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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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, CQDs are prone to agglomeration, which will lead to fluoresce

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

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[0028] Example 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 well and sonicate for 10h, adjust the pH of the solution to neutral with HCl, add 100mL absolute ethanol dropwise and stir, then add 16g Anhydrous magnesium sulfate to remove water, let it stand for 24h, take the supernatant liquid at 10000r / min high speed centrifugation for 20min and filter it with 0.22μm filter membrane to remove macromolecular particles and non-luminescent substances, and obtain pure fluorescent carbon quantum dot ethanol solution. Perform infrared test on the obtained fluorescent carbon quantum dot ethanol solution, and see the test results 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

[0032] Measure 25mL carbon quantum dot ethano...

Example Embodiment

[0039] Example 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 uniformly and ultrasonicate for 8h, adjust the pH of the solution to neutral with HCl, add 100mL absolute ethanol dropwise and stir, then add 16g of anhydrous magnesium sulfate to remove water, let it stand for 24 hours, take the supernatant liquid at 10000r / min high speed centrifugation for 20min and filter with 0.22μm filter membrane to remove macromolecular particles and non-luminescent substances to obtain pure fluorescent carbon quantum dot ethanol solution;

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

[0043] Measure 25mL carbon quantum dot ethanol solution, 5mL deionized water and 0.25mL silane coupling agent KH570, react for 30min under ice-water bath, then heat to 50℃, stir and react for 2h to obtain modified carbon quantum dot ethanol Solution

[0044] (3) Preparation of carbon quantum dot / silic...

Example Embodiment

[0046] Example 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 uniformly, and ultrasonic treatment for 10h, adjust the pH of the solution to neutral with HCl, add 100mL absolute ethanol dropwise and stir, then add 16g of anhydrous magnesium sulfate to remove water, let it stand for 24 hours, take the supernatant liquid at 10000r / min high speed centrifugation for 20min and filter with 0.22μm filter membrane to remove macromolecular particles and non-luminescent substances to obtain pure fluorescent carbon quantum dot ethanol solution;

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

[0050] Measure 25mL carbon quantum dot ethanol solution, 5mL deionized water and 0.75mL silane coupling agent KH570, react for 30min under ice-water bath, then heat to 70℃, stir and react for 1h to obtain modified carbon quantum dot ethanol Solution

[0051] (3) Preparation of carbon quantum ...

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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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