Preparation Of Colloidal Gold Research Articles

Control of Particle Size in the Preparation of Colloidal Gold

ABSTRACT The preparation of colloidal gold is a subject of practical interest in many technological fields. It is generally accomplished by reduction of HAuCl4 solution with sodium citrate which is known to be influenced by several factors such as temperature and reactants concentration. In the course of the present investigation, the rate of addition of sodium citrate was observed to play a very important role on the particle size distribution. This aspect has not, to our knowledge, been investigated and reported previously. The studies undertaken including UV/visible absorption spectrophotometry, light scattering, and transmission electron microscopy (TEM) showed that the higher the rate of addition of sodium citrate, the smaller is the mean particle size and the narrower is the diameter of the gold particles produced.

Preparation of colloidal gold.

Colloidal gold probes have become widely used for immunocytochemical staining at the electron microscopic level. Gold sols are producing by boiling a solution of tetrachloroauric acid with a reducing agent. The type of reducing agent and the concentration of components determine the final particle size. Gold sols that have a particle size ranging from 2 to 40 nm can be made in the laboratory, depending on the type and concentration of the reducing agent. This chapter details methods for producing various sizes of gold. The methods are relatively simple and very reproducible from batch to batch.

Preparation of colloidal gold by photoreduction of tetracyanoaurate(1-)-cationic surfactant complexes

Preparation of colloidal gold by photoreduction of tetracyanoaurate(1-)-cationic surfactant complexes

Gold based glass and enamel colours

The most effective means of producing the highest quality enamel colours from pink to maroon for glass and ceramics is still based upon the preparation of colloidal gold and stannous hydroxide known as Purple of Cassius. This was, however, known for more than twenty-five years before an account of it was published by Cassius in 1685. Its constitution remained a lively source of argument by chemists until finally clarified by Richard Zsigmondy early in this century.

An observation on the preparation of colloidal gold

An observation on the preparation of colloidal gold

Colloidal gold solution

1. A slight modification of Zsigmondy's method of preparation of colloidal gold is described, wherein conductivity, instead of triply distilled water is used, in addition to an increased amount of alkali. 2. The titration of the solution is accomplished with phenal red as an indicator, and thePh is determined with permanent inorganic standards.