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Metal fine particles, composition containing the same, and production method for producing metal fine particles

a technology of metal fine particles and compositions, applied in the field can solve the problems of reducing the absorption capacity binders, and reliability, and achieve the effects of reducing the absorption capacity, reducing the stability of metal fine particles, and increasing the cost of metal fine particles

Inactive Publication Date: 2006-11-30
MITSUBISHI MATERIALS CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides metal fine particles with specific properties, including an aspect ratio, maximum absorption wavelength, and absorption coefficient. The metal fine particles can be produced by reducing metal ions in an aqueous solution containing a surfactant. The reducing and controlling of the aspect ratio can be simultaneous or separate steps. The metal fine particles can be produced using chemical reduction, electrochemical reduction, photoreduction, or a combination of these methods. The metal fine particles can be dispersed in a solution containing a dispersing agent and a binder. The production methods and compositions provide a way to control the properties of metal fine particles for various applications.

Problems solved by technology

Many color filters containing a dye having a specific chemical structure discolor or decrease their absorption capacity when a long time has passed, because the dye has inferior heat resistance, light resistance, and chemical resistance compared with pigments and metal fine particles, and they have problems in reliability.
Therefore, it is impossible to disperse the metal fine particles in many solvents, binders, and production of a coating is difficult.
Therefore, it is difficult to adjust the area of the immersed silver plate, and control sufficiently the aspect ratio of the metal nano-rods.
However, a reaction vessel for obtaining the seed particles and a reaction vessel for growing the seed particles are necessary, and production processes are complicated and troublesome.
However, this method has a problem in that the reaction time is long.

Method used

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  • Metal fine particles, composition containing the same, and production method for producing metal fine particles
  • Metal fine particles, composition containing the same, and production method for producing metal fine particles
  • Metal fine particles, composition containing the same, and production method for producing metal fine particles

Examples

Experimental program
Comparison scheme
Effect test

example 1

Production Method for Gold Fine Particles

[0100] To 50 ml of 0.50 mol / L-CTAB (hexadecyltrimethylammonium bromide) aqueous solution, 5 ml of 24 mmol / L-chloroauric acid aqueous solution, 1 ml of acetone, 1 ml of cyclohexane, 1 ml of cyclohexanone, and 5 ml of 10 mmol / L-silver nitrate aqueous solution were added to produce the reaction solution. To the reaction solution, 5 ml of 40 mmol / L-ascorbic acid (AS) aqueous solution was added to initiate chemical reduction. Just after the AS aqueous solution was added, the color of the reaction solution changed from orange to transparent and colorless. The transparent and colorless solution was put into a 100 ml-beaker, and ultraviolet light generated in a UV irradiation device (high-pressure mercury lamp) was irradiated directly onto the synthesis solution from the upper part of the beaker for five minutes. After irradiation, the synthesis solution was left to rest for one hour, and transferred to a storage vessel. Then the solution was ten-t...

example 2

Gold Fine Particles Surface-Treated with a Dispersing Agent

[0102] 0.1 g of the dispersing agent (Solsperse 24000SC; marketed by Avecia Ltd.) was dissolved in 10 g of toluene. To the toluene solution containing the dispersing agent, 50 g of the aqueous dispersing solution of the gold nano-rods (the average length in the short axis: 10 nm; the average length in the long axis: 42 nm, and the aspect ratio: 4.2) synthesized in Example 1, was added, and they were aggregated for ten minutes using an aggregator (revolution speed: 300 rpm). To the obtained solution, 30 g of ethanol was added, and this was left to rest for twenty-four hours. The solubility of CTAB increased by adding ethanol, and CTAB absorbed in the surface of the gold nano-rods was desorpted. Then, nitrogen portions of the dispersing agent were absorbed in gold nano-rods and they were replaced with CTAB, and the surface treatment was performed.

[0103] The mixture, which was left to rest, was separated into a transparent a...

example 3

Gold Fine Particle Composition and Film

[0105] The coating was obtained by mixing 5 g of the gold nano-rods concentrated solution obtained in Example 2 in 20 g of a mixture containing a radical polymerizable urethane oligomer and a radical polymerization initiator. The obtained coating did not change color or generate precipitations, and was stable even though it was left under conditions in which light was blocked and at room temperature for three months or longer.

[0106] The coating was coated on the glass plate (gold fine particle content: 1% by weight, and dried film thickness: 10 μm), and the transmitted spectrum was measured. The results are shown in FIG. 3. As shown in FIG. 3, the transmissivity around the wavelength (870 nm) which corresponds to the peak position of the maximum absorption wavelength shown in FIG. 2 was the lowest. Thereby, it was confirmed that the specific wavelength was absorbed by the gold nano-rods.

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PUM

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Abstract

The present invention provides metal fine particles which have selective wavelength absorption characteristics in a wavelength region from visible light to near infrared light, and have sharp absorption characteristics, and influences little the surrounding wavelength, and therefore, they yield tones having high chroma. The present invention provides metal fine particles wherein an aspect ratio is in a range from 1.1 to 8.0, a maximum absorption wavelength in plasmon absorption is in a range from 400 nm to 1,200 nm, and an absorption coefficient at a peak position of the maximum absorption wavelength is in a range from 6,000 to 20,000 L / mol·cm (measurement concentration: 1.6×10−4 mol / L, and solvent:water).

Description

CROSS-REFERENCE TO PRIOR APPLICATION [0001] This is a U.S. National Phase Application under 35 U.S.C. §371 of International Patent Application no. PCT / JP2004 / 013087 filed Sep. 2, 2004, and claims the benefit of Japanese Patent Application Nos. 2003-314208 filed Sep. 5, 2003, 2004-116253 filed Apr. 9, 2004 and 2004-116254 filed Apr. 9, 2004, all of which are incorporated by reference herein. The International Application was published in Japanese on Mar. 17, 2005 as WO 2005 / 023466 al under PCT Article 21(2).TECHNICAL FIELD [0002] The present invention relates to metal fine particles which have selective wavelength absorption characteristics at a certain wavelength in a wavelength region from visible light to near infrared light, and have sharp absorption characteristics having a high absorbance and a narrow absorption spectrum width at the wavelength, and preferably relates to gold fine particles, in particular, gold fine particles having a rod shape in nano-size (abbreviated as “gol...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B22F9/24C22C5/02
CPCB22F1/0025B22F9/24B22F2999/00B82Y30/00C22C5/02C23C24/00C23C24/08B22F1/0088B22F1/0085Y10S977/899B22F1/0547B22F1/142B22F1/145
Inventor TAKATA, YOSHIAKIHIRATA, HIROKISATOH, JUN-ETSUNIIDOME, YASUROYAMADA, SUNAONISHIOKA, KOJIKAWASAKI, HIDEYAMIZOGUCHI, DAIGOUNAGAI, MASANORIMUROUCHI, MASATOISHIHARA, MASAOKI
Owner MITSUBISHI MATERIALS CORP
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