1.

Which of the following is an example of bottom-up approach for the preparation of nanomaterials ?(a) Ball-milling method(b) Sol-gel method(c) Electro deposition(d) Molecular self-assembly

Answer»

Correct option is (B) Sol-gel method

Bottom up approach refers to the build up of a material from bottom, atom by atom, molecules by molecule.

Many of these techniques are still under development aa are just beginning to be used for commercial production of nano powders.

sol- gel synthesis



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