Question

Nanostructured materials have crystallites ranging in the size of ____________

• A. 1 – 100 nm
• B. 150 – 300 nm
• C. 350 – 500 nm
• D. 500 – 900 nm

Hint:

Nanomaterials have enhanced mechanical strength, electrical properties, and catalytic activity due to their large surface area and quantum effects.

Answer 1

The Correct Option is A

Nanostructured materials are materials that have structural features on the nanometer scale, significantly altering their mechanical, electrical, and optical properties.
Step 1: Understanding the Size Range of Nanostructured Materials - By definition, nanomaterials have at least one dimension in the 1–100 nm range. - Materials with grain sizes in this range exhibit unique properties such as quantum effects, high surface area, and enhanced mechanical strength.


Step 2: Evaluating the Options - Option (A) - Correct: The 1–100 nm range correctly defines nanostructured materials.
- Option (B) - Incorrect: 150–300 nm is outside the nanometer scale and falls into the microstructure regime.
- Option (C) - Incorrect: 350–500 nm is significantly larger than the nanoscale range.
- Option (D) - Incorrect: 500–900 nm corresponds to larger microcrystalline materials.


Step 3: Conclusion Since nanostructured materials have crystallites ranging in size from 1 to 100 nm, the correct answer is option (A).