Question

Which method is used for the preparation of metal sols?

Answer 1

Bredig's arc:

• Metal electrodes are formed, submerged in a dispersion liquid, and then struck by an electric arc to create metal sols.
• This process involves dispersion and condensation.
• Making colloidal solutions of metals like gold, silver, and platinum is possible using Bredig's arc method.
• This technique makes use of both condensation and dispersion.
• An arc is created between electrodes beneath the surface of water that contains some stabilizing agent, such as traces of Potassium hydroxide $\left(\mathrm{KOH}\right)$.
• Sol-gel technique may be used to create fibers, microspheres, thin films, tiny powders, and monoliths.
• Due to its adaptability, sol-gel technology has exclusive access to low-temperature process routines and multi-component oxide systems.

Final Answer:

Bredig's arc is a method used for the preparation of metal sols.