Question

What is the typical characteristic length scale range for nanomaterials?

• A. 1–100 nm
• B. 1–1000 nm
• C. 100–1000 nm
• D. 0.1–10 mm

Hint:

Nanomaterial size range → {1 nm to 100 nm}

Answer 1

The Correct Option is A

Understanding the Question: The question asks for the officially recognized size range that defines a material as a "nanomaterial."
Key Formulas and approach: Nanotechnology generally deals with structures where at least one dimension is measured in nanometers ($10^{-9}$ m). The standard definition is based on the range where quantum effects start to dominate.
Detailed Solution:
Step 1: Defining the Nanoscale. Scientific organizations like ISO and the NNI define the nanoscale as the range from 1 nm up to 100 nm.
Step 2: Identifying the transition point. At scales larger than 100 nm, materials usually exhibit "bulk" properties. Below 100 nm, surface-to-volume ratios become extremely high, changing the material's behavior.
Conclusion: The characteristic range for nanomaterials is 1–100 nm.