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A functional nanofiber three-dimensional network flexible sensing film and its preparation method and application

A technology of sensing film and three-dimensional mesh, which is applied in chemical instruments and methods, separation methods, fiber processing, etc., can solve the problems of incompatibility between air flow and filtration efficiency, inability to meet high-efficiency filtration of PM, and bulky filters. Achieve the effects of novel network structure, enhanced interconnectivity, and simple process

Active Publication Date: 2021-01-12
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of the second type of filter is that it is bulky, opaque, and the air flow and filtration efficiency cannot be combined, which cannot meet the requirements of high-efficiency filtration of PM 2.5

Method used

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  • A functional nanofiber three-dimensional network flexible sensing film and its preparation method and application
  • A functional nanofiber three-dimensional network flexible sensing film and its preparation method and application
  • A functional nanofiber three-dimensional network flexible sensing film and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] 1a: First, dissolve 1 g of polyacrylonitrile (PAN) in a mixture of 7 mL of N,N-dimethylformamide (DMF) and 3 mL of acetone, wherein the concentration of polyacrylonitrile is 10% (mass fraction), and magnetically stir After 6-8 hours, it will become viscous and transparent; fill the syringe and place the syringe on the pusher to fix it. The receivers are screens of different thicknesses, and the base is aluminum foil. Connect the positive and negative poles of the high voltage to the syringe needle and the aluminum foil respectively to form an electric field. The resulting electric field can be made into nanofibers by passing the polymer solution through the syringe. Adjust the distance between the needle tip of the syringe and the collection device to 15cm, set the voltage between the emission device and the collection device to 20kV, adjust the output speed of the syringe pump to 0.5mL / h, and electrospin for 15min, 30min, 1h to obtain nanofiber films Wrapped mesh scr...

Embodiment 2

[0054] 2a: Refer to step 1a in Example 1 to prepare a three-dimensional network skeleton of polyacrylonitrile nanofibers.

[0055] 2b: Refer to step 1b in Example 1, wherein dimethyl yellow is replaced by chromotropic acid, and other steps are the same to prepare a mixed function solution.

[0056] 2c: See 1c in Example 1.

[0057] 2d: Refer to 1d in Example 1 to obtain a polyacrylonitrile nanofiber film.

[0058] The polyacrylonitrile nanofibers prepared in the above examples are arranged randomly on the mesh screen window, and the functional solutions of hydroxylamine sulfate and chromotropic acid are evenly wrapped on the surface of the polyacrylonitrile nanofibers with the three-dimensional network skeleton.

[0059] The polyacrylonitrile nanofiber film prepared in Example 2 was assembled on a gas sensing device for formaldehyde gas detection.

[0060] Performance testing: the prepared polyacrylonitrile nanofiber film was cut into 4cm×4cm and placed in a sealed cover (sa...

Embodiment 3

[0065] 3a: Prepare a 15wt% polyvinylpyrrolidone (PVP) ethanol solution, refer to the method of 1a in Example 1, and electrospin for 1 hour to prepare a polyvinylpyrrolidone three-dimensional network skeleton.

[0066] 3b: Dissolve 0.1 g of zinc tetraphenylporphyrin in 50 mL of chloroform solution, stir and dissolve to prepare a functional solution.

[0067] 3c: Cut the prepared three-dimensional network skeleton into a size of 5 cm × 5 cm, then soak it in the mixed functional solution prepared in 3b for 15 seconds, take it out and immerse it again, and repeat this three times.

[0068] 3d: The functionalized film is taken out and dried in a vacuum oven to obtain a polyvinylpyrrolidone nanofiber film.

[0069] The polyvinylpyrrolidone nanofibers prepared in the above example are arranged randomly on the mesh screen window, and the zinc tetraphenylporphyrin functional solution is evenly wrapped on the surface of the polyvinylpyrrolidone nanofibers with the three-dimensional netw...

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Abstract

The invention discloses a preparation method of a functionalized nanofiber three-dimensional net-shaped flexible sensing film. The preparation method includes the steps that a, a three-dimensional net-shaped framework is prepared by an electrospinning polymer material; b, a functionalized solution is prepared; and c, the functionalized solution is uniformly loaded on the surface of the net-shapedframework, and the three-dimensional netshaped flexible sensing film is obtained by drying. The obtained functionalized nanofiber three-dimensional net-shaped flexible sensing film can show visible color changes when being in contact with harmful gases such as formaldehyde, ethanol, acetone and benzene, and has low detection limit, high selectivity, filtration efficiency and light transmittance; and room temperature detection can be realized without additional conditions, environmentally friendly, and application prospects are great in the field of colorimetric sensors and PM2.5 air purification.

Description

technical field [0001] The invention belongs to the field of inorganic and organic composite technology, and specifically relates to a functionalized nanofiber three-dimensional network flexible sensing film and a preparation method thereof, and the sensing film can be used in formaldehyde, ethanol, acetone, benzene, acetaldehyde, methanol, The application of ammonia, triethylamine and other gas color change sensing and PM 2.5 filtration in the air. Background technique [0002] If people are exposed to volatile organic harmful gases such as formaldehyde and acetone for a long time, they will seriously affect their health. It is still an important challenge for us to develop efficient sensors for detecting volatile organic harmful gases. Currently effective sensing elements are complicated to process, prone to contamination, high cost and lack of portability, hindering the further development of sensing elements. [0003] In order to overcome these shortcomings, Suslick et ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D46/54G01N33/00D01F6/54D01F6/44D01F6/94D06M11/63D06M101/28D06M101/18D06M101/30
CPCB01D46/543D01F6/44D01F6/54D01F6/94D06M11/63D06M2101/18D06M2101/28D06M2101/30G01N33/0036G01N33/0047Y02A50/20
Inventor 万鹏博郑凯强钟梦娟吴晓璇
Owner BEIJING UNIV OF CHEM TECH
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