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Which of the following is used to make both nano-particles and nano-powders?

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Which of the following is used to make both nano-particles and nano-powders?

(a) Chemical vapour deposition

(b) Sol-gel technique

(c) Plasma arching

(d) Electro deposition

I got this question during an internship interview.

I would like to ask this question from Nano Phase Materials in chapter Advanced Engineering Materials of Engineering Physics II

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Correct option is (b) Sol-gel technique

The best I can explain: Sol-gel technique is based on the hydrolysis of liquid precursors and the formation of colloidal solutions. Only this method can be used for the preparation of nano-particles and nano-powders.

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