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Preparation and application of mesoporous silica/polyacrylonitrile core-shell nano-fiber films loaded with carbon quantum dots

A technology of mesoporous silica and nanofiber membrane, which is applied in measurement devices, fluorescence/phosphorescence, chemical instruments and methods, etc., can solve the problems of difficult separation and recovery of carbon quantum dot materials, and achieve good pH stability, preparation The method is simple, the effect of large application potential

Inactive Publication Date: 2016-06-29
XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It provides a new way to solve the difficult problem of separation and recovery of existing carbon quantum dot materials in many practical applications

Method used

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  • Preparation and application of mesoporous silica/polyacrylonitrile core-shell nano-fiber films loaded with carbon quantum dots
  • Preparation and application of mesoporous silica/polyacrylonitrile core-shell nano-fiber films loaded with carbon quantum dots
  • Preparation and application of mesoporous silica/polyacrylonitrile core-shell nano-fiber films loaded with carbon quantum dots

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A, the polyacrylonitrile nanofiber film that molecular weight is 50,000 is immersed in the ethanol that mass ratio is 1:0.2: Carry out ultrasonic in the mixed solution of water;

[0023] b. During ultrasonication, add cetyltrimethylammonium bromide, carbon quantum dot solution, ethyl tetrasilicate and ammonia water with a concentration of 27wt% to carry out sol-gel by mass ratio of 1:0.2:0.5:0.5 reaction to obtain a mesoporous silica / polyacrylonitrile nanofiber membrane mixture with carbon quantum dots immobilized on the outer surface;

[0024] c, the resulting mixture was stirred for 1 hour at room temperature to continue the sol-gel reaction;

[0025] d. The mixture in step c is refluxed and washed 3 times in ethanol-hydrochloric acid solution with a mass ratio of 1:0.05 to remove the mesoporous pore-forming agent to obtain mesoporous silica / polyacrylonitrile core-shell loaded with carbon quantum dots nanofibrous membrane.

Embodiment 2

[0027] A, the polyacrylonitrile nanofiber film that molecular weight is 100,000 is immersed in the ethanol that mass ratio is 1:1: carry out ultrasonic in the mixed solution of water;

[0028] b. During ultrasonication, add hexadecyltrimethylammonium bromide, carbon quantum dot solution, tetraethyl orthosilicate and ammonia water with a concentration of 27wt% in a mass ratio of 1:1:2:2 to carry out sol-gel reaction to obtain a mesoporous silica / polyacrylonitrile nanofiber membrane mixture with carbon quantum dots immobilized on the outer surface;

[0029] c, the obtained mixture was stirred for 6 hours at room temperature to continue the sol-gel reaction;

[0030] d. The mixture in step c is refluxed and washed 7 times in ethanol-hydrochloric acid solution with a mass ratio of 1:0.2 to remove the mesoporous pore-forming agent to obtain the mesoporous silica / polyacrylonitrile core-shell loaded with carbon quantum dots nanofibrous membrane.

Embodiment 3

[0032] A, the polyacrylonitrile nanofiber film that molecular weight is 150,000 is immersed in the ethanol that mass ratio is 1:0.5: carry out ultrasonic in the mixed solution of water;

[0033] b. During ultrasonication, add cetyltrimethylammonium bromide, carbon quantum dot solution, tetraethyl orthosilicate and ammonia water with a concentration of 27wt% at a mass ratio of 1:0.5:1:1 to carry out sol-gel reaction to obtain a mesoporous silica / polyacrylonitrile nanofiber membrane mixture with carbon quantum dots immobilized on the outer surface;

[0034] c, the obtained mixture was stirred for 3 hours at room temperature to continue the sol-gel reaction;

[0035] d. The mixture in step c is refluxed and washed 5 times in the ethanol-hydrochloric acid solution with a mass ratio of 1:0.05-0.2 to remove the mesoporous pore-forming agent CTAB to obtain mesoporous silica / polypropylene loaded with carbon quantum dots Nitrile core-shell nanofiber membrane.

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Abstract

The invention relates to preparation and application of mesoporous silica / polyacrylonitrile core-shell nano-fiber films loaded with carbon quantum dots. A method includes preparing mesoporous silica / polyacrylonitrile core-shell nano-fiber film materials loaded with the carbon quantum dots from polyacrylonitrile nano-fiber films, tetraethylortho silicate and the carbon quantum dots by the aid of a sol-gel process. The preparation and the application have the advantages that mesoporous silica / polyacrylonitrile core-shell nano-fiber film materials can be applied to selective fluorescence detection on Fe3+ in water, are good in pH (potential of hydrogen) stability and high in photo-bleaching resistance and are perfect sensitive materials applicable to preparing thin-film type sensing devices.

Description

technical field [0001] The invention relates to the preparation and application of a mesoporous silica / polyacrylonitrile core-shell nanofiber membrane loaded with carbon quantum dots, in particular to the preparation and application of carbon quantum dots on the mesoporous silica / polyacrylonitrile core-shell nanofiber membrane Immobilization method and application in fluorescence sensing detection. Background technique [0002] Carbon quantum dots (CDs) are considered to be the most promising photoluminescent (PL) Probe material. Based on the above advantages, scientists have synthesized many kinds of carbon quantum dots through pyrolysis, chemical oxidation, carbonization, hydrothermal method, ultrasonic microwave synthesis, etc., and are increasingly used as biomolecules, metal ions, Fluorescent sensing of substances such as explosives. On the other hand, fluorescent carbon quantum dots are small in size and difficult to separate. Considering the problems of separation ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65C09K11/02G01N21/64
CPCC09K11/025C09K11/65G01N21/643
Inventor 李守柱袁群惠周生海
Owner XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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