Question

Which technique is used to determine the particle size?

• A. Dynamic Light scattering
• B. Xray Diffraction
• C. Vibrational Spectroscopy
• D. Nuclear Magnetic Resonance

Hint:

For particle size analysis in the nano-range, Dynamic Light Scattering (DLS) is the most widely used and reliable technique.

Answer 1

The Correct Option is A

Step 1: Understanding the Techniques
- Dynamic Light Scattering (DLS) is widely used for determining the particle size, especially for nanoparticles and colloidal suspensions.
- DLS works by measuring the intensity fluctuation of scattered light caused by the Brownian motion of particles.

Step 2: Techniques Overview
- Xray Diffraction (XRD): Provides information about the crystalline structure but is less effective for determining particle size, particularly in the nanometer range.
- Vibrational Spectroscopy: Primarily used to analyze molecular vibrations and bonds, not particle size.
- Nuclear Magnetic Resonance (NMR): Used for structure elucidation and molecular dynamics but does not provide direct information on particle size.

Step 3: Conclusion
The technique used to determine particle size most effectively is Dynamic Light Scattering (DLS).