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System and method for making non-spherical nanoparticles and nanoparticle compositions made thereby

A technology of metal nanoparticles and compositions, applied in the system field of non-spherical nanoparticles, capable of solving problems such as non-spherical shape processing

Active Publication Date: 2017-08-29
伊沃克纳米公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

While these methods provide good control over size, the resulting non-spherical shapes require further processing before they can be made spherical

Method used

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  • System and method for making non-spherical nanoparticles and nanoparticle compositions made thereby

Examples

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Effect test

Embodiment 5

[0083] Embodiment 5 (coral nanoparticles)

[0084] Laser ablation of the metal target surface was performed by using a 1064 nm wavelength Nd-YAG laser in 3.9 nanosecond pulses to deliver approximately 500 mJ of energy per pulse. The secondary laser is a continuous 532nm laser at 0.5W power, which enters a diffraction grating that produces three distinct electromagnetic fields in front of a gold (Au) target. The distance of the secondary laser in front of the surface of the gold (Au) target was increased from 1 mm (Example 1) to 3 mm, resulting in coral-shaped nanoparticles instead of spherical nanoparticles as in Example 1. The process produced gold (Au) nanoparticles with an average diameter between 25nm and 30nm, with 99+% of those nanoparticles being within 10% of the average diameter.

Embodiment 6

[0085] Embodiment 6 (coral nanoparticles)

[0086] A gold (Au) target was maintained in a chamber through which triple distilled deionized water flowed. Gold (Au) targets were ablated using a master laser with a wavelength of 1064 nm, 80 mJ, with a 3 mm spot size and a 9 nanosecond pulse length. The secondary laser is a continuous 532nm laser at 0.5W power, which enters a diffraction grating that produces three distinct electromagnetic fields in front of a gold (Au) target. The distance of the secondary laser in front of the surface of the gold (Au) target was increased from 1 mm (Example 1) to 3 mm, resulting in coral-shaped nanoparticles instead of spherical nanoparticles as in Example 1. The process produced coral-shaped gold (Au) nanoparticles with an average diameter between 70nm and 80nm, with 99+% of those nanoparticles being within 10% of the average diameter.

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Abstract

Systems and methods for selectively making non-spherical metal nanoparticles from a metal material. The metal target surface is ablated to create an ejecta event or plume containing nanoparticles moving away from the surface. Ablation may be caused by laser or electrostatic discharge. At least one electromagnetic field is placed in front of the solid target surface being ablated. The electromagnetic field manipulates at least a portion of the nanoparticles as they move away from the target surface through the electromagnetic field to create coral-shaped metal nanoparticles. The distance between the electromagnetic field and metal surface can be adjusted to yield metal nanoparticles of a desired size and / or shape.

Description

[0001] background 1. Technical field [0002] Disclosed herein are systems and methods for preparing nanoparticles, more particularly non-spherical nanoparticles having a spherical, coral-like shape. 2. Background technology [0003] A number of different methods for preparing nanoparticles are known in the art. The term "nanoparticle" generally refers to particles of any shape having a largest dimension of less than 100 nm. [0004] US Patent No. 5,585,020 discloses a method of preparing nanoparticles with an average diameter of 73 nm and a standard deviation of 23 nm. The method utilizes laser ablation of target particles with an initial diameter of less than 100 microns in an inert gas or vacuum system. [0005] US Patent No. 7,374,730 discloses a method of preparing nanoparticles in an organic liquid medium and using stabilizers such as surfactants or coating agents or other hydrocarbon materials to prevent agglomeration or growth of the nanoparticles. [0006] US Pa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/04B82Y40/00B22F1/054
CPCB23K26/032B23K26/123B23K26/127B23K26/40B23K26/082B23K26/0622B82Y30/00B23K26/361B23K26/1224B22F2999/00B22F9/04B82Y40/00B23K2103/02B23K2103/08B23K2103/12B23K2103/14B23K2103/26B22F1/0553B22F1/054B22F2202/05B22F2202/06B22F2202/11B22F1/065B23K26/362B23K26/16B23K26/0604B23K26/06B23K26/08
Inventor 威廉·哈罗德·尼德迈尔
Owner 伊沃克纳米公司
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