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Carbon quantum dot with ionic liquid structure as well as preparation method and application of carbon quantum dot

A technology of carbon quantum dots and ionic liquids, applied in the field of quantum dots, can solve the problem of not being able to be used directly as a liquid lubricant, and achieve the effects of suppressing high surface energy, excellent anti-friction and anti-wear ability, and strong adsorption ability

Active Publication Date: 2022-03-08
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The structure of carbon quantum dots with ionic liquid structure is stable, and the preparation method is simple, which effectively solves the problem that carbon quantum dots cannot be used directly as liquid lubricants, and expands the scope and application prospects of carbon quantum dots as lubricants or additives in the field of lubrication engineering

Method used

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  • Carbon quantum dot with ionic liquid structure as well as preparation method and application of carbon quantum dot
  • Carbon quantum dot with ionic liquid structure as well as preparation method and application of carbon quantum dot
  • Carbon quantum dot with ionic liquid structure as well as preparation method and application of carbon quantum dot

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Embodiment 1

[0032] First, add anhydrous citric acid into the beaker and keep it at 240°C for 1h. After stopping the heating, add deionized water to the reaction system, and ultrasonically disperse for 40min. Then, the aqueous solution was extracted three times with ethyl acetate to remove unreacted raw materials and by-products. Then add deionized water to the ethyl acetate system, and remove the ethyl acetate by rotary evaporation to obtain an aqueous solution of carbon quantum dots. The transmission electron microscope photos and particle size distribution diagrams of the carbon quantum dot microscopic morphology are shown in the appendix figure 1 .

[0033] Add dibutylamine dropwise to the aqueous solution of carbon quantum dots while stirring until the pH value of the aqueous solution is greater than 7. After the addition is complete, stir at room temperature for 1 h. After the reaction, the reaction solution was divided into two layers, the organic phase was removed, and the aqueo...

Embodiment 2

[0035] First, add anhydrous citric acid into the beaker and keep it at 240°C for 1h. After stopping the heating, add deionized water to the reaction system, and ultrasonically disperse for 40min. Then, the aqueous solution was extracted three times with ethyl acetate to remove unreacted raw materials and by-products. Then add deionized water to the ethyl acetate system, and remove the ethyl acetate by rotary evaporation to obtain an aqueous solution of carbon quantum dots.

[0036] To the carbon quantum dot aqueous solution, tributylamine was added dropwise while stirring until the pH value of the aqueous solution was greater than 7, and after the dropwise addition was completed, it was stirred at room temperature for 2 hours. After the reaction, the reaction solution was divided into two layers, the organic phase was removed, and the aqueous phase was retained. The aqueous phase system was extracted three times with petroleum ether to remove unreacted raw materials. Then, ...

Embodiment 3

[0038] First, add anhydrous citric acid into the beaker and keep it at 240°C for 1h. After stopping the heating, add deionized water to the reaction system, and ultrasonically disperse for 40min. Then, the aqueous solution was extracted three times with ethyl acetate to remove unreacted raw materials and by-products. Then add deionized water to the ethyl acetate system, and remove the ethyl acetate by rotary evaporation to obtain an aqueous solution of carbon quantum dots.

[0039] To the carbon quantum dot aqueous solution, add tetrabutylammonium hydroxide aqueous solution dropwise while stirring until the pH value is 7. After the dropwise addition is completed, stir at room temperature for 0.5h. Then, the moisture in the solution was removed by rotary evaporation, and after vacuum drying at 60° C. for 24 hours, tetrabutylammonium salt carbon quantum dots were obtained, which were designated as: QBA-CDs.

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Abstract

The invention relates to an ionic liquid structure carbon quantum dot and a preparation method and application thereof, an ionic bond modification method is adopted, the ionic liquid structure carbon quantum dot which is in a liquid state at the room temperature is obtained through a simple acid-base neutralization reaction at the room temperature, and the structure of the ionic liquid structure carbon quantum dot is shown in the formula (1). The carbon quantum dot with the ionic liquid structure is stable in structure, the preparation method is simple, the problem that the carbon quantum dot cannot be directly used as a liquid lubricant is effectively solved, and the application range and the application prospect of the carbon quantum dot as a lubricant or an additive in the field of lubrication engineering are expanded. The carbon quantum dot part in the ionic liquid structure carbon quantum dot exists in the form of anions and can form very strong adsorption capacity with the surface of a friction pair through electrostatic acting force, so that excellent friction reduction and wear resistance are shown, and the problems of friction wear and poor lubrication in the operation process of high-end equipment can be effectively solved.

Description

technical field [0001] The invention relates to the field of quantum dots, in particular to a carbon quantum dot with an ionic liquid structure, its preparation method and its application as a lubricant. Background technique [0002] Due to the rapid development of industry, friction and wear have become an important reason for the failure of high-end equipment such as aerospace and electronic technology. The energy loss caused by friction and wear is as high as 23% every year, and about 80% of the mechanical parts in the world fail. for wear and tear. Grease is an important way to reduce friction and wear. Choosing the right grease can effectively reduce the friction and wear of mechanical parts and ensure the effective operation of equipment. Carbon quantum dots are a kind of light-emitting nano-carbon material with a size below 10nm and a quasi-spherical structure. Its inner core is a sp2 or sp3 hybrid graphene-like structure. It has self-healing, high strength, and chem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C211/07C07C211/63C07C209/68C01B32/15C10M141/06C10M169/04C10N30/06
CPCC07C211/07C07C211/63C07C209/68C01B32/15C10M141/06C10M169/04C01P2004/04C01P2004/64C01P2004/51C07B2200/11C10M2201/041C10M2215/04C10M2205/0206C10N2030/06C10N2020/06Y02P20/54
Inventor 张松伟胡丽天李毅丁奇李昊坤秦宝锋
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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