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Magnesium ion doped carbon quantum dot as well as preparation and application methods thereof

A technology of carbon quantum dots and magnesium ions, which is applied in the field of magnesium ion-doped carbon quantum dots and its preparation and application, can solve the problems of uneven size distribution, poor dispersion stability, and single function, and achieve high uniformity and particle size. The effect of small, uniform size distribution

Active Publication Date: 2020-08-28
凯盛石墨碳材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problems of uneven size distribution, poor dispersion stability, easy agglomeration and single function of nanoparticle additives existing in the prior art, the present invention provides a magnesium ion-doped carbon quantum dot and its preparation and application method; the magnesium ion Doped with carbon quantum dots as a lubricating oil additive has the characteristics of good water dispersibility, high uniformity, strong self-healing ability, and high reactivity, which can reduce the friction coefficient and wear volume of water-based lubricating base fluid by 60.6% and 81.8% respectively , showing excellent anti-friction and anti-wear properties, and has great application prospects in water lubrication systems

Method used

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  • Magnesium ion doped carbon quantum dot as well as preparation and application methods thereof
  • Magnesium ion doped carbon quantum dot as well as preparation and application methods thereof
  • Magnesium ion doped carbon quantum dot as well as preparation and application methods thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Add 2g C 12 h 22 MgO 14 and 3.18g of 1-aminopropyl-3-methylimidazolium bromide (molar ratio 1:3) were added to the round bottom flask, and the flask was immersed in an oil (simethicone oil) bath at 100 °C, using magnetic force Stir (200 rpm / min) for 20 minutes to make it evenly mixed and form a gel;

[0033] (2) Immerse the round-bottomed flask in step (1) in an oil bath at 200 °C, pass through nitrogen protection, and continue to react for 2 h under magnetic stirring (500 rpm / min);

[0034](3) After the reaction is completed, cool the reaction product of step (2) to room temperature, add 20 mL of ultrapure water, and completely dissolve the reaction product under mechanical stirring to obtain a brown-black dispersion; transfer the dispersion to a centrifuge tube , centrifuge at 12000 rpm / min for 10 min, remove the sediment at the bottom of the centrifuge tube, and keep the upper dispersion containing carbon quantum dots;

[0035] (4) Transfer the upper layer di...

Embodiment 2

[0039] (1) Add 2g C 12 h 22 MgO 14 and 1g of 1-aminopropyl-3-methylimidazolium bromide (molar ratio 1:1) were added to the round bottom flask, and the flask was immersed in an oil (methylphenyl silicone oil) bath at 102 °C, using magnetic force Stir (300 rpm / min) for 25 minutes to make it evenly mixed and form a gel;

[0040] (2) Immerse the round-bottomed flask in step (1) in an oil bath at 180 °C, pass through nitrogen protection, and continue to react for 2.5 h under magnetic stirring (300 rpm / min);

[0041] (3) After the reaction is completed, cool the reaction product of step (2) to room temperature, add 20 mL of ultrapure water, and completely dissolve the reaction product under mechanical stirring to obtain a brown-black dispersion; transfer the dispersion to a centrifuge tube , centrifuge at a speed of 10000 rpm / min for 15 min, remove the sediment at the bottom of the centrifuge tube, and keep the upper layer dispersion containing carbon quantum dots;

[0042] (4) ...

Embodiment 3

[0046] (1) will 2 g C 12 h 22 MgO 14 and 2.12 g Add 1-aminopropyl-3-methylimidazolium bromide (molar ratio 1:2) into a round bottom flask, immerse the flask in an oil bath (methyl chlorophenyl silicone oil) at 105 °C, and stir with magnetic force (400 rpm / min) Stir for 15 min to make it evenly mixed and form a gel;

[0047] (2) Immerse the round-bottomed flask in step (1) in an oil bath at 240 °C, pass through nitrogen protection, and continue to react for 4 h under magnetic stirring (400 rpm / min);

[0048] (3) After the reaction is completed, cool the reaction product of step (2) to room temperature, add 30 mL of ultrapure water, and completely dissolve the reaction product under mechanical stirring to obtain a brown-black dispersion; transfer the dispersion to a centrifuge tube , centrifuge at 8000 rpm / min for 25 min, remove the sediment at the bottom of the centrifuge tube, and keep the upper layer dispersion containing carbon quantum dots;

[0049] (4) Transfer the...

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Abstract

The invention relates to a magnesium ion doped carbon quantum dot as well as preparation and application methods thereof, and is characterized in that 1) under an oil bath condition, magnesium gluconate and 1-aminopropyl-3-methylimidazolium bromide are subjected to melt mixing according to a molar ratio of 1:(1-4), and the mixture is stirred and mixed uniformly to form gel; 2) under the protectionof nitrogen and magnetic stirring, the gel is pyrolyzed at 180-240 DEG C for 1-6 hours, and a product is cooled; 3) the product then is dissolved in ultrapure water to obtain a brownish black dispersion liquid with the ratio of the mass of the product to the volume of water being 1:(10-50), and the dispersion liquid is centrifuged to obtain an upper-layer dispersion liquid containing carbon quantum dots; 4) the upper dispersion liquid is transferred into a dialysis bag then is dialyzed in ultrapure water for 3-5 days; and 5) freeze drying and forced air drying are carried out on the dispersion liquid. The preparation method has the advantages that the magnesium ion doped carbon quantum dots are small in particle size, uniform in size distribution, simple in preparation process, easy to operate and suitable for industrial production; when the magnesium ion doped carbon quantum dots are added into the water-based lubricating base fluid, the average friction coefficient is reduced by 60.6%; and the wear volume is reduced by 81.8%.

Description

technical field [0001] The invention belongs to the technical field of preparation of novel functional nanometer materials, and relates to a magnesium ion-doped carbon quantum dot and a preparation and application method thereof. [0002] technical background [0003] According to reports, one-third of the earth's total energy is consumed in the form of friction, wear causes about 60% of mechanical parts damage, and more than 50% of mechanical failures can be attributed to lubrication failure and excessive wear. The economic loss caused by friction and wear in my country is nearly 60 billion yuan every year. As the natural enemy of friction and wear, lubrication emerges at the historic moment and is ubiquitous in life, production and even aerospace. Lubrication is one of the key technologies to improve the energy utilization efficiency and service life of mechanical equipment. The friction generated by the engine and transmission of ordinary cars consumes about 16.5% of the...

Claims

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Application Information

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IPC IPC(8): C09K11/65B82Y20/00B82Y30/00B82Y40/00C10M125/02C10M125/04C10M169/04C10N30/06
CPCC09K11/65B82Y20/00B82Y30/00B82Y40/00C10M125/02C10M125/04C10M169/04C10M2201/041C10M2201/05C10M2215/042
Inventor 彭寿任东风文贵强李玉峰唐伟伟刘海东陈涛李新雨王文齐李印龙
Owner 凯盛石墨碳材料有限公司
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