JPH03215606A - Manufacture of noble metal fine particles - Google Patents
Manufacture of noble metal fine particlesInfo
- Publication number
- JPH03215606A JPH03215606A JP1003490A JP1003490A JPH03215606A JP H03215606 A JPH03215606 A JP H03215606A JP 1003490 A JP1003490 A JP 1003490A JP 1003490 A JP1003490 A JP 1003490A JP H03215606 A JPH03215606 A JP H03215606A
- Authority
- JP
- Japan
- Prior art keywords
- noble metal
- fine particles
- solution
- water
- reducing agent
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 229910000510 noble metal Inorganic materials 0.000 title claims abstract description 34
- 239000010419 fine particle Substances 0.000 title claims abstract description 29
- 238000004519 manufacturing process Methods 0.000 title abstract 2
- 229920002101 Chitin Polymers 0.000 claims abstract description 19
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 11
- NWZSZGALRFJKBT-KNIFDHDWSA-N (2s)-2,6-diaminohexanoic acid;(2s)-2-hydroxybutanedioic acid Chemical compound OC(=O)[C@@H](O)CC(O)=O.NCCCC[C@H](N)C(O)=O NWZSZGALRFJKBT-KNIFDHDWSA-N 0.000 claims abstract description 7
- IKDUDTNKRLTJSI-UHFFFAOYSA-N hydrazine monohydrate Substances O.NN IKDUDTNKRLTJSI-UHFFFAOYSA-N 0.000 claims abstract description 7
- 150000008044 alkali metal hydroxides Chemical class 0.000 claims abstract description 5
- 239000008098 formaldehyde solution Substances 0.000 claims abstract description 3
- 238000000034 method Methods 0.000 claims description 11
- 239000010970 precious metal Substances 0.000 claims description 11
- 229910001854 alkali hydroxide Inorganic materials 0.000 claims description 4
- 239000002245 particle Substances 0.000 abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 15
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 abstract description 6
- KWYUFKZDYYNOTN-UHFFFAOYSA-M potassium hydroxide Substances [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 abstract description 6
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 abstract description 2
- 150000003839 salts Chemical class 0.000 abstract 4
- 239000007788 liquid Substances 0.000 abstract 1
- 239000002923 metal particle Substances 0.000 abstract 1
- 239000000243 solution Substances 0.000 description 30
- 239000002253 acid Substances 0.000 description 6
- OAKJQQAXSVQMHS-UHFFFAOYSA-N Hydrazine Chemical compound NN OAKJQQAXSVQMHS-UHFFFAOYSA-N 0.000 description 4
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 4
- 235000002597 Solanum melongena Nutrition 0.000 description 4
- 238000004220 aggregation Methods 0.000 description 4
- 230000002776 aggregation Effects 0.000 description 4
- 238000009835 boiling Methods 0.000 description 4
- 239000007864 aqueous solution Substances 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 239000000084 colloidal system Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000003960 organic solvent Substances 0.000 description 2
- 229910052763 palladium Inorganic materials 0.000 description 2
- PIBWKRNGBLPSSY-UHFFFAOYSA-L palladium(II) chloride Chemical compound Cl[Pd]Cl PIBWKRNGBLPSSY-UHFFFAOYSA-L 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 238000010992 reflux Methods 0.000 description 2
- 229910052703 rhodium Inorganic materials 0.000 description 2
- 239000010948 rhodium Substances 0.000 description 2
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 description 2
- SONJTKJMTWTJCT-UHFFFAOYSA-K rhodium(iii) chloride Chemical compound [Cl-].[Cl-].[Cl-].[Rh+3] SONJTKJMTWTJCT-UHFFFAOYSA-K 0.000 description 2
- 229910001020 Au alloy Inorganic materials 0.000 description 1
- 108010010803 Gelatin Proteins 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- OVRNDRQMDRJTHS-UHFFFAOYSA-N N-acelyl-D-glucosamine Natural products CC(=O)NC1C(O)OC(CO)C(O)C1O OVRNDRQMDRJTHS-UHFFFAOYSA-N 0.000 description 1
- OVRNDRQMDRJTHS-FMDGEEDCSA-N N-acetyl-beta-D-glucosamine Chemical compound CC(=O)N[C@H]1[C@H](O)O[C@H](CO)[C@@H](O)[C@@H]1O OVRNDRQMDRJTHS-FMDGEEDCSA-N 0.000 description 1
- 229910001252 Pd alloy Inorganic materials 0.000 description 1
- 229910000629 Rh alloy Inorganic materials 0.000 description 1
- YDZWPBPSQHXITB-UHFFFAOYSA-N [Rh].[Au] Chemical compound [Rh].[Au] YDZWPBPSQHXITB-UHFFFAOYSA-N 0.000 description 1
- 239000003929 acidic solution Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229920000159 gelatin Polymers 0.000 description 1
- 239000008273 gelatin Substances 0.000 description 1
- 235000019322 gelatine Nutrition 0.000 description 1
- 235000011852 gelatine desserts Nutrition 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000003353 gold alloy Substances 0.000 description 1
- BBKFSSMUWOMYPI-UHFFFAOYSA-N gold palladium Chemical compound [Pd].[Au] BBKFSSMUWOMYPI-UHFFFAOYSA-N 0.000 description 1
- JUWSSMXCCAMYGX-UHFFFAOYSA-N gold platinum Chemical compound [Pt].[Au] JUWSSMXCCAMYGX-UHFFFAOYSA-N 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229950006780 n-acetylglucosamine Drugs 0.000 description 1
- 239000006072 paste Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 229920003169 water-soluble polymer Polymers 0.000 description 1
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は触媒、各種ペースト、コロイド溶液等貴金属の
微粒子を調製する方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for preparing fine particles of noble metals such as catalysts, various pastes, and colloidal solutions.
（従来技術とその問題点）
従来、貴金属の微粒子としては２００人以上の大きさの
ものしか安定した微粒子として調製することが出来てい
ない。(Prior art and its problems) Conventionally, only stable fine particles of noble metals with a size of 200 or more have been able to be prepared.
その主な方法として、貴金属の酸性溶液に保護コロイド
としてゼラチン等を加え、貴金属を水素やヒドラジン等
の還元剤で還元する方法や、貴金属を有機溶媒に抽出し
たのち、該有機溶媒を微細な粒子として不活性ガス気流
中に分散させ加熱分解して、貴金属に還元し微粒子とす
る方法等がある。The main methods are to add gelatin etc. as a protective colloid to an acidic solution of precious metals and reduce the precious metals with a reducing agent such as hydrogen or hydrazine, or to extract the precious metals into an organic solvent and then convert the organic solvent into fine particles. As a method, there is a method of dispersing it in an inert gas stream and thermally decomposing it to reduce it to a noble metal and make it into fine particles.
しかし、貴金属の溶液の濃度や保護コロイドの量や、他
の高分子の界面活性剤等の種類や量を変えても安定した
微粒子として調製できるのは粒子径が２００人程度が限
界であった。However, even if the concentration of the precious metal solution, the amount of protective colloid, and the type and amount of other polymeric surfactants were changed, stable fine particles could only be prepared at a particle size of about 200 particles. .
（発明の目的）
本発明は、上記の欠点を解決するために成されたもので
、貴金属の微粒子として粒子径が３０〜２００人で粒子
径の範囲がせまく安定したのものを調製する方法を提供
することを目的とする。(Object of the Invention) The present invention has been made to solve the above-mentioned drawbacks, and provides a method for preparing fine particles of precious metals having a particle size of 30 to 200 particles and having a narrow particle size range. The purpose is to provide.
（問題点を解決するための手段）
本発明は、貴金属含有溶液と還元剤を含む溶液を反応さ
せて、貴金属の微粒子を調製するに際し、貴金属含有溶
液に水溶性キチンを加えてのちに還元剤を含む溶液を加
えて反応させることを特徴とする貴金属微粒子の調製方
法で、前記水溶性キチンがキチンを脱アセチル化したも
のを含む構造であり、還元剤を含む溶液が水酸化アルカ
リを含むホルムアルデヒド溶液またはヒドラジン水和物
である。(Means for Solving the Problems) In the present invention, when preparing noble metal fine particles by reacting a noble metal-containing solution with a reducing agent-containing solution, water-soluble chitin is added to the noble metal-containing solution, and then the reducing agent is added to the noble metal-containing solution. A method for preparing noble metal fine particles characterized by adding and reacting a solution containing the water-soluble chitin, wherein the water-soluble chitin has a structure containing deacetylated chitin, and the solution containing the reducing agent is formaldehyde containing an alkali hydroxide. solution or hydrazine hydrate.
また、貴金属含有溶液中の貴金属が１種以上含有して成
る貴金属微粒子の調製方法である。The present invention also provides a method for preparing noble metal fine particles containing one or more kinds of noble metals in a noble metal-containing solution.
以下、本発明の詳細について説明する。The details of the present invention will be explained below.
本発明の貴金属含有溶液は最も一般的である塩化物の水
溶液でよく、貴金属濃度は０．１〜０．５ｇ／ｌである
ことが好ましい。The noble metal-containing solution of the present invention may be the most common aqueous chloride solution, and the noble metal concentration is preferably between 0.1 and 0.5 g/l.
上記の理由は調製した貴金属の微粒子が凝集せずまた調
製する量が経済的な範囲であるからである。The reason for the above is that the prepared noble metal fine particles do not aggregate and the amount to be prepared is within an economical range.
水溶性キチンはキチン（Ｎ−アセチルーＤ−グルコサミ
ンが約８５０連なったもの）を脱アセチル化したものを
含む構造であり、水溶性の高分子化合物として貴金属の
微粒子が安定させる効果を有するものと考えられる。Water-soluble chitin has a structure that includes deacetylated chitin (approximately 850 chains of N-acetyl-D-glucosamine), and is thought to have a stabilizing effect on fine particles of precious metals as a water-soluble polymer compound. It will be done.
上記水溶性キチンの加える量は反応させる溶液中の濃度
を０． ２〜３ｇ／Ｉ！とすることにより、貴金属の
粒子径を３０〜２００人に調製することができ、粒子径
と水溶性キチンとの関係は水溶性キチンの濃度を高くす
るに従い粒子径が小さ《なり、粒子径の分布範囲は平均
粒子径の±２０％で８０％以上のものが得られる。The amount of water-soluble chitin added is determined by adjusting the concentration of the solution in the reaction to 0. 2-3g/I! By doing so, the particle size of the precious metal can be adjusted to between 30 and 200. The relationship between the particle size and water-soluble chitin is that as the concentration of water-soluble chitin increases, the particle size becomes smaller. A distribution range of 80% or more can be obtained within ±20% of the average particle diameter.
還元剤を含む溶液は水酸化アルカリとして水酸化ナトリ
ウムまたは水酸化カリウムを加えてあるホルムアルデヒ
ド３％前後の水溶液またはヒドラジン水和物の４％前後
で、水酸化アルカリを加えるのは貴金属をホルムアルデ
ヒドで還元させやすい反応条件とするためである。The solution containing the reducing agent is an aqueous solution of around 3% formaldehyde to which sodium hydroxide or potassium hydroxide is added as an alkali hydroxide, or an aqueous solution of around 4% hydrazine hydrate.Adding an alkali hydroxide is used to reduce noble metals with formaldehyde. This is to provide reaction conditions that facilitate the reaction.
また、還元剤としてのホルムアルデヒドおよびヒドラジ
ンの加える量は貴金属に対して２倍当量となるようにす
るのが好ましく、過剰に加えると経済的でないばかりか
貴金属の微粒子の粒子径の分布が広《なってしまう等の
問題が生ずる。In addition, it is preferable that the amount of formaldehyde and hydrazine added as reducing agents is twice the equivalent of the precious metal; if they are added in excess, it is not only uneconomical but also causes a wide distribution of the particle size of the fine particles of the precious metal. This may cause problems such as
尚、反応させる溶液のそれぞれの液温は室温でよ《、貴
金属含有溶液中に貴金属が２種以上含ませて操作すると
貴金属合金微粒子として調製させることができるもので
ある。Note that the temperature of each of the solutions to be reacted should be room temperature.If the noble metal-containing solution is operated with two or more noble metals contained therein, noble metal alloy fine particles can be prepared.
以下、本発明の実施例について記載するが、該実施例は
本発明を限定するものではない。Examples of the present invention will be described below, but the examples do not limit the present invention.
（実施例ｌ）
塩化金酸溶液（Ａｕｌ２．５ミリモル／Ｉ！）をｌｍｌ
ナスフラスコに取り、水溶性キチン（０．５ｇを水に溶
解して５０ｍｌにメスアップしたもの）を５ｍｌ加え、
水を加えて全量を５０ｍｌとし、マントルヒータを用い
て還流し、沸騰後ホルムアルデヒド溶液（ＩＮ−ＫＯＨ
を５ｍＡ’十水を２０Ｊ＋３５％ホルムアルデヒドを２
． ５ｍＡ’）を１ｍｌ加えて攪拌して反応させ直ち
に氷冷したところ、溶液は赤紫に変化して金の微粒子が
生成した。(Example 1) lml of chloroauric acid solution (Aul2.5 mmol/I!)
Transfer to an eggplant flask, add 5 ml of water-soluble chitin (0.5 g dissolved in water and volume up to 50 ml),
Add water to bring the total volume to 50 ml, reflux using a mantle heater, and after boiling formaldehyde solution (IN-KOH)
5 mA' 10 water 20 J + 35% formaldehyde 2
．． When 1 ml of 5 mA') was added, stirred and reacted, and immediately cooled on ice, the solution turned reddish-purple and fine gold particles were produced.
この微粒子を拡大して観察したところ、平均粒子径は３
１人で±２０％の範囲に８０％が入るもので、３０日間
凝集せずに安定していた。When we enlarged and observed these fine particles, we found that the average particle diameter was 3.
80% of the samples fell within the ±20% range for one person, and remained stable without aggregation for 30 days.
（実施例２）
塩化白金酸溶液、塩化ロジウム溶液、塩化パラジウム溶
液をそれぞれ実施例１と同様の方法で行ったところ下記
の様な結果であった。(Example 2) When a chloroplatinic acid solution, a rhodium chloride solution, and a palladium chloride solution were prepared in the same manner as in Example 1, the following results were obtained.
（実施例３）
実施例１で用いた塩化金酸溶液０． ５ｍｌと実施例
２で用いた塩化白金酸溶液０． ５−をナスフラスコ
に取り、水溶性キチン（ｏ．ｓｇを水に溶解して５０ｒ
ｎｌにメスアップしたもの）を５ｒｒ！加え、水を加え
て全量を５０ｒＩＬｌとし、マントルヒータを用いて還
流し、沸騰後ヒドラジン水和物溶液（濃度４％）をＩｎ
／加えて攪拌して反応させ直ちに水冷したところ、白金
一金合金の微粒子が生成した。(Example 3) The chloroauric acid solution used in Example 1. 5 ml and 0.0 ml of the chloroplatinic acid solution used in Example 2. Take 5- in an eggplant flask, dissolve water-soluble chitin (o.sg) in water and boil for 50r
5rr! and water to make a total volume of 50 rILl, refluxed using a mantle heater, and after boiling, the hydrazine hydrate solution (concentration 4%) was
/ When the mixture was stirred and reacted and immediately cooled with water, fine particles of platinum-gold alloy were produced.
この微粒子を拡大して観察したところ、平均粒子径は９
２人で±２０％の範囲に８０％が入るもので、３０日間
凝集せずに安定していた。When we enlarged and observed these fine particles, we found that the average particle diameter was 9.
80% of the samples fell within the ±20% range for two people, and remained stable without aggregation for 30 days.
（実施例４）
実施例１で用いた塩化金酸溶液０． ５ｒＩＬｌと実
施例２で用いた塩化パラジウム溶液０． ５１ｎｌを
ナスフラスコに取り、水溶性キチン（０．５ｇを水に溶
解して５０ｍｌにメスアップしたもの）を５ｒＩｌｌ加
え、水を加えて全量を５０ｒｒＬｌとし、マントルヒー
タを用いて還流し、沸騰後ヒドラジン水和物溶液（濃度
４％）をｌｒｎｌ加えて攪拌して反応させ直ちに氷冷し
たところ、金−パラジウム合金の微粒子が生成した。(Example 4) The chloroauric acid solution used in Example 1. 5rILl and the palladium chloride solution used in Example 2. Take 51nl in an eggplant flask, add 5rIll of water-soluble chitin (0.5g dissolved in water and make up to 50ml), add water to make a total volume of 50rrLl, reflux using a mantle heater, and after boiling. When lrnl of hydrazine hydrate solution (concentration 4%) was added, stirred and reacted, and immediately cooled on ice, fine particles of gold-palladium alloy were produced.
この微粒子を拡大して観察したところ、平均粒子径は３
６人で±２０％の範囲に８０％が入るもので、３０日間
凝集せずに安定していた。When we enlarged and observed these fine particles, we found that the average particle diameter was 3.
In 6 people, 80% of the samples fell within the range of ±20% and remained stable without aggregation for 30 days.
（実施例５）
実施例ｌで用いた塩化金酸溶液０．５ｍｌと実施例２で
用いた塩化ロジウム溶液０． ５ｍ７！をナスフラス
コに取り、水溶性キチン（０．５ｇを水に溶解して５０
ｍｌにメスアップしたもの）を５ｍＪ！加え、水を加え
て全量を５０ｍ７！とじ、マントルヒータを用いて還流
し、沸騰後ヒドラジン水和物溶液（濃度４％）をｌ一加
えて攪拌して反応させ直ちに氷冷したところ、金一ロジ
ウム合金の微粒子が生成した。(Example 5) 0.5 ml of the chloroauric acid solution used in Example 1 and 0.5 ml of the rhodium chloride solution used in Example 2. 5m7! into an eggplant flask, and add water-soluble chitin (dissolve 0.5 g in water and add 50
5 mJ! Add water to make the total volume 50m7! The mixture was closed, refluxed using a mantle heater, and after boiling, one liter of hydrazine hydrate solution (concentration 4%) was added, stirred and reacted, and immediately cooled on ice, producing fine particles of gold-rhodium alloy.
この微粒子を拡大して観察したところ、平均粒子径は８
５人で±２０％の範囲に８０％が入るもので、２０日間
凝集せずに安定していた。When the fine particles were enlarged and observed, the average particle diameter was 8.
In 5 people, 80% of the samples fell within the range of ±20% and remained stable for 20 days without aggregation.
（実施例６）
水溶性キチンの加える量を０〜５４段階的に加えた他は
実施例２のパラジウムとロジウムについて同様に操作し
てそれぞれの粒子径を測定したところ、下記のような結
果であった。(Example 6) The particle diameters of palladium and rhodium were measured in the same manner as in Example 2, except that the amount of water-soluble chitin was added stepwise from 0 to 54. The following results were obtained. there were.
（以下余白）
〔結果〕
パラジウムについては、
ロジウムについては、
（発明の効果）
本発明は、
以上の結果から明確なように、
従来
法では得られなかった３０〜２００人の貴金属微粒子の
粒子径を調製することができ、反応条件等も極めて簡便
であり、貴金属の微粒子を貴金属の特性を利用した触媒
、ペースト、あるいは薄膜形成用材料の原料等広く利用
することが期待されるものである。(Left below) [Results] For palladium, for rhodium (Effects of the invention) As is clear from the above results, the present invention has achieved a particle size of 30 to 200 precious metal fine particles that could not be obtained using conventional methods. can be prepared, and the reaction conditions are extremely simple, and it is expected that the fine particles of noble metals will be widely used as raw materials for catalysts, pastes, and materials for forming thin films that utilize the properties of noble metals.
Claims (4)
、貴金属の微粒子を調製するに際し、貴金属含有溶液に
水溶性キチンを加えたのちに還元剤を含む溶液を加えて
反応させることを特徴とする貴金属微粒子の調製方法。(1) When preparing precious metal fine particles by reacting a noble metal-containing solution with a reducing agent-containing solution, water-soluble chitin is added to the noble metal-containing solution, and then a reducing agent-containing solution is added and reacted. A method for preparing noble metal fine particles.
含む構造であることを特徴とする請求項１に記載の貴金
属微粒子の調製方法。(2) The method for preparing noble metal fine particles according to claim 1, wherein the water-soluble chitin has a structure containing deacetylated chitin.
アルデヒド溶液またはヒドラジン水和物であることを特
徴とする請求項１に記載の貴金属微粒子の調製方法。(3) The method for preparing noble metal fine particles according to claim 1, wherein the solution containing the reducing agent is a formaldehyde solution containing an alkali hydroxide or hydrazine hydrate.
る請求項１に記載の貴金属微粒子の調製方法。(4) The method for preparing noble metal fine particles according to claim 1, wherein the noble metal-containing solution contains one or more kinds of noble metals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1003490A JP2877410B2 (en) | 1990-01-19 | 1990-01-19 | Preparation method of noble metal fine particles |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1003490A JP2877410B2 (en) | 1990-01-19 | 1990-01-19 | Preparation method of noble metal fine particles |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03215606A true JPH03215606A (en) | 1991-09-20 |
| JP2877410B2 JP2877410B2 (en) | 1999-03-31 |
Family
ID=11739105
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1003490A Expired - Lifetime JP2877410B2 (en) | 1990-01-19 | 1990-01-19 | Preparation method of noble metal fine particles |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2877410B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002285207A (en) * | 2001-03-23 | 2002-10-03 | Nippon Paint Co Ltd | Platinum colloidal aqueous solution, its manufacturing method, and method for supporting platinum |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4257981B2 (en) * | 2006-03-09 | 2009-04-30 | 国立大学法人九州大学 | Method for producing alloy nanoparticles |
| JP2009084700A (en) * | 2008-12-09 | 2009-04-23 | Kyushu Univ | Hydrogen storage alloy |
-
1990
- 1990-01-19 JP JP1003490A patent/JP2877410B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002285207A (en) * | 2001-03-23 | 2002-10-03 | Nippon Paint Co Ltd | Platinum colloidal aqueous solution, its manufacturing method, and method for supporting platinum |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2877410B2 (en) | 1999-03-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Khan et al. | Au (III)–CTAB reduction by ascorbic acid: Preparation and characterization of gold nanoparticles | |
| US4863510A (en) | Reduction process for preparing copper, silver, and admixed silver-palladium metal particles | |
| US8529963B2 (en) | Method for preparing dispersions of precious metal nanoparticles and for isolating such nanoparticles from said dispersions | |
| US3885955A (en) | Process for the production of gold powder | |
| JPS59120249A (en) | Preparation of noble metal catalyst | |
| US5034313A (en) | Metastable metal colloids and preparation | |
| JPH03215606A (en) | Manufacture of noble metal fine particles | |
| JPH10195505A (en) | Metallic superfine particle and production thereof | |
| CN108568519A (en) | A kind of preparation method and application of argentum nano composite material | |
| JPH10265812A (en) | Production of superfine silver particle | |
| JPH0557324B2 (en) | ||
| JP2684413B2 (en) | Method for preparing ultrafine gold particles | |
| JPH06122905A (en) | Production of globular fine silver powder | |
| Temgire et al. | Gamma radiolytic formation of alloyed Ag-Pt nanocolloids | |
| JP2002239372A (en) | Colloidal metal solution | |
| JPH01159056A (en) | Production of hydroxylammonium salt and catalyst thereof | |
| JPS62121640A (en) | Preparation of noble metal organosol | |
| JP3122148B2 (en) | Method for producing palladium powder | |
| JPH04254504A (en) | Preparation of superfine noble metal particle | |
| TW583029B (en) | The process for preparing noble metal nanoparticles | |
| JPS5843239A (en) | Manufacture of colloid carrying type solid catalyst | |
| Wu et al. | Influence of water on room-temperature preparation of silver nanoparticles using poly (vinyl pyrrolidone) as reducing agent | |
| JPS61107937A (en) | Preparation of noble metal organosol | |
| JPS60246226A (en) | Preparation of palladium organosol | |
| JP2661243B2 (en) | Method for producing metal-coated fine particles |