1.

Which of the following is an example of top-down approach for the preparation of nanomaterials ?(a) Gas phase agglomeration(b) Sol-gel method(c) Molecular beam epitaxy(d) Molecular self-assembly

Answer»

Correct option is (A) Gas phase agglomeration

Top down approach involving the breaking down of the bulk material into nanosized structure on particles.

Example of such techniques are high energy wet ball milling electron beem lithography gas phase condensation.



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