Question

Which of the following can be used to prepare nano-powder and nano-particles?

(a) Sol-gel technique

(b) Plasma arching

(c) Chemical vapour deposition

(d) Electro deposition

I had been asked this question during an interview.

I would like to ask this question from Metallic Glasses topic in chapter Advanced Engineering Materials of Engineering Physics II

Answer 1

The correct answer is (a) Sol-gel technique

The explanation is: Sol-gel process is based on the hydrolysis of liquid precursors and the formation of colloidal solutions. In every other technique, either only nano-powder or nano-particles can be formed. Only in sol-gel technique both nano-powder and nano-particles can be formed.