 30min respectively. Remove oil stains and impurities attached to the copper mesh.

[0063] Step 2: prepare a polymer solution with a mass fraction of 16%, and a concentration of 2.0mol / L potassium hydroxide solution:

[0064] 16 parts by weight of polytetrafluoroethylene (PTFE) was dissolved in 84 parts by weight of tetrahydrofuran (THF), and stirred for 8 hours to become a polytetrafluoroethylene (PTFE) solution. Put the solid potassium hydroxide into deionized water to prepare a 2.0 mol / L potassium hydroxide aqueous solution.

[0065] Step 3: Spinning, covering a layer of polytetrafluoroethylene (PTFE) fiber membrane on the cleaned copper grid by electrospinning method:

[0066] Paste the cleaned copper net on the center of the roller as the receiving substrate, place the polytetrafluoroeth...

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Abstract

The invention discloses a preparation method of a composite structure film with a unidirectional fog collection function and application thereof, and belongs to the technical field of chemobionics. The preparation method of the composite structure film with the unidirectional fog collection function includes the steps that firstly, a copper grid is washed, a polymer solution and a potassium hydroxide solution are prepared, then, the polymer solution is subjected to electrospinning on the copper grid, finally, electrochemical oxidation is conducted, the copper grid is oxidized into copper hydroxide, copper hydroxide nanoneedles cover the surface of the copper grid, and the nanoneedles penetrate through pores among polymer fibrous membranes. Copper hydroxide is hydrophilic, and the polymer fibrous membranes are hydrophobic. Frog is in contact with the nanoneedles and then is transmitted to hydrophilic sides, or the frog is in contact with the polymer fibrous membranes, aggregates and grows up to be in contact with the nanoneedles and then is transmitted to the hydrophilic sides, and water films are formed. When in contact with the water films, the polymer fibrous membranes or the nanoneedles, frog drops are still transmitted from the hydrophobic sides to the hydrophilic sides, and the water collection efficiency is greatly improved. The preparation method of the composite structure film with the unidirectional fog collection function is simple and easy to operate, and the prepared composite structure film is stable in character, high in water collection efficiency and wide inapplication range.

Description

technical field [0001] The invention belongs to the technical field of chemical bionics, and in particular relates to a preparation method and application of a composite structure membrane with a one-way fog collecting function. Background technique [0002] In the past few decades, due to the continuous advancement of social and technological life, the shortage of fresh water has become a potential crisis that threatens the sustainable development of human society. In its most recent Annual Risks Report, the World Economic Forum listed water crises as the most potentially impactful global risk. Two-thirds of the world's land is suffering from water scarcity, especially in semi-arid and desert regions (Reference 1: M.M. Mekonnen, A.Y. Hoekstra, Sci Adv 2016, 2.). At the same time, people in coastal areas also face the problem of scarcity of fresh water resources, and have to spend a lot of energy to desalinate sea water. The lack of clean and safe drinking water seriously ...

Claims

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Application Information

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IPC IPC(8): E03B3/28D01F6/32D01F6/70
CPCD01F6/32D01F6/70E03B3/28
Inventor 赵勇王女胡荣俊
Owner BEIHANG UNIV
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