Method for preparing hydrophobic noble metal nano granules using microwave

A technology of nanoparticles and precious metals, applied in the direction of coating, etc., can solve the problems of metal nanoparticles that cannot be applied to microwave radiation methods, cannot be mass-produced, easy to burn and volatilize, and achieve rapid preparation, small particle size, and dispersion Good results

Inactive Publication Date: 2006-10-11
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

Thus surface-modified gold nanoparticles that are easily soluble in non-polar solvents can be obtained, but the solvents used, such as chloroform and toluene, have low boiling points, are easy to burn and volatilize, pollute the environment, and cannot be mass-produced
In particular, microwave radiation methods cannot be used to prepare metal nanoparticles

Method used

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  • Method for preparing hydrophobic noble metal nano granules using microwave
  • Method for preparing hydrophobic noble metal nano granules using microwave

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030]Preparation method of n-octadecylamine-protected gold nanoparticles. Use a pipette to draw 1.0ml of chloroauric acid solution into a beaker, heat and evaporate to dryness, put 0.05g of n-octadecylamine, then add 20ml of n-heptane, 1.0ml of ethanol with a molar concentration of 0.2M NaOH solution, the mol ratio of n-octadecylamine and chloroauric acid is 40:1, and the volume ratio of n-heptane and 0.2M NaOH in ethanol is 4:1. The system was ultrasonically oscillated for about 30 minutes, and the obtained system was an orange-yellow clear solution. Place the beaker in the center of the microwave tray and stir on medium speed for about 20 minutes. Then heat continuously for 60 seconds with a microwave oven, the frequency is 2450MHz, and the power is 750W, and the heating is stopped after the solution changes color. After continuing to stir for 30 minutes, a purple gold sol was obtained.

[0031] The obtained gold sol was rotary evaporated to nearly dryness, and absolute ...

Embodiment 2

[0033] Use a pipette to draw 1.0ml of chloroauric acid aqueous solution and place it in a beaker, heat and evaporate to a certain amount of n-tetradecyl mercaptan, then add 20ml of n-heptane, 4.5ml of absolute ethanol and 1.0ml of ethanol with 0.2M NaOH solution, the molar ratio of n-tetradecyl mercaptan to chloroauric acid is 20:1, and the volume ratio of n-heptane to absolute ethanol is 2:1. The system was ultrasonically oscillated for about 20 minutes to 1 hour, and the obtained system was an orange-yellow clear solution. Place the beaker in the center of the microwave tray and stir on medium speed for about 20 minutes. Then heat continuously for 60 seconds with a modified microwave oven, the frequency is 2450MHz, and the power is 80W. After the solution changes color, stop heating, stop heating, and continue stirring for 30 minutes to obtain a deep purple gold sol.

[0034] The obtained gold sol was rotary evaporated to nearly dryness, and absolute ethanol was added to it...

Embodiment 3

[0036] Use a pipette to draw 0.30ml palladium nitrate aqueous solution into a beaker, heat and evaporate to dryness, put a certain amount of n-tetradecylamine, then add 15.0 n-octane, 2.5ml octanol and 0.20ml 0.1MKOH ethanol solution to make The molar ratio of n-tetradecylamine to palladium nitrate is 30:1, and the volume ratio of n-octane to absolute ethanol is 3:1. The system was ultrasonically shaken for about 20 minutes to 1 hour, and the resulting system was a clear solution. Place the beaker in the center of the microwave tray and stir on medium speed for about 5 minutes. Then heat continuously for 30 seconds with a modified microwave oven, the frequency is 2450 MHz, and the power is 500 W. After the solution changes color, stop heating, stop heating, and continue stirring for 10 minutes to obtain black palladium sol.

[0037] The resulting palladium sol was rotary evaporated to nearly dryness, and absolute ethanol was added therein, and the palladium nanoparticles prot...

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Abstract

The invention belongs to the field of preparation of metal nanoparticles, in particular to a method for preparing hydrophobic noble metal nanoparticles by using microwaves in an organic solvent with a high boiling point and low pollution. The invention uses alcohol to reduce noble metal compounds in a safe organic solvent reverse micelle system, and prepares surfactant-protected hydrophobic noble metal nanoparticles through microwave radiation. The method for preparing hydrophobic noble metal nanoparticles has the advantages of rapidity and good reproducibility, and is expected to realize mass production. In addition, the invention can be extended to the preparation of other hydrophobic metal nanoparticles.

Description

technical field [0001] The invention belongs to the field of preparation of metal nanoparticles, in particular to a method for preparing hydrophobic noble metal nanoparticles by using microwaves in an organic solvent with a high boiling point and low pollution. Background technique [0002] Noble metal nanoparticles are widely used in the fields of catalysis, nanotechnology, and biomedical engineering, among which the preparation of hydrophobic nanoparticles is the most complicated. The preparation of noble metal nanoparticles and colloids with small particles and narrow distribution can be accomplished by aggregating single noble metal atoms into nano-metal clusters. The main methods include chemical reduction, photolysis, pyrolysis, ultrasonic decomposition, electrolysis, etc. In order to prevent the agglomeration of metal nanoparticles, stabilizers are often added to the system. There are two methods: electrostatic stabilization (adding inorg...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24B22F1/02
Inventor 江龙杜玉扣沈明荣惠林李津如
Owner INST OF CHEM CHINESE ACAD OF SCI
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