Farrokhfar Valizadeh Harzand

It's very simple. Use of a polarized laser in conjunction with the appropriate detector improves the signal-to-noise of the system by not 'seeing' extraneous noise.

DDLS can help discern both translational and rotational diffusion of rod-like particles. See for example:

Lehner, D.; Lindner, H.; Glatter, O. Determination of the Translational and Rotational Diffusion Coefficients of Rodlike Particles Using Depolarized Dynamic Light Scattering. Langmuir 2000, 16 (4), 1689–1695. https://doi.org/10.1021/la9910273.

Alan F Rawle

John Francis Miller

Hi

I thought it depended on the solvent.

Thank you very much for your information.

The overall amount of light scattered and the ratio of depolarized to polarized intensity can depend on the solvent. However for typical dynamic light scattering that should not be relevant, since the signal from the particles should be much stronger than from the solvent alone.

Ulf Nobbmann

Thank you for your helpful answer.

If you have more articles or references, I will be happy if you share them with me.

Hello Farrokhfar Valizadeh Harzand , here is a link to a blog you might find of interest https://www.materials-talks.com/blog/2020/12/15/polarizers-huh-what-are-they-there-for/