A graphene quantum dot material with high ultraviolet absorption characteristics and lipophilicity and preparation method thereof

A graphene quantum dot and external absorption technology, applied in the field of nanomaterials, can solve the problems of using more solvents, graphene quantum dot materials are difficult to dissolve non-polar solvents and polymer materials, and poor ultraviolet absorption characteristics, etc., to achieve The effect of increasing the degree of carbonization and increasing the temperature of carbonization reaction

Active Publication Date: 2020-08-28
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The object of the present invention is to overcome the problems existing in the prior art, provide a kind of graphene quantum dot material with high ultraviolet absorption characteristic and lipophilicity and preparation method thereof, to solve the graphene quantum dot material preparation process in the prior art using more Multi-solvent, the prepared graphene quantum dot material is difficult to dissolve in non-polar solvents and polymer materials, and the problem of poor ultraviolet absorption characteristics

Method used

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  • A graphene quantum dot material with high ultraviolet absorption characteristics and lipophilicity and preparation method thereof
  • A graphene quantum dot material with high ultraviolet absorption characteristics and lipophilicity and preparation method thereof
  • A graphene quantum dot material with high ultraviolet absorption characteristics and lipophilicity and preparation method thereof

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Effect test

Embodiment 1

[0043] Weigh 2.20g of acetyl trioctyl citrate, place it in a 20mL glass microwave reaction tube, and control the temperature of the reactant at 250°C for 10 minutes under 2.45GHz and 700W microwave irradiation conditions to obtain a brown-black viscous Graphene quantum dot products with ester edge groups. After the product was cooled to room temperature, 4 mL of ethanol was added to the microwave reaction tube, and the product was uniformly dispersed in ethanol by ultrasonication and stirring. Transfer the obtained graphene quantum dot ethanol solution to a 50mL centrifuge tube, add 20mL acetone therein, make the graphene quantum dot precipitate from the ethanol-acetone mixed solution, centrifuge and precipitate the product obtained, pour to remove the supernatant, and Add 4 mL of ethanol to the precipitate, and ultrasonically disperse the precipitate in ethanol again. The precipitate was washed by centrifugation repeatedly three times, and the solvent was removed by freeze-d...

Embodiment 2

[0045] Weigh 10.00g of tributyl citrate, place it in a 100mL round-bottomed flask, and use an electric heating mantle to react the reactant at 250°C for 40 minutes under the condition of reflux condensation to obtain brown-black viscous Group graphene quantum dot products. After the product is cooled to room temperature, add 20 mL of ethanol to the flask and stir to make the product evenly dispersed in ethanol; transfer the prepared graphene quantum dot ethanol solution to multiple centrifuge tubes, and add 5 times the volume of acetone to each centrifuge tube to make the graphite Precipitation of ene quantum dots; centrifugal separation and precipitation of the obtained product. The precipitate was washed by centrifugation repeatedly three times, and the solvent was removed by freeze-drying to obtain a purified graphene quantum dot product.

[0046] The high-resolution projection electron micrograph of the graphene quantum dot material that this embodiment makes is as follow...

Embodiment 3

[0053] Weigh 10.00g of acetyl tributyl citrate, place it in a 100mL round-bottomed flask, and use an electric heating mantle to react the reactant at 250°C for 40 minutes under the protection of a nitrogen atmosphere to obtain brown-black viscous graphene quantum dots product. After the product was cooled to room temperature, 20 mL of ethanol was added to the flask, and stirred to make the product evenly dispersed in ethanol. The prepared graphene quantum dot ethanol solution was transferred to multiple centrifuge tubes, and 5 times the volume of deionized water was added to each centrifuge tube to precipitate the graphene quantum dots. The resulting product was centrifuged and precipitated. The precipitate was washed by centrifugation repeatedly three times, and the solvent was removed by freeze-drying to obtain a purified graphene quantum dot product.

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Abstract

The invention discloses a graphene quantum dot material with high ultraviolet absorption characteristics and lipophilicity and a preparation method of the graphene quantum dot material. The preparation method prepares the graphene quantum dot material with the high ultraviolet absorption characteristics and the lipophilic characteristics by using an ester of a polycarboxylic acid molecule as a carbon source through heat carbonization; the ester of the polycarboxylic acid molecule used in the method is in a liquid state under normal temperature or heating conditions and has a high boiling point, by using the feature, uniform carbonization of the carbon source can be realized through a simple heating manner without using any solvent, no special requirements for a heating atmosphere and carbonization pressure are needed in the solventless carbonization process, the carbonization efficiency is high, the environmental friendliness is realized, possible side reactions between the solvent andthe carbon source are prevented, the product separation and purification process is greatly simplified, and in the subsequent reaction process, a crude product can be purified only by dispersing andprecipitating treatment; and the prepared material has good lipophilicity and high ultraviolet absorption characteristics.

Description

【Technical field】 [0001] The invention belongs to the field of nanometer materials, in particular to a graphene quantum dot material with high ultraviolet absorption characteristics and lipophilicity and a preparation method thereof. 【Background technique】 [0002] Ultraviolet radiation exists in sunlight and various artificial light sources. Strong ultraviolet radiation can cause aging and damage to polymer materials, and also pose a threat to human health. Adding UV absorbers with high UV absorption properties to materials and coatings can effectively block UV radiation and reduce its negative effects. At present, organic small molecule ultraviolet absorbers and inorganic anti-ultraviolet radiation materials such as nano-zinc oxide and nano-titanium dioxide have been widely used, but there are still low light and thermal stability, and uneven dispersion in solvents, resins and polymer materials. lack of. In particular, the impact of existing UV absorbers on human health ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/184C09K11/65B82Y20/00B82Y40/00
CPCB82Y20/00B82Y40/00C01B32/184C09K11/65
Inventor 吴宥伸和玲潘爱钊
Owner XI AN JIAOTONG UNIV
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