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Van der Waals heterojunction WS2/h-BN and self-assembly preparation method thereof

A heterojunction, h-bn technology, applied in lubricating compositions and other directions, can solve problems such as difficulty in improving lubricating performance, loss of lubricating performance, inability to meet the needs of high-performance solid lubricants, etc., and achieves simple preparation process and simple preparation process. Effect

Pending Publication Date: 2022-07-12
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional solid lubricants (graphite, WS 2 、MoS 2 etc.) Although it can maintain good stability under extreme conditions such as high temperature and high pressure, its lubricating performance is lost due to its own commensurate contact, and the lubricating performance is difficult to improve, which cannot meet the needs of sliding electrical contact materials for high-performance solid lubricants

Method used

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  • Van der Waals heterojunction WS2/h-BN and self-assembly preparation method thereof
  • Van der Waals heterojunction WS2/h-BN and self-assembly preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] van der Waals heterojunction WS 2 Self-assembly preparation of / h-BN:

[0035] (1) Weigh 0.25g of hexagonal boron nitride and disperse it into 200ml of deionized water, weigh 0.75g of tungsten disulfide and disperse it into 600ml of deionized water, and disperse by ultrasonic vibration for 1.0h respectively;

[0036] (2) 0.26g of cationic modifier 2-methylpropanoyloxyethyltrimethylammonium chloride DMC (75wt%) was added dropwise to the hexagonal boron nitride dispersion, and 0.4g of anion was added to the tungsten disulfide dispersion Modifier butyl xanthate;

[0037] (3) stirring the dispersion liquid after adding the modifier on a magnetic stirrer for 3h;

[0038] (4) After stirring, transfer the dispersion of hexagonal boron nitride into a clean beaker, and then drop the tungsten disulfide dispersion into the dispersion of hexagonal boron nitride with a dropper;

[0039] (5) magnetically stir the mixed liquid of hexagonal boron nitride and tungsten disulfide for 4...

Embodiment 2

[0046] van der Waals heterojunction WS 2 Self-assembly preparation of / h-BN:

[0047](1) Weigh 0.25g of hexagonal boron nitride and disperse it into 250ml of deionized water, weigh 0.75g of tungsten disulfide and disperse it into 750ml of deionized water, and disperse by ultrasonic vibration for 1.0h respectively;

[0048] (2) Add 0.35g of cationic modifier polydiallyldimethylammonium chloride PDDA (35wt%) to the hexagonal boron nitride dispersion, and add 0.375g of anionic modifier butyl to the tungsten disulfide dispersion Base xanthate ROCSSNa;

[0049] (3) stirring the dispersion liquid after adding the modifier on a magnetic stirrer for 3h;

[0050] (4) After stirring, transfer the dispersion of hexagonal boron nitride into a clean beaker, and then drop the tungsten disulfide dispersion into the dispersion of hexagonal boron nitride with a dropper;

[0051] (5) magnetically stir the mixed liquid of hexagonal boron nitride and tungsten disulfide for 45min, then let stan...

Embodiment 3

[0055] van der Waals heterojunction WS 2 Self-assembly preparation of / h-BN:

[0056] (1) Weigh 0.25g of hexagonal boron nitride and disperse it into 500ml of deionized water, weigh 0.25g of tungsten disulfide and disperse into 500ml of deionized water, and disperse by ultrasonic vibration for 1.0h respectively;

[0057] (2) 0.57g of cationic modifier polydiallyldimethylammonium chloride PDDA (35wt%) was added dropwise to the hexagonal boron nitride dispersion, and 0.4g of anionic modifier was added to the tungsten disulfide dispersion. Sodium dialkylbenzene sulfonate LAS;

[0058] (3) stirring the dispersion liquid after adding the modifier on a magnetic stirrer for 3h;

[0059] (4) After stirring, transfer the dispersion of hexagonal boron nitride into a clean beaker, and then drop the tungsten disulfide dispersion into the dispersion of hexagonal boron nitride with a dropper;

[0060] (5) magnetically stir the mixed liquid of hexagonal boron nitride and tungsten disulfid...

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Abstract

The invention discloses a Van der Waals heterojunction WS2 / h-BN and a self-assembly preparation method thereof, and belongs to the technical field of preparation of sliding electric contact materials. Anionic and cationic modifiers are adopted to modify the surfaces of tungsten disulfide and hexagonal boron nitride respectively, so that the surfaces of the hexagonal boron nitride are positively charged, the surfaces of the tungsten disulfide are negatively charged, and the hexagonal boron nitride and the tungsten disulfide are driven to be self-assembled layer by layer to form the Van der Waals heterojunction WS2 / h-BN by utilizing the electrostatic attraction effect of the surfaces of the hexagonal boron nitride and the tungsten disulfide. The method is simple in preparation process and can be used for constructing the Van der Waals heterojunction WS2 / h-BN on a large scale. The synthesized Van der Waals heterojunction WS2 / h-BN is a solid lubricating material with super-lubricity, can be used as a lubricating coating, a lubricating oil additive and a self-lubricating composite material for lubrication, and has wide application.

Description

technical field [0001] The invention relates to the technical field of preparation of sliding electrical contact materials, in particular to a van der Waals heterojunction WS 2 / h-BN and its self-assembly preparation method. Background technique [0002] Sliding electrical contact materials are used for current transmission between relative motion mechanisms, and are the core functional components of DC motors, conductive slip rings and other products, and are widely used in rail transit, power generation, industrial production, aerospace, military and other fields. [0003] The sliding electrical contact material is usually composed of two phases, metal and solid lubricant. The metal bears the load and current transmission, and the solid lubricant plays the role of reducing friction and wear resistance. Therefore, solid lubricants with excellent lubricating properties are the key to ensuring long-term stable service of sliding electrical contact materials. Traditional sol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10M169/04
CPCC10M169/04C10M2201/065C10M2201/14
Inventor 方运祺孙阳沈杭燕刘薇程芳郭冰董学杭王馨悦曾文
Owner CHINA JILIANG UNIV
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