Question

Which method is used for the preparation of metal sols?

Answer 1

Hint :Sol is the liquid state of a colloid solution. A colloidal solution with a solid as the dispersed phase and a liquid as the dispersion medium is known as a Solid Sol. The dispersed medium and dispersion phase are both liquid in a liquid Sol. A liquid is dispersed in a Gaseous Dispersion medium in an Aerosol.

Complete Step By Step Answer:
Metal sols are made by forming electrodes out of metals, immersing them in dispersion liquid, and striking an electric arc. Dispersion and condensation are involved in this process.
Bredig's arc method is a technique for making colloidal solutions of metals like gold, silver, and platinum. Both dispersion and condensation are used in this process. Under the surface of water containing some stabilizing substance, such as traces of $ KOH $ , an arc is struck between electrodes (potassium hydroxide).
Fibers, microspheres, thin films, small powders, and monoliths can all be made using sol gel technology. Protective coatings, catalysts, piezoelectric devices, waveguides, lenses, high-strength ceramics, superconductors, nanoparticle production, and insulating materials are some of the applications for sol gel technology. Sol gel technology's versatility gives it exclusive access to multi-component oxide systems and low-temperature process regimens.

Note :
By preferential adsorption of positive or negative ions, the sol particles acquire positive or negative charge. Metal hydroxides make up the majority of positively charged sols, while metal sols and metal sulphide sols make up the majority of negatively charged sols. Negatively charged solutions include gold sol and starch sol.