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A porous film with vertical through channels, its manufacturing device and preparation method

A technology of porous film and through-hole channel, which is applied to chemical instruments and methods, devices for coating liquid on the surface, nickel compounds, etc., and can solve the problem that the minimum thickness cannot be less than 0.8 mm, vertical channels cannot be obtained, porous membrane is easily broken, etc. problems, to achieve the effect of facilitating the diffusion of substances, increasing the effective catalytic area, and the method is simple

Active Publication Date: 2021-06-01
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The spin-coating method cannot obtain pores perpendicular to the membrane surface, and the freezing method can obtain porous membranes with vertical wedge-shaped channels, but the thickness of the porous membrane is generally on the order of millimeters, and the minimum thickness cannot be less than 0.8 mm
If the thickness is controlled below 0.8 mm by grinding, the porous membrane will be easily broken and most of the materials will be wasted

Method used

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  • A porous film with vertical through channels, its manufacturing device and preparation method
  • A porous film with vertical through channels, its manufacturing device and preparation method
  • A porous film with vertical through channels, its manufacturing device and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] (1) Take a suspension of 8 mg / ml graphene oxide in water and ethanol and mix it uniformly with a volume ratio of 30:1, and ultrasonicate for 10 minutes to obtain a solid-liquid mixture;

[0066] (2) use figure 1 The device uses ethanol as a refrigerant, turns on the freezing device to cool the ethanol to -60°C, turns on the rotating device and sets the rotation speed to 2600r / min, and waits for 15 minutes for the device to have a uniform temperature and stable operation;

[0067] (3) Take 350 microliters of the solid-liquid mixture obtained in step (1) and put it into the injector, and use the injector to inject the solid-liquid mixture into a device with stable operation. The solid-liquid mixture spreads rapidly at the bottom of the spin coating pool and cools Freeze, wait for 1 minute to obtain a crystalline film;

[0068] (4) Put the crystalline film obtained in step (3) into a freeze dryer at -60°C for 48 hours and freeze-dry for 48 hours. After sublimation of the ...

Embodiment 2

[0070] (1) Get the suspension of 5ml 0.5mg / ml graphene oxide in water and the potassium chloroplatinate of 0.5ml 0.01mol / L in ice-water bath and stir reaction 30min, obtain the graphene oxide solid-liquid mixture that is loaded with platinum, Graphene oxide solid powder loaded with platinum was obtained after freeze-drying, that is, Pt / GO;

[0071] (2) Use the platinum-loaded graphene oxide obtained in step (1) and water to prepare 8 mg / ml platinum-loaded graphene oxide suspension, and mix it with 1wt% polytetrafluoroethylene solution at a volume ratio of 1:1 , sonicate for 10 minutes to obtain a solid-liquid mixture;

[0072] (3) use figure 1 The device uses ethanol as a refrigerant, turns on the freezing device to cool the ethanol to -60°C, turns on the rotating device and sets the rotation speed to 2000r / min, and waits for 15 minutes for the device to have a uniform temperature and stable operation;

[0073] (4) Take 350 microliters of the solid-liquid mixture obtained in...

Embodiment 3

[0076] (1) Get 0.873g nickel nitrate hexahydrate and 0.404g ferric nitrate nonahydrate to be dissolved in 40ml water to make saline solution, 0.48g sodium hydroxide and 0.088g sodium hypophosphite to be dissolved in 40ml water to make alkali solution, salt solution and Alkaline solution is double-dropped in 80ml 0.94mg / ml graphene suspension under the condition of nitrogen gas, the pH value of the solution is maintained at about 8.5, stirred for 12 hours, centrifuged and washed, and the nickel-iron composite hydroxide grown on the graphene is obtained colloid;

[0077] (2) The dispersion liquid of the nickel-iron composite hydroxide colloid grown on the graphene obtained in step (1) of about 8mg / ml is mixed with the 1wt% polytetrafluoroethylene solution with a volume ratio of 1:1, and ultrasonic 10 minutes to obtain a solid-liquid mixture;

[0078] (3) use figure 1 The device uses ethanol as a refrigerant, turns on the freezing device to cool the ethanol to -60°C, turns on t...

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Abstract

The invention relates to the technical field of spin coating, and discloses a porous film with vertical through holes, a manufacturing device and a preparation method thereof. The thickness of the porous film is 5-800 microns, and there are vertical through-holes perpendicular to the surface of the film inside. The preparation device of the porous film is a spin-coating freezer, which includes a freezer (7) and a spin-coating tank (3), wherein the freezer (7) is configured to cool the spin-coater (3), The spin coating pool (3) has a rotation axis (1), and the spin coating pool (3) also has a material inlet (6). The invention also discloses a method for preparing a porous film by utilizing the spin-coating freezing device. The method is simple to operate, and the film thickness is uniform and continuous, and can be used for large-scale preparation of porous films with wedge-shaped channels.

Description

technical field [0001] The invention relates to the technical field of spin coating, in particular to a porous film with vertical through holes, a manufacturing device and a preparation method thereof. Background technique [0002] Nano-microporous membranes have the advantages of large specific surface area, low density, and high porosity, and are widely used in the fields of electrochemistry and photocatalysis. However, in some chemical reactions, such as gas-involved electrochemical reactions, the disordered arrangement and stacking of nano-microstructures will cause problems such as poor gas transmission and low catalyst utilization efficiency. Therefore, it is expected that the design of vertically arranged nano-microporous membranes can not only increase the effective catalytic area, but also obtain smooth and coherent gas transport channels and reduce the bubble transport resistance. At present, there are many methods for manufacturing nano-micro porous membranes, su...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/198C01G53/00B05D7/24B05D3/00
CPCB05D3/007B05D7/24C01G53/00C01P2004/03C01P2004/80C01B32/198
Inventor 孙晓明成聪田罗马孙恺黄仪珺刘文邝允
Owner BEIJING UNIV OF CHEM TECH
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