Question

What is Bredig's arc method?

Answer 1

The Bredig's arc method:

• It is also referred to as electrical disintegration.
• Both dispersion and condensation take place in this method.
• This method is useful in the preparation of colloidal sol of silver (Ag), gold (Au) or platinum (Pt).

Method:

• Metal electrodes are dipped in the dispersion medium and an electric arc is struck between these electrodes.
• By doing so, intense heat is generated that helps in the vaporization of metal.
• Then, condensation of metal takes place and results in the formation of particles having colloidal size.