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Preparation method for atomic scale precious metal nanoparticle stable colloidal suspension

A technology of nanoparticles and precious metals, which is applied in the field of preparation of stable colloidal suspensions of precious metal particles, can solve problems affecting performance, easy agglomeration, etc., and achieve the effect of regular shape and good dispersion

Inactive Publication Date: 2013-05-08
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the high surface energy of noble metal nanoparticles, it is easy to agglomerate without the presence of surfactants. The noble metal nanoparticles obtained by the above method must have stabilizers and flocculants in the process of preparation and storage, and the addition of surfactants affects Its performance, the smaller the particle size, the more obvious the agglomeration phenomenon

Method used

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  • Preparation method for atomic scale precious metal nanoparticle stable colloidal suspension
  • Preparation method for atomic scale precious metal nanoparticle stable colloidal suspension
  • Preparation method for atomic scale precious metal nanoparticle stable colloidal suspension

Examples

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example 1

[0017] Weigh 0.0500g of chloropalladic acid and place it in 100mL of polyethylene glycol / ethylene glycol with a volume ratio of 1:1 for ultrasonic dispersion to obtain a yellow chloropalladic acid solution, and add sodium hydroxide solution dropwise under magnetic stirring, Adjust the pH to 9, transfer to a 500mL beaker after stirring for 30min, and heat in a microwave oven at 140°C for 3min. After the reaction was completed, it was naturally cooled to room temperature, and the obtained product was suction-filtered with a No. 6 sand core funnel, washed alternately with absolute ethanol and deionized water for 10 times, and then dispersed in absolute ethanol to obtain a stable colloidal suspension of palladium nanoparticles. The product is analyzed by atomic force microscope, the particle size is 1-3 nanometers, the average particle size is 2 nanometers, and it will not agglomerate after long-term storage. Such as figure 1 , the diffraction peaks in the XRD diagram are the cha...

example 2

[0019] Weigh 0.0800g of chloroplatinic acid and place it in 100mL of polyethylene glycol / ethylene glycol with a volume ratio of 1:1 for ultrasonic dispersion to obtain a yellow chloroplatinic acid solution, and add sodium hydroxide solution dropwise under magnetic stirring, Adjust the pH to 9.5, transfer to a 500mL beaker after stirring for 30min, and heat in a microwave oven at 140°C for 3min. After the reaction was completed, it was naturally cooled to room temperature, and the obtained product was suction-filtered with a No. 6 sand core funnel, washed alternately with absolute ethanol and deionized water for 10 times, and then dispersed in absolute ethanol to obtain a stable colloidal suspension of palladium nanoparticles. The product is analyzed by atomic force microscope, the particle size is 0.5-2 nanometers, the average particle size is 1 nanometer, and it will not agglomerate for a long time. Such as figure 2 , which is a transmission electron micrograph of a stable ...

example 3

[0021] Weigh 0.0500g of chloroplatinic acid and place it in 100mL of polyethylene glycol / ethylene glycol with a volume ratio of 1:1 for ultrasonic dispersion to obtain a yellow chloroplatinic acid solution, and add sodium hydroxide solution dropwise under magnetic stirring, Adjust the pH to 9.5, transfer to a 500mL beaker after stirring for 30min, and heat in a microwave oven at 140°C for 3min. After the reaction was completed, it was naturally cooled to room temperature, and the obtained product was suction-filtered with a No. 6 sand core funnel, washed alternately with absolute ethanol and deionized water for 10 times, and then dispersed in absolute ethanol to obtain a stable colloidal suspension of platinum nanoparticles. The product is analyzed by atomic force microscope, the particle size is 1-3 nanometers, and the average particle size is 1.5 nanometers. Such as image 3 , the pH of the system is 9.5, and the polyethylene glycol / ethylene glycol volume ratio is the trans...

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Abstract

The invention relates to a preparation method for atomic scale precious metal nanoparticle stable colloidal suspension. The preparation method comprises the steps: using mixed solvent of polyethylene glycol and ethanediol as stabilizing agent, reducing agent and solvent; using precious metal halogen containing acid as metal resource, adjusting system potential of hydrogen (PH) by sodium hydroxide, and obtaining a reaction product after reaction for three minutes in a microwave reactor in temperature of 140 DET C. after the reaction is finished, the produce is naturally cooled to be room temperature, and the obtained product is sucked and filtered by using a number 6 core hopper, absolute ethyl alcohol and deionized water are alternately washed for ten times and then are dispersed in ethanol solution, the dispersion liquid can be laid aside for a long time, and flocculation and agglomeration cannot occur. Reagent used in the preparation method for the atomic scale precious metal nanoparticle stable colloidal suspension is common, synthesizing steps are simple, cost is low, pollution cannot occur, mass production is easy to conduct, and addition of surfactant and additional reducing agent is can not occur. According to synthetic products, partical size is in atomic scale of 1nm, dispersion is uniform and agglomeration phenomenon can nor occur after the products are placed for a long time.

Description

technical field [0001] The invention relates to a method for preparing an atomic-scale noble metal particle stable colloidal suspension. technical background [0002] Noble metal nanomaterials are an important part of nanomaterials and have their own unique properties. They are very different from traditional noble metal materials in terms of optical, electrical, acoustic, magnetic and mechanical properties. Due to their unique physical and chemical properties of noble metals Organically combined with the special properties of nanomaterials, it has broad application prospects in heterogeneous catalysis, fuel cells, chemical biosensing and other fields, and has received more and more attention. Georgakilas V et al. have found that 1-10nm noble metal nanomaterials have new electronic and catalytic properties [Journal of Materials Chemistry, 2007, 17: 2679-2694]. However, due to the high surface energy of noble metal nanoparticles, it is easy to agglomerate without the presenc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24
Inventor 谢吉民章明美孙倩闫早学陈敏荆俊杰
Owner JIANGSU UNIV
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