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A kind of preparation method of amphiphilic graphene quantum dot

A graphene quantum dot, amphiphilic technology, applied in graphene, nanotechnology for materials and surface science, nanocarbon, etc., can solve the problems of long reaction time and cumbersome steps, and achieve short reaction time and preparation The effect of simple method and easy large-scale production

Active Publication Date: 2020-06-12
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has the disadvantages of cumbersome steps and long reaction time.

Method used

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  • A kind of preparation method of amphiphilic graphene quantum dot
  • A kind of preparation method of amphiphilic graphene quantum dot
  • A kind of preparation method of amphiphilic graphene quantum dot

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Weigh 4g of citric acid, put it in a 25ml beaker and heat at 200°C until the citric acid melts and turns orange (about 60min);

[0021] (2) Add 0.5ml oleylamine to the orange citric acid pyrolysis solution, and react at 200°C for 6 minutes;

[0022] (3) Add the above-mentioned citric acid and oleylamine reactant dropwise into 100ml of water, shake vigorously until completely mixed;

[0023] (4) Add 100ml of toluene to the above-mentioned mixed solution, shake slowly, and let it stand until the solution is divided into 3 layers;

[0024] (5) discard the upper toluene layer and the lower water layer, retain the middle layer, and the middle layer is a milky white suspension;

[0025] (6) The milky white suspension in the middle layer was freeze-dried for 36 hours to obtain 0.12 g of amphiphilic graphene quantum dots.

[0026] The graphene quantum dots prepared by the method have amphiphilicity.

Embodiment 2

[0028] (1) Weigh 4g of citric acid and place it in a 25ml beaker and heat at 220°C for 50min until the citric acid melts and the pyrolysis solution turns orange;

[0029] (2) Add 1ml oleylamine to the orange citric acid pyrolysis solution, and react at 220°C for 8 minutes;

[0030] (3) Add the above-mentioned citric acid and oleylamine reactant dropwise into 100ml aqueous solution, shake vigorously until completely mixed;

[0031] (4) Add 100ml of toluene to the above solution, shake it up slowly, and let it stand until the solution is divided into 3 layers;

[0032] (5) discard the upper toluene layer and the lower water layer, retain the middle layer, and the middle layer is a milky white suspension;

[0033] (6) The milky white suspension in the middle layer was freeze-dried for 38 hours to obtain 0.23 g of amphiphilic graphene quantum dots.

[0034] The graphene quantum dots prepared by the method have amphiphilicity.

Embodiment 3

[0036] (1) Weigh 2 g of citric acid and place it in a 25ml beaker and heat at 200°C for 30 minutes until the citric acid melts and the pyrolysis solution turns orange;

[0037] (2) Add 0.8ml oleylamine to the orange citric acid pyrolysis solution, and react at 200°C for 5 minutes;

[0038] (3) Add the above-mentioned citric acid and oleylamine reactant dropwise into 100ml aqueous solution, shake vigorously until completely mixed;

[0039] (4) Add 100ml of toluene to the above solution, shake it up slowly, and let it stand until the solution is divided into 3 layers;

[0040] (5) discard the upper toluene layer and the lower water layer, retain the middle layer, and the middle layer is a milky white suspension;

[0041] (6) The milky white suspension in the middle layer was freeze-dried for 36 hours to obtain 0.08 g of amphiphilic graphene quantum dots.

[0042] The graphene quantum dots prepared by the method have amphiphilicity.

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Abstract

The invention provides a preparation method for an amphipathic graphene quantum dot and belongs to the field of preparation of a nanometer material. The method comprises the following steps: (1) taking citric acid, placing into a container, heating and melting at 180-250 DEG C till the citric acid becomes orange; (2) adding a defined amount of oleylamine into the orange citric acid pyrolysis solution and reacting for 3-8min at 180-250 DEG C; (3) stopping heating, dropwise adding the reactant into water and vigorously shaking till completely and uniformly mixing; (4) adding methylbenzene into the uniformly mixed aqueous solution, slowly and uniformly shaking and standing by till the solution is divided into three layers; (5) removing the upper methylbenzene layer and the bottom water layerand reserving a middle layer; (6) freeze-drying the middle layer, thereby acquiring the solid powder, namely, the amphipathic graphene quantum dot. The preparation for the amphipathic graphene quantumdot according to the invention requires no purification, the reaction time is short, the preparation method is simple, the adopted reagents are common and are easily acquired and the preparation method is easy for large-scale production.

Description

technical field [0001] The invention relates to the preparation of nanometer materials, in particular to a method for preparing amphiphilic graphene quantum dots. Background technique [0002] Graphene quantum dots are graphene flakes with a size smaller than 10 nm. Graphene quantum dots have many excellent properties, such as larger surface area, higher mechanical properties, higher electron mobility, and better biocompatibility, so in biomedicine, electronic materials, optical materials, It has important application prospects in the fields of magnetic materials and environmental detection. It should be pointed out that the amphiphilic graphene quantum dots can be better used in drug delivery systems because they are both hydrophilic and lipophilic. [0003] The preparation methods of graphene quantum dots are mainly divided into two categories, top-down method and bottom-up method. The top-down method refers to the chemical or physical treatment of graphene sheets to ob...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/184B82Y30/00
Inventor 杨振华张映鸽李忠平张月霞朱瑞琦李红荣双少敏董川
Owner SHANXI UNIV