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Nippon Sheet Glass : Patent Issued for Noble Metal Fine Particle, Method for Withdrawing Noble Metal Fine Particles, and Method for Producing Noble Metal Fine Particle...

05/27/2015 | 04:05pm US/Eastern

Patent Issued for Noble Metal Fine Particle, Method for Withdrawing Noble Metal Fine Particles, and Method for Producing Noble Metal Fine Particle Dispersed Material Using Withdrawn Noble Metal Fine P

By a News Reporter-Staff News Editor at Life Science Weekly -- Nippon Sheet Glass Company, Limited (Tokyo, JP) has been issued patent number 9034215, according to news reporting originating out of Alexandria, Virginia, by NewsRx editors (see also Nippon Sheet Glass Company, Limited).

The patent's inventors are Ogawa, Ryohei (Tokyo, JP); Miyashita, Kiyoshi (Tokyo, JP); Kezuka, Masamichi (Tokyo, JP).

This patent was filed on May 19, 2011 and was published online on May 19, 2015.

From the background information supplied by the inventors, news correspondents obtained the following quote: "There is known a noble metal fine particle dispersed liquid in which noble metal fine particles are dispersed stably with protective colloids. When the noble metal fine particles are taken out from the noble metal fine particle dispersed liquid and used for, for example, producing a conductive material, the noble metal fine particles need to be withdrawn effectively. Usually, when noble metal fine particles need to be withdrawn effectively from a noble metal fine particle dispersed liquid containing protective colloids, a protective colloid remover is added to this noble metal fine particle dispersed liquid to remove the protective colloids to some extent, and a flocculant further is added thereto to aggregate the noble metal fine particles. The following materials can be mentioned as examples of the protective colloid, the protective colloid remover, and the flocculant.

"(Protective Colloid)

"(1) Protein protective colloid: gelatin, gum arabic, casein, a casein compound

"(2) Natural polymer: starch, dextrin, agar, sodium alginate

"(3) Cellulose protective colloid: hydroxyethyl cellulose, carboxymethyl cellulose, methyl cellulose, ethyl cellulose, modified cellulose

"(4) Synthetic polymer protective colloid such as the following.

"Vinyl protective colloid: polyvinyl alcohol, polyvinyl pyrrolidone

"Acrylic protective colloid: sodium polyacrylate, ammonium polyacrylate

"Others: polyethylene glycol, polypropylene glycol

"(Protective Colloid Remover)

"(1) Protein degraing enzyme (such as serine protease)

"(2) Natural polymer degrading enzyme (such as amylase that is a starch degrading enzyme)

"(3) Cellulose degrading enzyme (such as cellulase)

"(4) Organic solvent (such as formamide), acid, alkali

"The numbers indicating the above-mentioned protective colloid removers correspond respectively to the numbers indicating the protective colloids to be removed (for example, the organic solvent listed in (4) is used as the remover for the synthetic polymer protective colloid).

"(Flocculant for Aggregating Noble Metal Fine Particles)

"(1) Anionic flocculant (such as a product obtained by partial hydrolysis of polyacrylamide)

"(2) Cationic flocculant (such as polyacrylamide, and dimethylaminoethyl methacrylate)

"(3) Amphoteric flocculant (such as an alkylamino(meth)acrylate quaternary salt-acrylamide-acrylate copolymer)

"There is also known a method in which an acid is added as a flocculant and the pH thereof is adjusted to accelerate the aggregation.

"Noble metal fine particles withdrawn from a noble metal fine particle dispersed liquid and dried into a powdery state are redispersed in a dispersion medium, such as a solvent and a paste, and the resultant can be used as a coating material, a conductive paste, etc.

"However, in the case of the noble metal fine particle powder withdrawn after the protective colloids have been removed to some extent, the noble metal fine particles have a lower dispersibility (redispersibility) at the time when being redispersed in a dispersion medium such as a solvent. Moreover, the withdrawing method in which a protective colloid remover is added to a noble metal fine particle dispersed liquid and a flocculant further is added thereto requires complicated work.

"There is also known a withdrawing method in which a complexing agent is added to a noble metal fine particle dispersed liquid. However, when a noble metal fine particle powder is withdrawn by this method, it is likely that the adsorbed protective colloids are desorbed and the effect of enhancing the redispersibility by the protective colloids is lowered. Moreover, in this method, the added complexing agent is an impurity that worsens the redispersibility.

"A conventional method for withdrawing noble metal fine particles from a noble metal fine particle dispersed liquid containing protective colloids is disclosed in Patent Literature 1, for example."

Supplementing the background information on this patent, NewsRx reporters also obtained the inventors' summary information for this patent: "Technical Problem

"The present invention is intended to provide a noble metal fine particle having excellent redispersibility after being withdrawn. The present invention is also intended to provide a method for withdrawing noble metal fine particles from a noble metal fine particle dispersed liquid with simple work. Furthermore, the present invention is intended to produce a noble metal fine particle dispersed material using withdrawn noble metal fine particles.

"Solution to Problem

"The present invention provides a noble metal fine particle with a protein adsorbed thereon, including a noble metal fine particle, and a protein adsorbed on a surface of the noble metal fine particle. The protein has an isoelectric point in a range of pH 4.0 to 7.5. An amount of the protein adsorbed is in a range of 3 to 55.1 wt % with respect to a total weight of the noble metal fine particle and the protein.

"The present invention also provides a method for withdrawing noble metal fine particles with proteins adsorbed thereon, the method comprising the steps of

"adjusting pH of a noble metal fine particle dispersed liquid that contains a first dispersion medium that is a liquid, and noble metal fine particles with proteins adsorbed thereon each comprising a noble metal fine particle and a protein adsorbed on a surface of the noble metal fine particle, to an isoelectric point of the protein so that the noble metal fine particles with proteins adsorbed thereon are aggregated in the first dispersion medium, wherein the isoelectric point of the protein is in a range of pH 4.0 to 7.5, and an amount of the protein adsorbed is in a range of 3 to 55.1 wt % with respect to a total weight of the noble metal fine particle and the protein, and the liquid contains no degrading enzyme that degrades the protein; and

"withdrawing the aggregated noble metal fine particles from the first dispersion medium by a solid-liquid separation operation.

"Furthermore, the present invention provides a method for producing a noble metal fine particle dispersed material containing noble metal fine particles with proteins adsorbed thereon, the method comprising the steps of:

"withdrawing noble metal fine particles with proteins adsorbed thereon by the above-mentioned method; and

"dispersing the withdrawn noble metal fine particles in a second dispersion medium.

"Furthermore, the present invention provides a method for producing a noble metal fine particle dispersed material containing noble metal fine particles with proteins adsorbed thereon, the method comprising the steps of:

"adjusting pH of a noble metal fine particle dispersed liquid that contains a first dispersion medium that is a liquid, and noble metal fine particles with proteins adsorbed thereon each comprising a noble metal fine particle and a protein adsorbed on a surface of the noble metal fine particle, to an isoelectric point of the protein so that the noble metal fine particles are aggregated in the first dispersion medium, wherein the isoelectric point of the protein is in a range of pH 4.0 to 7.5, and an amount of the protein adsorbed is in a range of 3 to 55.1 wt % with respect to a total weight of the noble metal fine particle and the protein, and the noble metal fine particles with proteins adsorbed thereon have an average particle diameter of R, and the liquid contains no degrading enzyme that degrades the protein;

"withdrawing the aggregated noble metal fine particles from the first dispersion medium by a solid-liquid separation operation; and

"dispersing the withdrawn noble metal fine particles in a second dispersion medium so as to prepare a noble metal fine particle dispersed material in which noble metal fine particles with proteins adsorbed thereon having an average particle diameter of 0.9 R or more and 1.1 R or less are dispersed.

"Advantageous Effects of Invention

"The noble metal fine particle according to the present invention exhibit satisfactory redispersibility when withdrawn from a noble metal fine particle dispersed liquid and dispersed in another dispersion medium. The withdrawn noble metal fine particle according to the present invention can be used suitably as a raw material for a coating material and a conductive paste, etc. The method for withdrawing noble metal fine particles according to the present invention is a method for withdrawing noble metal fine particles without adding a protective colloid remover, and it can be performed with simple work."

For the URL and additional information on this patent, see: Ogawa, Ryohei; Miyashita, Kiyoshi; Kezuka, Masamichi. Noble Metal Fine Particle, Method for Withdrawing Noble Metal Fine Particles, and Method for Producing Noble Metal Fine Particle Dispersed Material Using Withdrawn Noble Metal Fine Particles. U.S. Patent Number 9034215, filed May 19, 2011, and published online on May 19, 2015. Patent URL: http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1&f=G&l=50&s1=9034215.PN.&OS=PN/9034215RS=PN/9034215

Keywords for this news article include: Peptides, Proteins, Amino Acids, Enzymes and Coenzymes, Nippon Sheet Glass Company Limited.

Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2015, NewsRx LLC

(c) 2015 NewsRx LLC, source Health Newsletters

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