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Onion-shaped fullerene clad metal palladium core shell structure nano-particle and preparation method thereof

A technology of onion-like fullerenes and nanoparticles, which can be used in metal processing equipment, nanotechnology, transportation and packaging, and can solve the problems of expensive preparation costs and poor crystallinity

Inactive Publication Date: 2016-09-21
LASER FUSION RES CENT CHINA ACAD OF ENG PHYSICS
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Problems solved by technology

Since this method is to use oxygen plasma to oxidize the surface of palladium nanoparticles and grow carbon layers by chemical deposition, different professional instruments are required respectively, resulting in expensive preparation costs. Moreover, the core-shell structure nanoparticles prepared by this method have a high surface area. The carbon layer is thinner and less crystalline

Method used

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  • Onion-shaped fullerene clad metal palladium core shell structure nano-particle and preparation method thereof
  • Onion-shaped fullerene clad metal palladium core shell structure nano-particle and preparation method thereof
  • Onion-shaped fullerene clad metal palladium core shell structure nano-particle and preparation method thereof

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preparation example Construction

[0048] The method for preparing onion-like fullerene-coated metal palladium core-shell structure nanoparticles of the present invention comprises the following steps:

[0049] Step 1: Preparation of Sodium 2,4-Dihydroxybenzoate-Formaldehyde Sol

[0050] Dissolve 2,4-dihydroxybenzoic acid and sodium hydroxide in deionized water to prepare a solution, then add formaldehyde and stir to form a 2,4-dihydroxybenzoic acid sodium-formaldehyde solution; then add sodium hydroxide to adjust the pH value The pH value of 2,4-dihydroxybenzoic acid sodium-formaldehyde solution until it becomes 2,4-dihydroxybenzoic acid sodium-formaldehyde sol.

[0051] Preferably, 2,4-dihydroxybenzoic acid, sodium hydroxide and formaldehyde are formulated into 2,4-dihydroxybenzoic acid sodium-formaldehyde solution according to the molar ratio of 1:1:4, and the sodium hydroxide pH value regulator Adjust the pH of the solution to 7-9, then dilute with deionized water.

[0052] Step 2: Preparation of sodium 2...

Embodiment 1

[0063] According to the molar ratio of 2,4-dihydroxybenzoic acid, sodium hydroxide and formaldehyde at a ratio of 1:1:4, a 2,4-dihydroxybenzoic acid sodium-formaldehyde gel with a volume of 100 mL and a density of 0.1 g / mL was prepared. Wherein, the density of 2,4-sodium dihydroxybenzoate-formaldehyde gel is obtained by dividing the mass of sodium 2,4-dihydroxybenzoate plus formaldehyde by the volume of sodium 2,4-dihydroxybenzoate-formaldehyde solution.

[0064] Dissolve 5.2g of 2,4-dihydroxybenzoic acid and 1.35g of sodium hydroxide in deionized water first. At this time, the volume of deionized water used should not exceed 70mL to form a solution. 2,4-dihydroxybenzoic acid reacts with sodium hydroxide to generate sodium 2,4-dihydroxybenzoate, thereby obtaining a sodium 2,4-dihydroxybenzoate solution.

[0065] Add 10mL of formaldehyde solution with a concentration of about 38wt% into the sodium 2,4-dihydroxybenzoate solution, and stir evenly to form a light yellow transparen...

Embodiment 2

[0070] Prepare 2,4-dihydroxybenzoic acid sodium-formaldehyde gel with a volume of 100 mL and a density of 0.3 g / mL according to the molar ratio of 2,4-dihydroxybenzoic acid, sodium hydroxide and formaldehyde at a ratio of 1:1:4. Wherein, the density of 2,4-sodium dihydroxybenzoate-formaldehyde gel is obtained by dividing the mass of sodium 2,4-dihydroxybenzoate plus formaldehyde by the volume of sodium 2,4-dihydroxybenzoate-formaldehyde solution.

[0071] Dissolve 15.6g of 2,4-dihydroxybenzoic acid and 4.06g of sodium hydroxide in deionized water first. At this time, the volume of deionized water used should not exceed 50mL to form a solution. 2,4-dihydroxybenzoic acid reacts with sodium hydroxide to generate sodium 2,4-dihydroxybenzoate, thereby obtaining a sodium 2,4-dihydroxybenzoate solution.

[0072] Add 32mL of formaldehyde solution with a concentration of about 38wt% into the sodium 2,4-dihydroxybenzoate solution, and stir evenly to form a light yellow transparent liqui...

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Abstract

The invention provides an onion-shaped fullerene clad metal palladium core shell structure nano-particle and a preparation method thereof. The onion-shaped fullerene clad metal palladium core shell structure nano-particle is prepared as follows: 2, 4-dihydroxyl sodium benzoate-formaldehyde solution is prepared with 2, 4-dihydroxy-benzoic acid, sodium hydroxide and formaldehyde as raw materials, and is changed to sol through adjusting the pH value thereof; the sol is stood to obtain gel; then, 2, 4-dihydroxyl sodium benzoate-formaldehyde gel is put in Pd2+ contained palladium salt solution to dip for ion exchange to obtain Pd2+ carried 2, 4-dihydroxyl sodium benzoate-formaldehyde gel; and the Pd2+ carried 2, 4-dihydroxyl sodium benzoate-formaldehyde gel is grinded to gel powder for heating to 950-1500 DEG C in a mixed atmosphere of oxygen and inert gas, and is cooled in a pure inert gas atmosphere to obtain the onion-shaped fullerene clad metal palladium core shell structure nano-particle.

Description

technical field [0001] The invention relates to the field of nanoparticle preparation, in particular to an onion-like fullerene-coated metal palladium core-shell nanoparticle and a preparation method thereof. Background technique [0002] Metal palladium nanoparticles are very good catalysts, and are widely used in hydrodehydrogenation of organic matter, petroleum refining, automobile exhaust purification, high-energy fuel cells, etc. At the same time, palladium nanomaterials are also widely used in hydrogen storage and chemical sensors. However, single palladium nanoparticles have poor stability, and are easy to agglomerate, grow and lose during use, resulting in changes in their properties and performance decline. Wrapping a protective layer on the outer layer of the nanoparticles can isolate the palladium particles from each other, prevent them from sintering and grow, and have better environmental stability. Moreover, since the protective layer also changes the origina...

Claims

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Application Information

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IPC IPC(8): B22F1/02B82Y40/00
CPCB82Y40/00B22F2302/40B22F2301/25B22F1/17B22F1/054
Inventor 杨曦付志兵李佳袁磊赵海波米睿王朝阳张厚琼
Owner LASER FUSION RES CENT CHINA ACAD OF ENG PHYSICS
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