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Title: Method for the preparation of metal colloids in inverse micelles and product preferred by the method

Abstract

A method is provided for preparing catalytic elemental metal colloidal particles (e.g. gold, palladium, silver, rhodium, iridium, nickel, iron, platinum, molybdenum) or colloidal alloy particles (silver/iridium or platinum/gold). A homogeneous inverse micelle solution of a metal salt is first formed in a metal-salt solvent comprised of a surfactant (e.g. a nonionic or cationic surfactant) and an organic solvent. The size and number of inverse micelles is controlled by the proportions of the surfactant and the solvent. Then, the metal salt is reduced (by chemical reduction or by a pulsed or continuous wave UV laser) to colloidal particles of elemental metal. After their formation, the colloidal metal particles can be stabilized by reaction with materials that permanently add surface stabilizing groups to the surface of the colloidal metal particles. The sizes of the colloidal elemental metal particles and their size distribution is determined by the size and number of the inverse micelles. A second salt can be added with further reduction to form the colloidal alloy particles. After the colloidal elemental metal particles are formed, the homogeneous solution distributes to two phases, one phase rich in colloidal elemental metal particles and the other phase rich in surfactant. The colloidal elemental metalmore » particles from one phase can be dried to form a powder useful as a catalyst. Surfactant can be recovered and recycled from the phase rich in surfactant.« less

Inventors:
 [1]
  1. Albuquerque, NM
Publication Date:
Research Org.:
AT&T
OSTI Identifier:
868468
Patent Number(s):
US 5147841
Assignee:
United States of America as represented by United States (Washington, DC)
DOE Contract Number:  
AC04-76DP00789
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
method; preparation; metal; colloids; inverse; micelles; product; preferred; provided; preparing; catalytic; elemental; colloidal; particles; gold; palladium; silver; rhodium; iridium; nickel; iron; platinum; molybdenum; alloy; homogeneous; micelle; solution; salt; formed; metal-salt; solvent; comprised; surfactant; nonionic; cationic; organic; size; controlled; proportions; reduced; chemical; reduction; pulsed; continuous; wave; laser; formation; stabilized; reaction; materials; permanently; add; surface; stabilizing; sizes; distribution; determined; added; form; distributes; phases; phase; rich; dried; powder; useful; catalyst; recovered; recycled; metal particle; colloidal particles; colloidal metal; continuous wave; size distribution; metal particles; organic solvent; metal salt; alloy particles; elemental metal; cationic surfactant; chemical reduction; inverse micelle; catalytic element; metal colloids; micelle sol; alloy particle; solvent comprise; /502/516/

Citation Formats

Wilcoxon, Jess P. Method for the preparation of metal colloids in inverse micelles and product preferred by the method. United States: N. p., 1992. Web.
Wilcoxon, Jess P. Method for the preparation of metal colloids in inverse micelles and product preferred by the method. United States.
Wilcoxon, Jess P. Wed . "Method for the preparation of metal colloids in inverse micelles and product preferred by the method". United States. https://www.osti.gov/servlets/purl/868468.
@article{osti_868468,
title = {Method for the preparation of metal colloids in inverse micelles and product preferred by the method},
author = {Wilcoxon, Jess P},
abstractNote = {A method is provided for preparing catalytic elemental metal colloidal particles (e.g. gold, palladium, silver, rhodium, iridium, nickel, iron, platinum, molybdenum) or colloidal alloy particles (silver/iridium or platinum/gold). A homogeneous inverse micelle solution of a metal salt is first formed in a metal-salt solvent comprised of a surfactant (e.g. a nonionic or cationic surfactant) and an organic solvent. The size and number of inverse micelles is controlled by the proportions of the surfactant and the solvent. Then, the metal salt is reduced (by chemical reduction or by a pulsed or continuous wave UV laser) to colloidal particles of elemental metal. After their formation, the colloidal metal particles can be stabilized by reaction with materials that permanently add surface stabilizing groups to the surface of the colloidal metal particles. The sizes of the colloidal elemental metal particles and their size distribution is determined by the size and number of the inverse micelles. A second salt can be added with further reduction to form the colloidal alloy particles. After the colloidal elemental metal particles are formed, the homogeneous solution distributes to two phases, one phase rich in colloidal elemental metal particles and the other phase rich in surfactant. The colloidal elemental metal particles from one phase can be dried to form a powder useful as a catalyst. Surfactant can be recovered and recycled from the phase rich in surfactant.},
doi = {},
url = {https://www.osti.gov/biblio/868468}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1992},
month = {1}
}

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