Poly-dopamine coated nano-micro powder and preparation method thereof

A polydopamine, nano-micro technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problem of lack of general research on polydopamine coating various powders, and achieve high repeatability, simple operation and wide application range. Effect

Inactive Publication Date: 2016-06-15
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these patents only use polydopamine to coat a single powder, lack of general research on polydopa

Method used

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  • Poly-dopamine coated nano-micro powder and preparation method thereof
  • Poly-dopamine coated nano-micro powder and preparation method thereof
  • Poly-dopamine coated nano-micro powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1.3g vanadium pentoxide (V 2 o 5 , Wako Pure Chemicals Co., Ltd.) was added into 40mL of hydrogen peroxide 10% by weight aqueous solution, and continued to stir for 2-4 hours to obtain a brown transparent sol; in the above sol, slowly drop 5% by weight of hydrazine hydrate ( N 2 h 4 -H 2 (2) aqueous solution, measure the pH value of the solution simultaneously, until the pH value reaches between 4-5 (the pH value is 4.2 in this experiment) stop dripping; Can add tungstic acid as required to make the W:V element content ratio in the solution between Within 5%" Put the above solution in a hydrothermal reaction kettle and heat it at 270°C for 24 hours; After cooling the reaction kettle, take out the product, filter, wash, and dry to obtain a single rutile crystal with excellent thermochromic properties Phase vanadium dioxide (VO 2 (R)) nano powder.

[0032] Take the prepared VO 2 Add 0.5g of powder into 400mL deionized water, stir for 2 hours; 2 A certain amount of...

Embodiment 2

[0035] Take 0.5g of commercially available cesium-doped tungsten oxide nano-micropowder, add it into 400mL deionized water, and stir for 2 hours; add a certain amount of buffer to the cesium-doped tungsten oxide aqueous solution, and then adjust the pH of the solution to 5 with acid / alkali; Dissolve dopamine hydrochloride in deionized water to a concentration of 0.2 g / mL. Take 5 mL of the above-prepared dopamine hydrochloride aqueous solution and slowly add it dropwise into the cesium-doped tungsten oxide aqueous solution; seal the seal and stir for 24 hours to obtain a polydopamine-coated cesium-doped tungsten oxide nano-micro composite with a large specific volume and excellent dispersibility Powder.

[0036] The crystallinity and morphology of the powder were characterized by XRD and TEM. The results show that the polydopamine is uniformly coated on the surface of the cesium-doped tungsten oxide nano-micropowder.

Embodiment 3

[0038]Take 0.5 g of commercially available alumina nano-micropowder, add it into 400 mL of deionized water, and stir for 2 hours; add a certain amount of buffer to the alumina aqueous solution, and then adjust the pH of the solution to 8 with acid / alkali; In deionized water, the concentration is 0.2g / mL. Take 5 mL of the above-prepared dopamine hydrochloride aqueous solution and slowly add it dropwise into the alumina aqueous solution; seal the seal and stir for 24 hours to obtain polydopamine-coated alumina nano-micro composite powder with extremely large specific volume and excellent dispersibility.

[0039] The crystallinity and morphology of the powder were characterized by XRD and TEM. The results show that polydopamine is evenly coated on the surface of alumina nano-micropowder.

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Abstract

The invention relates to a poly-dopamine coated nano-micro powder and a preparation method thereof. The mass ratio of the nano-micro powder to poly-dopamine is (1:1)-(1:9), the dimensional size of the nano-micro powder is 1 nanometer to 50 micrometers, and the coating thickness of the poly-dopamine is less than or equal to 300 nanometers. The poly-dopamine coated nano-micro powder can be used for protection of powder, such as vanadium oxide, with high activity and easy to be oxidized and deteriorated, and also can be used for bridge connection between powder with relatively a few radical groups on the particle surface and difficult to be firmly bonded with a substrate and the substrate, such as caesium doped tungsten oxide, aluminum oxide, tin oxide, metal copper, metal silver, a carbon material and polyaniline.

Description

technical field [0001] The invention relates to a polydopamine-coated nano-micropowder and a preparation method thereof. Background technique [0002] Coating modification of powder is a new technology developed along with the emergence and application of powder technology. The principle is to uniformly introduce one or more other components on the surface of the original powder particles to form an adsorption layer or monolayer film with a certain thickness, thereby changing the surface characteristics of the powder or endowing the powder with new properties. performance. Coating technology plays an important role in improving its dispersion performance and solving its agglomeration problem; in addition, this technology can also improve the activity, optical properties, heat resistance, light resistance, surface color and so on of powder particles. [0003] Inspired by shellfish adhesion proteins, polymerization on dopamine surfaces has attracted great attention in terms ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/60
CPCH01M4/36H01M4/602Y02E60/10
Inventor 高彦峰卢霄玛孙怡婷陈长
Owner SHANGHAI UNIV
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