Q1. Attempt the following sub-questions.
- Top-down synthesis reduces bulk materials into nanoparticles.
- Ball milling uses mechanical force; it's scalable but can cause contamination and broad size distribution.
- Lithography (e.g., EBL) patterns materials precisely; it's high-resolution but costly and slow.
- HRTEM transmits electrons through a thin sample to image atomic structures.
Answer: Nanoscience often employs 'top-down' synthesis approaches, which involve reducing larger bulk materials into nano-sized structures. These methods typically start with macroscopic objects and use various techniques like mechanical force or patterning to achieve nanometer dimensions. Two common examples are ball milling and lithography, each with distinct principles and applications. Ball milling is a mechanical attrition method where larger materials are subjected to high-energy collisions from ...