The role of colloidal stability in the formation of gold sols

Journal Article · Fri Oct 15 04:00:00 EDT 1993 · Journal of Colloid and Interface Science; (United States)

DOI:https://doi.org/10.1006/jcis.1993.1430· OSTI ID:5846492

Biggs, S; Grieser, F ^[1]; Chow, M K; Zukoski, C F ^[2]

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1. Univ. of Melbourne, Parkville, Victoria (Australia). School of Chemistry
2. Univ. of Illinois, Urbana, IL (United States). School of Chemical Engineering

The stability of gold sols, formed by the reduction of AuCl[sub 4][sup [minus]] with trisodium citrate, was examined as a function of reaction time using optical spectroscopy and direct force measurements performed with an atomic force microscope (AFM). The competitive adsorption of the ions and the effects of each species on the dispersion forces for the sol are examined. Analysis of the data suggests that the AuCl[sub 4][sup [minus]] is adsorbed preferentially at the gold/water interface but, due to its lower charge density, is not as efficient a dispersion agent as the trivalent citrate anion. The use of raw force data from the AFM to attain a qualitative understanding of colloidal phenomena is also demonstrated with this study.

• DOE Contract Number: AC02-76ER01198
• OSTI ID: 5846492
• Journal Information: Journal of Colloid and Interface Science; (United States), Journal Name: Journal of Colloid and Interface Science; (United States) Vol. 160:2; ISSN 0021-9797; ISSN JCISA5
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ADSORPTION
CHLORIDES
CHLORINE COMPOUNDS
COLLOIDS
DISPERSIONS
ELEMENTS
GOLD
GOLD CHLORIDES
GOLD COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
METALS
MICROSCOPY
SOLS
SORPTION
SPECTROSCOPY
STABILITY
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS