Bredig's arc method

Bredig's arc method is a method of preparation of colloidal solution, of metals such as gold, silver or platinum.

This method consists of both dispersion and condensation. An arc is struck between electrodes, under the surface of water containing some stabilizing agent such as traces of KOH (potassium hydroxide). The intense heat of the arc vaporizes some of the metal which then condenses under cold water. The water is kept cold as an ice bath. The Colloidal particle prepared is stabilised by adding a small amount of KOH to it.

This method is not suitable when the dispersion medium is an organic liquid as considerable charring occurs.

References

This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.