Question

Which of the following techniques is used to determine particle sizes in the sub-nanometer range?

• A. Sedimentation
• B. Dynamic light scattering
• C. X-ray radiography
• D. Sieving

Hint:

Dynamic light scattering is widely used for characterizing nanoparticles in colloidal solutions, as it provides accurate size distribution in the sub-nanometer range.

Answer 1

The Correct Option is B

Dynamic light scattering (DLS) is a technique used to measure the size of particles in suspension by analyzing the pattern of light scattered by the particles. DLS is particularly effective for sub-nanometer and nanoparticle size ranges, as it can accurately measure particles based on their motion in a fluid medium. The technique is sensitive enough to resolve sizes as small as a few nanometers.
Other techniques like sedimentation, X-ray radiography, and sieving are typically used for larger particle sizes or have limitations in the sub-nanometer range. Therefore, DLS is the best choice for determining particle sizes in the sub-nanometer range.