Explain top - down approach in synthesis of nano material in detail.

Dear Student

Nano-particles are prepared using the two methods as: Top-down approach and Bottom-up approach. 

In the top-down approach the bulk material is "cut away" or "broken down" into nano-sized particles or nano-particles. In other words, the top-down approach is one where the building blocks are removed from the substrate to form the nano-particle. 


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