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Method for preparing noble metal nano material with adjustable particle size by bacteria

A technology of nanomaterials and precious metals, which is applied in the field of preparation of inorganic nanomaterials, can solve problems such as heating and boiling, and achieve the effects of uniform particle size distribution, simple and fast preparation methods, and low cost

Inactive Publication Date: 2013-03-13
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

"This patent uses bacteria to lyse under boiling conditions, and uses the lysate to prepare gold nanosheets. The method is simple, but it needs to be heated and boiled.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Preparation of bean sprouts juice: Add 200g of soybean sprouts to 1000mL of water, boil for 1 hour, filter and replenish the water.

[0021] Preparation of culture medium: Add 50 grams of carbon source material (including 30 grams of maltose and 20 grams of lactose) and 10 grams of nitrogen source material (that is, 10 grams of the above-mentioned bean sprouts juice) into 1 liter of water, adjust the pH to 7 with sodium hydroxide , sterilized for 20 min to obtain a culture solution.

[0022] Weigh 0.1 gram of yeast and 0.1 gram of lactic acid bacteria, add 50 ml of culture medium, shake at 30°C (250r / min), ferment and cultivate for 3 hours, add different amounts of chloroauric acid to the fermentation liquid, and react at 30°C for 24 Hours, gold nanoparticles with different particle sizes are obtained. If the concentration of chloroauric acid in the reaction is 0.5mM to 2.5mM, the particle size of the gold particles is 30nm to 0.5nm, and the aqueous solution of gold nan...

Embodiment 2

[0025] Preparation of culture medium: Add 45 grams of carbon source material (including 5 grams of soluble starch, 20 grams of sucrose, and 20 grams of glucose) and 2 grams of nitrogen source material (including 1 gram of ammonium sulfate and 1 gram of ammonium citrate) to 1 liter of water. Adjust the pH to 6.5 with sodium hydroxide, and sterilize for 20 minutes to obtain a culture solution.

[0026] Weigh 0.1 gram of yeast, add 50 ml of culture medium, shake at 30°C (200r / min), ferment for 24 hours, filter the fermentation broth, add different amounts of chloroauric acid to the fermentation broth, and heat it at 4°C to 35°C The reaction time is 4 days to 0.5 hours (note that the temperature is low and the reaction time is long), and gold nanoparticles with different particle sizes are obtained. If the concentration of chloroauric acid in the filtrate is 0.5mmol / L to 2.5mmol / L, the obtained gold particles A transparent and stable aqueous solution of gold nanoparticles with a d...

Embodiment 3

[0029] Preparation of the culture solution: add 25 grams of carbon source material (i.e. 25 grams of sucrose) to 1 liter of water, without adding nitrogen source material (i.e. 0 g of nitrogen source material), adjust the pH to 8 with sodium hydroxide, and sterilize for 20 minutes to obtain culture medium.

[0030] Weigh 0.5 g of yeast, add 25 ml of culture liquid, shake at 35°C (250r / min), ferment and cultivate for 2 hours, add the gold nanoparticles prepared in Example 2 and different amounts of silver nitrate to the fermentation liquid, Oscillating (100r / min) at 28°C and reacting for 24 hours to obtain gold-silver composite nanoparticles, the shape of the composite particles has a spherical or rod-shaped nanoparticle aqueous solution.

[0031] If palladium chloride (or platinum chloride) is added to the above-mentioned fermentation broth, the method is the same, and the palladium-gold composite nanoparticles (or platinum-gold composite nanoparticles) with good dispersibilit...

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Abstract

The invention relates to a method for preparing noble metal nano material with adjustable particle size by bacteria, and belongs to the technical field of preparation of inorganic nano material. The method comprises the following steps of placing the bacteria in a culture liquid, uniformly mixing, and adding inorganic salts into the culture liquid to ferment, so as to obtain inorganic noble metal nano particles; or placing the bacteria in the culture liquid, culturing, fermenting, and adding the inorganic salts into the bacteria fermenting liquid to carry out reaction, so as to obtain the inorganic noble metal nano particles. The size of the nano particle is controlled by changing the adding amount of the inorganic salts. The bacteria are yeast and lactic acid. The inorganic salts are the inorganic salts of Cu (copper), Ag (silver), Pt (platinum) and Pd (palladium). The method has the advantages that the bacteria, the culture liquid and the inorganic salts are used as raw materials, the noble metal nano material is prepared by the bacteria fermenting, the size of the nano particle is controlled by changing the adding amount of the inorganic salts, and the composite noble metal nano particles different in the configuration are prepared by adding inorganic salts different in the type; and the preparation method is simple, quick and safe.

Description

technical field [0001] The invention relates to a method for preparing inorganic nanometer materials, in particular to a new method for preparing inorganic nanometer materials with adjustable particle size by using bacteria. Background technique [0002] About two-thirds of the elements on the earth are metal elements. The unique mechanical, electrical, optical, magnetic, thermal and catalytic properties of metal nanomaterials have attracted increasing attention from researchers. In particular, noble metal nanomaterials have a special electronic structure and belong to mesoscopic particles. There are surface electronic states on some specific crystal planes, and their Fermi energy level is just located in the forbidden band of the bulk energy band structure along the crystal direction. The electrons in this surface state cannot escape from the periphery due to the constraints of the work function, and cannot go deep into the inner layer due to the restriction of the bulk ene...

Claims

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Application Information

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IPC IPC(8): B22F9/16
Inventor 高峰杨志李昭慧何凤娇
Owner SHANGHAI JIAO TONG UNIV
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