Gold nanoparticles and method for preparing gold nanoparticles by acoustic suspension

A nanoparticle and acoustic levitation technology, applied in nanotechnology, nanotechnology, metal processing equipment, etc.

Active Publication Date: 2021-07-27
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use of acoustic levitation technology for nano-metal synthesis has not yet been reported in literature and patents.

Method used

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  • Gold nanoparticles and method for preparing gold nanoparticles by acoustic suspension
  • Gold nanoparticles and method for preparing gold nanoparticles by acoustic suspension
  • Gold nanoparticles and method for preparing gold nanoparticles by acoustic suspension

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Step (1): Under normal temperature and pressure, take 4.9 mg of HAuCl 4 ·3H 2 O particles, dissolved in 2.5 mL HO 2 O, to get HAuCl 4 ·3H 2 O solution (concentration 5mM). Take 13.3mg of PVP (MW: 58000) powder, dissolve in 2mL H 2 O, obtain PVP solution (concentration 60mM). Take 1.42mg of NaBH 4 powder, dissolved in 0.5mL H 2 O, get NaBH 4 solution (concentration 75mM).

[0039] Step (2): Take 2.5mL of HAuCl prepared in step (1) 4 ·3H 2 O solution was added to 2mL of the prepared PVP solution, and oscillated to make it evenly mixed.

[0040] Step (3): Under normal temperature and pressure, adjust the ultrasonic power of the acoustic levitation instrument to 350W, the ultrasonic frequency to 21KHz, the cross-sectional diameter of the plane transmitting end to 30mm, the curvature radius of the concave reflecting end (spherical surface) to 25mm, and the cross-sectional diameter to 40mm .

[0041] Step (4): Adjust the distance between the emitting end and the ...

Embodiment 2～5

[0045] The operation steps are the same as in Example 1, and some detailed parameters are shown in Table 1.

[0046] The preparation condition of table 1 embodiment 1~5

[0047]

[0048]

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Abstract

The invention relates to the technical field of preparation of nanoparticles, in particular to gold nanoparticles and a method for preparing gold nanoparticles by acoustic suspension. The method comprises the following steps: (1) HAuCl 4 ·3H 2 The mixed solution of O and polyvinylpyrrolidone carries out acoustic suspension, obtains suspension; (2) under the acoustic suspension condition of described step (1), in described suspension, add NaBH 4 Solution, carry out reduction reaction to obtain suspended gold nanoparticles; during the acoustic levitation, the ultrasonic power of the acoustic levitation instrument is 250-450W, the ultrasonic frequency is 20-22KHz, and the distance between the reflection end and the emission end is 35-50mm . The present invention uses NaBH under specific acoustic levitation conditions 4 Solution reduction of HAuCl 4 ·3H 2 O solution, the catalytic performance of the prepared gold nanoparticles is significantly improved compared with the gold nanoparticles prepared by conventional methods.

Description

technical field [0001] The invention relates to the technical field of preparation of nanoparticles, in particular to gold nanoparticles and a method for preparing gold nanoparticles by acoustic suspension. Background technique [0002] Due to the specific electronic structure caused by the quantum size effect, the nano-metal particles show unique physical and chemical properties different from bulk materials. Gold nanoparticles are undoubtedly the most representative metal particles, which have attracted the attention of a large number of scholars and have found great application prospects in catalysis, biology, optics and other aspects. The preparation methods of gold nanoparticles mainly include liquid phase reduction method, template method, photochemical method, electrochemical method, microwave method, seed crystal method and so on. Among them, the liquid-phase reduction method has become a classic method for preparing gold nanoparticles due to its low cost, simple eq...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24B22F1/00B01J23/52B82Y30/00B82Y40/00
CPCB22F9/24B01J23/52B01J35/0013B82Y30/00B82Y40/00B22F1/054
Inventor 阮莹郑宇航庄强魏炳波
Owner NORTHWESTERN POLYTECHNICAL UNIV
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