PROCESS FOR PRODUCTION OF COLLOIDAL GOLD AND COLLOIDAL GOLD

WIPO Patent Application WO/2007/142082

A1

Disclosed is a process for producing a colloidal gold having an intended particle size, a sharp particle size distribution, and a uniform, perfectly spherical shape. Specifically, disclosed is a process for producing a colloidal gold, comprising: a nucleation step for adding a first reducing agent to a solution of a first gold salt to form a nuclear colloid particle; and a growth step for adding a second gold salt and a second reducing agent to the resulting nuclear colloid particle solution to grow the nuclear colloid, wherein the growth step is conducted at least once, a citrate salt is used as the first reducing agent, an ascorbate salt is used as the second reducing agent, and the addition of the ascorbate salt in the growth step is conducted simultaneously with the addition of the second gold salt. The process enables to produce a colloidal gold having a sharp particle size distribution and a uniform, perfectly spherical shape.

TANIUCHI JUNICHI (JP)
NAKAGAWA HIROFUMI (JP)
OKAMOTO KOJI (JP)

PCT/JP2007/060919

December 13, 2007

May 29, 2007

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TANAKA PRECIOUS METAL IND (JP)
TANIUCHI JUNICHI (JP)
NAKAGAWA HIROFUMI (JP)
OKAMOTO KOJI (JP)

B22F9/24; B01J13/00; B22F1/0545

JPS63307208A	1988-12-14
JPH10317022A	1998-12-02
JP3072683B2	2000-07-31
JP2834400B2	1998-12-09
JP2902954B2	1999-06-07
US20030116228A1	2003-06-26

G. FRENS, NATURE PHYSICAL SCIENCE, vol. 20, 1973, pages 241
J. WAGNER ET AL., CHEMICAL ENGINEERING JOURNAL, vol. 101, 2004, pages 251 - 260
See also references of EP 2027956A4

TANAKA AND OKAZAKI (30-10 Hongo 3-chome, Bunkyo-k, Tokyo 33, JP)

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