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Preparation method for modified carbon quantum dot/silicone rubber fluorescent composite material

A technology of carbon quantum dots and composite materials, which is applied in the field of preparation of modified carbon quantum dots/silicone rubber fluorescent composite materials, which can solve the problems of fluorescence quenching and fluorescence performance reduction, so as to prolong the service life, prevent precipitation and improve strength Effect

Active Publication Date: 2019-01-11
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, CQDs are prone to agglomeration, which will lead to fluorescence quenching, which will greatly reduce the fluorescence performance.

Method used

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  • Preparation method for modified carbon quantum dot/silicone rubber fluorescent composite material
  • Preparation method for modified carbon quantum dot/silicone rubber fluorescent composite material
  • Preparation method for modified carbon quantum dot/silicone rubber fluorescent composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Preparation of carbon quantum dots

[0030] Prepare 1mol / L water-soluble starch solution and 1mol / L NaOH solution, take 10mL each, mix evenly and ultrasonically treat for 10h, adjust the pH of the solution to neutral with HCl, add 100mL absolute ethanol drop by drop and stir, then add 16g Remove water with anhydrous magnesium sulfate, let it stand for 24 hours, take the supernatant and centrifuge at 10000r / min for 20 minutes at a high speed and filter with a 0.22μm filter membrane to remove macromolecular particles and non-luminescent substances, and obtain a pure ethanol solution of fluorescent carbon quantum dots. An infrared test was carried out on the obtained fluorescent carbon quantum dot ethanol solution, and the test results are shown in figure 1 In (a), by figure 1 In (a), it can be seen that the surface of the prepared carbon quantum dots contains functional groups such as -OH, C=O and -COOH.

[0031] (2) Preparation of modified carbon quantum dots

[0...

Embodiment 2

[0040] (1) Preparation of carbon quantum dots

[0041] Prepare 1mol / L water-soluble starch solution and 1mol / L NaOH solution, take 10mL each, mix them evenly, and then ultrasonically treat them for 8h, adjust the pH of the solution to neutral with HCl, add 100mL absolute ethanol drop by drop and stir, then add Remove water with 16g of anhydrous magnesium sulfate, let it stand for 24 hours, take the supernatant and centrifuge at 10,000r / min for 20 minutes at high speed and filter with a 0.22μm filter membrane to remove macromolecular particles and non-luminescent substances, and obtain a pure ethanol solution of fluorescent carbon quantum dots;

[0042] (2) Preparation of modified carbon quantum dots

[0043] Measure 25mL of ethanol solution of carbon quantum dots, 5mL of deionized water and 0.25mL of silane coupling agent KH570, react them in an ice-water bath for 30min, then raise the temperature to 50°C, and stir for 2h to obtain modified carbon quantum dot ethanol solution...

Embodiment 3

[0047] (1) Preparation of carbon quantum dots

[0048] Prepare 1mol / L water-soluble starch solution and 1mol / L NaOH solution, take 10mL each, mix them evenly, and then sonicate for 10h, adjust the pH of the solution to neutral with HCl, add 100mL absolute ethanol drop by drop and stir, then add Remove water with 16g of anhydrous magnesium sulfate, let it stand for 24 hours, take the supernatant and centrifuge at 10,000r / min for 20 minutes at high speed and filter with a 0.22μm filter membrane to remove macromolecular particles and non-luminescent substances, and obtain a pure ethanol solution of fluorescent carbon quantum dots;

[0049] (2) Preparation of modified carbon quantum dots

[0050] Measure 25mL of ethanol solution of carbon quantum dots, 5mL of deionized water and 0.75mL of silane coupling agent KH570, react them in an ice-water bath for 30min, then raise the temperature to 70°C, and stir for 1h to obtain modified carbon quantum dot ethanol solution;

[0051] (3) ...

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Abstract

The invention belongs to the field of nano composite materials, and in particular relates to a preparation method for a modified carbon quantum dot / silicone rubber fluorescent composite material. Thepreparation method comprises the following steps: (1) preparation of carbon quantum dots: preparing a carbon quantum dot ethanol solution by taking a water soluble starch solution as a carbon source;(2) preparation of modified carbon quantum dots: modifying the carbon quantum dots with a silane coupling agent KH570; and (3) preparation of the modified carbon quantum dot / silicone rubber fluorescent composite material: preparing the modified carbon quantum dot / silicone rubber fluorescent composite material from base rubber I, base rubber II, hydrogen-containing silicone oil, a solvent and the modified carbon quantum dot ethanol solution as raw materials. By modifying the carbon quantum dots with the silane coupling agent KH570 and introducing the silane coupling agent to the surfaces of thecarbon quantum dots, the carbon quantum dots take part in a vulcanization reaction of silicone rubber, so that the carbon quantum dots are uniformly dispersed in the silicone rubber to obtain the carbon quantum dot / silicone rubber fluorescent composite material with a good fluorescent effect, and therefore, the application of the silicone rubber in the fields with fluorescent demands is expanded.

Description

technical field [0001] The invention belongs to the field of nanocomposite materials, in particular to a method for preparing a modified carbon quantum dot / silicone rubber fluorescent composite material. Background technique [0002] Carbon quantum dots (CQDs) is an environmentally friendly fluorescent nanomaterial with similar optical properties to semiconductor quantum dots. In addition to the advantages of traditional semiconductor quantum dots such as small size and small size, they also have incomparable advantages such as good biocompatibility, easy large-scale synthesis and functional modification, low preparation cost, and mild reaction conditions. However, CQDs are prone to agglomeration, which will lead to fluorescence quenching, which will greatly reduce the fluorescence performance. [0003] Recent studies have shown that CQDs can be introduced into polymer matrices through rational design for multiple functional modifications, which can improve the photostabili...

Claims

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Application Information

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IPC IPC(8): C08L83/04C08L83/05C08K9/06C08K7/18
CPCC08L83/04C08L2205/02C08L2205/025C08L2205/03C08K9/06C08K7/18
Inventor 姜彦李建平季月羌慧钧张洪文张莹双
Owner CHANGZHOU UNIV
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